Changelog

Grafana Mimir - main / unreleased

Grafana Mimir

[CHANGE] Compactor: delete source and output blocks from local disk on compaction failed, to reduce likelihood that subsequent compactions fail because of no space left on disk. #2261
[CHANGE] Ruler: Remove unused CLI flags -ruler.search-pending-for and -ruler.flush-period (and their respective YAML config options). #2288
[CHANGE] Successful gRPC requests are no longer logged (only affects internal API calls). #2309
[CHANGE] Add new -*.consul.cas-retry-delay flags. They have a default value of 1s, while previously there was no delay between retries. #2309
[ENHANCEMENT] Alertmanager: Allow the HTTP proxy_url configuration option in the receiver's configuration. #2317
[ENHANCEMENT] ring: optimize shuffle-shard computation when lookback is used, and all instances have registered timestamp within the lookback window. In that case we can immediately return origial ring, because we would select all instances anyway. #2309
[ENHANCEMENT] Memberlist: added experimental memberlist cluster label support via -memberlist.cluster-label and -memberlist.cluster-label-verification-disabled CLI flags (and their respective YAML config options). #2354
[ENHANCEMENT] Object storage can now be configured for all components using the common YAML config option key (or -common.storage.* CLI flags). #2330
[BUGFIX] Compactor: log the actual error on compaction failed. #2261
[BUGFIX] Alertmanager: restore state from storage even when running a single replica. #2293
[BUGFIX] Ruler: do not block "List Prometheus rules" API endpoint while synching rules. #2289

Mixin

[CHANGE] Dashboards: "Slow Queries" dashboard no longer works with versions older than Grafana 9.0. #2223
[ENHANCEMENT] Dashboards: added missed rule evaluations to the "Evaluations per second" panel in the "Mimir / Ruler" dashboard. #2314
[ENHANCEMENT] Dashboards: add k8s resource requests to CPU and memory panels. #2346
[BUGFIX] Dashboards: fixed unit of latency panels in the "Mimir / Ruler" dashboard. #2312
[BUGFIX] Dashboards: fixed "Intervals per query" panel in the "Mimir / Queries" dashboard. #2308
[BUGFIX] Dashboards: Make "Slow Queries" dashboard works with Grafana 9.0. #2223

Jsonnet

[FEATURE] Memberlist: added support for experimental memberlist cluster label, through the jsonnet configuration options memberlist_cluster_label and memberlist_cluster_label_verification_disabled. #2349

Mimirtool

Mimir Continuous Test

Documentation

2.2.0-rc.0

Grafana Mimir

[CHANGE] Increased default configuration for -server.grpc-max-recv-msg-size-bytes and -server.grpc-max-send-msg-size-bytes from 4MB to 100MB. #1884
[CHANGE] Default values have changed for the following settings. This improves query performance for recent data (within 12h) by only reading from ingesters: #1909 #1921
- -blocks-storage.bucket-store.ignore-blocks-within now defaults to 10h (previously 0)
- -querier.query-store-after now defaults to 12h (previously 0)
[CHANGE] Alertmanager: removed support for migrating local files from Cortex 1.8 or earlier. Related to original Cortex PR cortexproject/cortex#3910. #2253
[CHANGE] The following settings are now classified as advanced because the defaults should work for most users and tuning them requires in-depth knowledge of how the read path works: #1929
- -querier.query-ingesters-within
- -querier.query-store-after
[CHANGE] Config flag category overrides can be set dynamically at runtime. #1934
[CHANGE] Ingester: deprecated -ingester.ring.join-after. Mimir now behaves as this setting is always set to 0s. This configuration option will be removed in Mimir 2.4.0. #1965
[CHANGE] Blocks uploaded by ingester no longer contain __org_id__ label. Compactor now ignores this label and will compact blocks with and without this label together. mimirconvert tool will remove the label from blocks as "unknown" label. #1972
[CHANGE] Querier: deprecated -querier.shuffle-sharding-ingesters-lookback-period, instead adding -querier.shuffle-sharding-ingesters-enabled to enable or disable shuffle sharding on the read path. The value of -querier.query-ingesters-within is now used internally for shuffle sharding lookback. #2110
[CHANGE] Memberlist: -memberlist.abort-if-join-fails now defaults to false. Previously it defaulted to true. #2168
[CHANGE] Ruler: /api/v1/rules* and /prometheus/rules* configuration endpoints are removed. Use /prometheus/config/v1/rules*. #2182
[CHANGE] Ingester: -ingester.exemplars-update-period has been renamed to -ingester.tsdb-config-update-period. You can use it to update multiple, per-tenant TSDB configurations. #2187
[FEATURE] Ingester: (Experimental) Add the ability to ingest out-of-order samples up to an allowed limit. If you enable this feature, it requires additional memory and disk space. This feature also enables a write-behind log, which might lead to longer ingester-start replays. When this feature is disabled, there is no overhead on memory, disk space, or startup times. #2187
- -ingester.out-of-order-time-window, as duration string, allows you to set how back in time a sample can be. The default is 0s, where s is seconds.
- cortex_ingester_tsdb_out_of_order_samples_appended_total metric tracks the total number of out-of-order samples ingested by the ingester.
- cortex_discarded_samples_total has a new label reason="sample-too-old", when the -ingester.out-of-order-time-window flag is greater than zero. The label tracks the number of samples that were discarded for being too old; they were out of order, but beyond the time window allowed.
[ENHANCEMENT] Distributor: Added limit to prevent tenants from sending excessive number of requests: #1843
- The following CLI flags (and their respective YAML config options) have been added:
  - -distributor.request-rate-limit
  - -distributor.request-burst-limit
- The following metric is exposed to tell how many requests have been rejected:
  - cortex_discarded_requests_total
[ENHANCEMENT] Store-gateway: Add the experimental ability to run requests in a dedicated OS thread pool. This feature can be configured using -store-gateway.thread-pool-size and is disabled by default. Replaces the ability to run index header operations in a dedicated thread pool. #1660 #1812
[ENHANCEMENT] Improved error messages to make them easier to understand; each now have a unique, global identifier that you can use to look up in the runbooks for more information. #1907 #1919 #1888 #1939 #1984 #2009 #2056 #2066 #2104 #2150 #2234
[ENHANCEMENT] Memberlist KV: incoming messages are now processed on per-key goroutine. This may reduce loss of "maintanance" packets in busy memberlist installations, but use more CPU. New memberlist_client_received_broadcasts_dropped_total counter tracks number of dropped per-key messages. #1912
[ENHANCEMENT] Blocks Storage, Alertmanager, Ruler: add support a prefix to the bucket store (*_storage.storage_prefix). This enables using the same bucket for the three components. #1686 #1951
[ENHANCEMENT] Upgrade Docker base images to alpine:3.16.0. #2028
[ENHANCEMENT] Store-gateway: Add experimental configuration option for the store-gateway to attempt to pre-populate the file system cache when memory-mapping index-header files. Enabled with -blocks-storage.bucket-store.index-header.map-populate-enabled=true. Note this flag only has an effect when running on Linux. #2019 #2054
[ENHANCEMENT] Chunk Mapper: reduce memory usage of async chunk mapper. #2043
[ENHANCEMENT] Ingester: reduce sleep time when reading WAL. #2098
[ENHANCEMENT] Compactor: Run sanity check on blocks storage configuration at startup. #2144
[ENHANCEMENT] Compactor: Add HTTP API for uploading TSDB blocks. Enabled with -compactor.block-upload-enabled. #1694 #2126
[ENHANCEMENT] Ingester: Enable querying overlapping blocks by default. #2187
[ENHANCEMENT] Distributor: Auto-forget unhealthy distributors after ten failed ring heartbeats. #2154
[ENHANCEMENT] Distributor: Add new metric cortex_distributor_forward_errors_total for error codes resulting from forwarding requests. #2077
[ENHANCEMENT] /ready endpoint now returns and logs detailed services information. #2055
[ENHANCEMENT] Memcached client: Reduce number of connections required to fetch cached keys from memcached. #1920
[ENHANCEMENT] Improved error message returned when -querier.query-store-after validation fails. #1914
[BUGFIX] Fix regexp parsing panic for regexp label matchers with start/end quantifiers. #1883
[BUGFIX] Ingester: fixed deceiving error log "failed to update cached shipped blocks after shipper initialisation", occurring for each new tenant in the ingester. #1893
[BUGFIX] Ring: fix bug where instances may appear unhealthy in the hash ring web UI even though they are not. #1933
[BUGFIX] API: gzip is now enforced when identity encoding is explicitly rejected. #1864
[BUGFIX] Fix panic at startup when Mimir is running in monolithic mode and query sharding is enabled. #2036
[BUGFIX] Ruler: report cortex_ruler_queries_failed_total metric for any remote query error except 4xx when remote operational mode is enabled. #2053 #2143
[BUGFIX] Ingester: fix slow rollout when using -ingester.ring.unregister-on-shutdown=false with long -ingester.ring.heartbeat-period. #2085
[BUGFIX] Ruler: add timeout for remote rule evaluation queries to prevent rule group evaluations getting stuck indefinitely. The duration is configurable with -querier.timeout (default 2m). #2090 #2222
[BUGFIX] Limits: Active series custom tracker configuration has been named back from active_series_custom_trackers_config to active_series_custom_trackers. For backwards compatibility both version is going to be supported for until Mimir v2.4. When both fields are specified, active_series_custom_trackers_config takes precedence over active_series_custom_trackers. #2101
[BUGFIX] Ingester: fixed the order of labels applied when incrementing the cortex_discarded_metadata_total metric. #2096
[BUGFIX] Ingester: fixed bug where retrieving metadata for a metric with multiple metadata entries would return multiple copies of a single metadata entry rather than all available entries. #2096
[BUGFIX] Distributor: canceled requests are no longer accounted as internal errors. #2157
[BUGFIX] Memberlist: Fix typo in memberlist admin UI. #2202
[BUGFIX] Ruler: fixed typo in error message when ruler failed to decode a rule group. #2151
[BUGFIX] Active series custom tracker configuration is now displayed properly on /runtime_config page. #2065

Mixin

[CHANGE] Split mimir_queries rules group into mimir_queries and mimir_ingester_queries to keep number of rules per group within the default per-tenant limit. #1885
[CHANGE] Dashboards: Expose full image tag in "Mimir / Rollout progress" dashboard's "Pod per version panel." #1932
[CHANGE] Dashboards: Disabled gateway panels by default, because most users don't have a gateway exposing the metrics expected by Mimir dashboards. You can re-enable it setting gateway_enabled: true in the mixin config and recompiling the mixin running make build-mixin. #1955
[CHANGE] Alerts: adapt MimirFrontendQueriesStuck and MimirSchedulerQueriesStuck to consider ruler query path components. #1949
[CHANGE] Alerts: Change MimirRulerTooManyFailedQueries severity to critical. #2165
[ENHANCEMENT] Dashboards: Add config option datasource_regex to customise the regular expression used to select valid datasources for Mimir dashboards. #1802
[ENHANCEMENT] Dashboards: Added "Mimir / Remote ruler reads" and "Mimir / Remote ruler reads resources" dashboards. #1911 #1937
[ENHANCEMENT] Dashboards: Make networking panels work for pods created by the mimir-distributed helm chart. #1927
[ENHANCEMENT] Alerts: Add MimirStoreGatewayNoSyncedTenants alert that fires when there is a store-gateway owning no tenants. #1882
[ENHANCEMENT] Rules: Make recording_rules_range_interval configurable for cases where Mimir metrics are scraped less often that every 30 seconds. #2118
[ENHANCEMENT] Added minimum Grafana version to mixin dashboards. #1943
[BUGFIX] Fix container_memory_usage_bytes:sum recording rule. #1865
[BUGFIX] Fix MimirGossipMembersMismatch alerts if Mimir alertmanager is activated. #1870
[BUGFIX] Fix MimirRulerMissedEvaluations to show % of missed alerts as a value between 0 and 100 instead of 0 and 1. #1895
[BUGFIX] Fix MimirCompactorHasNotUploadedBlocks alert false positive when Mimir is deployed in monolithic mode. #1902
[BUGFIX] Fix MimirGossipMembersMismatch to make it less sensitive during rollouts and fire one alert per installation, not per job. #1926
[BUGFIX] Do not trigger MimirAllocatingTooMuchMemory alerts if no container limits are supplied. #1905
[BUGFIX] Dashboards: Remove empty "Chunks per query" panel from Mimir / Queries dashboard. #1928
[BUGFIX] Dashboards: Use Grafana's $__rate_interval for rate queries in dashboards to support scrape intervals of >15s. #2011
[BUGFIX] Alerts: Make each version of MimirCompactorHasNotUploadedBlocks distinct to avoid rule evaluation failures due to duplicate series being generated. #2197
[BUGFIX] Fix MimirGossipMembersMismatch alert when using remote ruler evaluation. #2159

Jsonnet

[CHANGE] Remove use of -querier.query-store-after, -querier.shuffle-sharding-ingesters-lookback-period, -blocks-storage.bucket-store.ignore-blocks-within, and -blocks-storage.tsdb.close-idle-tsdb-timeout CLI flags since the values now match defaults. #1915 #1921
[CHANGE] Change default value for -blocks-storage.bucket-store.chunks-cache.memcached.timeout to 450ms to increase use of cached data. #2035
[CHANGE] The memberlist_ring_enabled configuration now applies to Alertmanager. #2102 #2103 #2107
[CHANGE] Default value for memberlist_ring_enabled is now true. It means that all hash rings use Memberlist as default KV store instead of Consul (previous default). #2161
[CHANGE] Configure -ingester.max-global-metadata-per-user to correspond to 20% of the configured max number of series per tenant. #2250
[CHANGE] Configure -ingester.max-global-metadata-per-metric to be 10. #2250
[CHANGE] Change _config.multi_zone_ingester_max_unavailable to 25. #2251
[FEATURE] Added querier autoscaling support. It requires KEDA installed in the Kubernetes cluster and query-scheduler enabled in the Mimir cluster. Querier autoscaler can be enabled and configure through the following options in the jsonnet config: #2013 #2023
- autoscaling_querier_enabled: true to enable autoscaling.
- autoscaling_querier_min_replicas: minimum number of querier replicas.
- autoscaling_querier_max_replicas: maximum number of querier replicas.
- autoscaling_prometheus_url: Prometheus base URL from which to scrape Mimir metrics (e.g. http://prometheus.default:9090/prometheus).
[FEATURE] Jsonnet: Add support for ruler remote evaluation mode (ruler_remote_evaluation_enabled), which deploys and uses a dedicated query path for rule evaluation. This enables the benefits of the query-frontend for rule evaluation, such as query sharding. #2073
[ENHANCEMENT] Added compactor service, that can be used to route requests directly to compactor (e.g. admin UI). #2063
[ENHANCEMENT] Added a consul_enabled configuration option to provide the ability to disable consul. It is automatically set to false when memberlist_ring_enabled is true and multikv_migration_enabled (used for migration from Consul to memberlist) is not set. #2093 #2152
[BUGFIX] Querier: Fix disabling shuffle sharding on the read path whilst keeping it enabled on write path. #2164

Mimirtool

[CHANGE] mimirtool rules: --use-legacy-routes now toggles between using /prometheus/config/v1/rules (default) and /api/v1/rules (legacy) endpoints. #2182
[FEATURE] Added bearer token support for when Mimir is behind a gateway authenticating by bearer token. #2146
[BUGFIX] mimirtool analyze: Fix dashboard JSON unmarshalling errors (#1840). #1973

Mimir Continuous Test

[ENHANCEMENT] Added the -tests.smoke-test flag to run the mimir-continuous-test suite once and immediately exit. #2047 #2094

Documentation

[ENHANCEMENT] Published Grafana Mimir runbooks as part of documentation. #1970
[ENHANCEMENT] Improved ruler's "remote operational mode" documentation. #1906
[ENHANCEMENT] Recommend fast disks for ingesters and store-gateways in production tips. #1903
[ENHANCEMENT] Explain the runtime override of active series matchers. #1868
[ENHANCEMENT] Clarify "Set rule group" API specification. #1869
[ENHANCEMENT] Published Mimir jsonnet documentation. #2024
[ENHANCEMENT] Documented required scrape interval for using alerting and recording rules from Mimir jsonnet. #2147
[ENHANCEMENT] Runbooks: Mention memberlist as possible source of problems for various alerts. #2158
[ENHANCEMENT] Added step-by-step article about migrating from Consul to Memberlist KV store using jsonnet without downtime. #2166
[ENHANCEMENT] Documented /memberlist admin page. #2166
[ENHANCEMENT] Documented how to configure Grafana Mimir's ruler with Jsonnet. #2127
[ENHANCEMENT] Documented how to configure queriers’ autoscaling with Jsonnet. #2128
[ENHANCEMENT] Updated mixin building instructions in "Installing Grafana Mimir dashboards and alerts" article. #2015 #2163
[ENHANCEMENT] Fix location of "Monitoring Grafana Mimir" article in the documentation hierarchy. #2130
[ENHANCEMENT] Runbook for MimirRequestLatency was expanded with more practical advice. #1967
[BUGFIX] Fixed ruler configuration used in the getting started guide. #2052
[BUGFIX] Fixed Mimir Alertmanager datasource in Grafana used by "Play with Grafana Mimir" tutorial. #2115
[BUGFIX] Fixed typos in "Scaling out Grafana Mimir" article. #2170
[BUGFIX] Added missing ring endpoint exposed by Ingesters. #1918

2.1.0

Grafana Mimir

[CHANGE] Compactor: No longer upload debug meta files to object storage. #1257
[CHANGE] Default values have changed for the following settings: #1547
- -alertmanager.alertmanager-client.grpc-max-recv-msg-size now defaults to 100 MiB (previously was not configurable and set to 16 MiB)
- -alertmanager.alertmanager-client.grpc-max-send-msg-size now defaults to 100 MiB (previously was not configurable and set to 4 MiB)
- -alertmanager.max-recv-msg-size now defaults to 100 MiB (previously was 16 MiB)
[CHANGE] Ingester: Add user label to metrics cortex_ingester_ingested_samples_total and cortex_ingester_ingested_samples_failures_total. #1533
[CHANGE] Ingester: Changed -blocks-storage.tsdb.isolation-enabled default from true to false. The config option has also been deprecated and will be removed in 2 minor version. #1655
[CHANGE] Query-frontend: results cache keys are now versioned, this will cause cache to be re-filled when rolling out this version. #1631
[CHANGE] Store-gateway: enabled attributes in-memory cache by default. New default configuration is -blocks-storage.bucket-store.chunks-cache.attributes-in-memory-max-items=50000. #1727
[CHANGE] Compactor: Removed the metric cortex_compactor_garbage_collected_blocks_total since it duplicates cortex_compactor_blocks_marked_for_deletion_total. #1728
[CHANGE] All: Logs that used theorg_id label now use user label. #1634 #1758
[CHANGE] Alertmanager: the following metrics are not exported for a given user and integration when the metric value is zero: #1783
- cortex_alertmanager_notifications_total
- cortex_alertmanager_notifications_failed_total
- cortex_alertmanager_notification_requests_total
- cortex_alertmanager_notification_requests_failed_total
- cortex_alertmanager_notification_rate_limited_total
[CHANGE] Removed the following metrics exposed by the Mimir hash rings: #1791
- cortex_member_ring_tokens_owned
- cortex_member_ring_tokens_to_own
- cortex_ring_tokens_owned
- cortex_ring_member_ownership_percent
[CHANGE] Querier / Ruler: removed the following metrics tracking number of query requests send to each ingester. You can use cortex_request_duration_seconds_count{route=~"/cortex.Ingester/(QueryStream|QueryExemplars)"} instead. #1797
- cortex_distributor_ingester_queries_total
- cortex_distributor_ingester_query_failures_total
[CHANGE] Distributor: removed the following metrics tracking the number of requests from a distributor to ingesters: #1799
- cortex_distributor_ingester_appends_total
- cortex_distributor_ingester_append_failures_total
[CHANGE] Distributor / Ruler: deprecated -distributor.extend-writes. Now Mimir always behaves as if this setting was set to false, which we expect to be safe for every Mimir cluster setup. #1856
[FEATURE] Querier: Added support for streaming remote read. Should be noted that benefits of chunking the response are partial here, since in a typical query-frontend setup responses will be buffered until they've been completed. #1735
[FEATURE] Ruler: Allow setting evaluation_delay for each rule group via rules group configuration file. #1474
[FEATURE] Ruler: Added support for expression remote evaluation. #1536 #1818
- The following CLI flags (and their respective YAML config options) have been added:
  - -ruler.query-frontend.address
  - -ruler.query-frontend.grpc-client-config.grpc-max-recv-msg-size
  - -ruler.query-frontend.grpc-client-config.grpc-max-send-msg-size
  - -ruler.query-frontend.grpc-client-config.grpc-compression
  - -ruler.query-frontend.grpc-client-config.grpc-client-rate-limit
  - -ruler.query-frontend.grpc-client-config.grpc-client-rate-limit-burst
  - -ruler.query-frontend.grpc-client-config.backoff-on-ratelimits
  - -ruler.query-frontend.grpc-client-config.backoff-min-period
  - -ruler.query-frontend.grpc-client-config.backoff-max-period
  - -ruler.query-frontend.grpc-client-config.backoff-retries
  - -ruler.query-frontend.grpc-client-config.tls-enabled
  - -ruler.query-frontend.grpc-client-config.tls-ca-path
  - -ruler.query-frontend.grpc-client-config.tls-cert-path
  - -ruler.query-frontend.grpc-client-config.tls-key-path
  - -ruler.query-frontend.grpc-client-config.tls-server-name
  - -ruler.query-frontend.grpc-client-config.tls-insecure-skip-verify
[FEATURE] Distributor: Added the ability to forward specifics metrics to alternative remote_write API endpoints. #1052
[FEATURE] Ingester: Active series custom trackers now supports runtime tenant-specific overrides. The configuration has been moved to limit config, the ingester config has been deprecated. #1188
[ENHANCEMENT] Alertmanager API: Concurrency limit for GET requests is now configurable using -alertmanager.max-concurrent-get-requests-per-tenant. #1547
[ENHANCEMENT] Alertmanager: Added the ability to configure additional gRPC client settings for the Alertmanager distributor #1547
- -alertmanager.alertmanager-client.backoff-max-period
- -alertmanager.alertmanager-client.backoff-min-period
- -alertmanager.alertmanager-client.backoff-on-ratelimits
- -alertmanager.alertmanager-client.backoff-retries
- -alertmanager.alertmanager-client.grpc-client-rate-limit
- -alertmanager.alertmanager-client.grpc-client-rate-limit-burst
- -alertmanager.alertmanager-client.grpc-compression
- -alertmanager.alertmanager-client.grpc-max-recv-msg-size
- -alertmanager.alertmanager-client.grpc-max-send-msg-size
[ENHANCEMENT] Ruler: Add more detailed query information to ruler query stats logging. #1411
[ENHANCEMENT] Admin: Admin API now has some styling. #1482 #1549 #1821 #1824
[ENHANCEMENT] Alertmanager: added insight=true field to alertmanager dispatch logs. #1379
[ENHANCEMENT] Store-gateway: Add the experimental ability to run index header operations in a dedicated thread pool. This feature can be configured using -blocks-storage.bucket-store.index-header-thread-pool-size and is disabled by default. #1660
[ENHANCEMENT] Store-gateway: don't drop all blocks if instance finds itself as unhealthy or missing in the ring. #1806 #1823
[ENHANCEMENT] Querier: wait until inflight queries are completed when shutting down queriers. #1756 #1767
[BUGFIX] Query-frontend: do not shard queries with a subquery unless the subquery is inside a shardable aggregation function call. #1542
[BUGFIX] Query-frontend: added component=query-frontend label to results cache memcached metrics to fix a panic when Mimir is running in single binary mode and results cache is enabled. #1704
[BUGFIX] Mimir: services' status content-type is now correctly set to text/html. #1575
[BUGFIX] Multikv: Fix panic when using using runtime config to set primary KV store used by multi KV. #1587
[BUGFIX] Multikv: Fix watching for runtime config changes in multi KV store in ruler and querier. #1665
[BUGFIX] Memcached: allow to use CNAME DNS records for the memcached backend addresses. #1654
[BUGFIX] Querier: fixed temporary partial query results when shuffle sharding is enabled and hash ring backend storage is flushed / reset. #1829
[BUGFIX] Alertmanager: prevent more file traversal cases related to template names. #1833
[BUGFUX] Alertmanager: Allow usage with -alertmanager-storage.backend=local. Note that when using this storage type, the Alertmanager is not able persist state remotely, so it not recommended for production use. #1836
[BUGFIX] Alertmanager: Do not validate alertmanager configuration if it's not running. #1835

Mixin

[CHANGE] Dashboards: Remove per-user series legends from Tenants dashboard. #1605
[CHANGE] Dashboards: Show in-memory series and the per-user series limit on Tenants dashboard. #1613
[CHANGE] Dashboards: Slow-queries dashboard now uses user label from logs instead of org_id. #1634
[CHANGE] Dashboards: changed all Grafana dashboards UIDs to not conflict with Cortex ones, to let people install both while migrating from Cortex to Mimir: #1801 #1808
- Alertmanager from a76bee5913c97c918d9e56a3cc88cc28 to b0d38d318bbddd80476246d4930f9e55
- Alertmanager Resources from 68b66aed90ccab448009089544a8d6c6 to a6883fb22799ac74479c7db872451092
- Compactor from 9c408e1d55681ecb8a22c9fab46875cc to 1b3443aea86db629e6efdb7d05c53823
- Compactor Resources from df9added6f1f4332f95848cca48ebd99 to 09a5c49e9cdb2f2b24c6d184574a07fd
- Config from 61bb048ced9817b2d3e07677fb1c6290 to 5d9d0b4724c0f80d68467088ec61e003
- Object Store from d5a3a4489d57c733b5677fb55370a723 to e1324ee2a434f4158c00a9ee279d3292
- Overrides from b5c95fee2e5e7c4b5930826ff6e89a12 to 1e2c358600ac53f09faea133f811b5bb
- Queries from d9931b1054053c8b972d320774bb8f1d to b3abe8d5c040395cc36615cb4334c92d
- Reads from 8d6ba60eccc4b6eedfa329b24b1bd339 to e327503188913dc38ad571c647eef643
- Reads Networking from c0464f0d8bd026f776c9006b05910000 to 54b2a0a4748b3bd1aefa92ce5559a1c2
- Reads Resources from 2fd2cda9eea8d8af9fbc0a5960425120 to cc86fd5aa9301c6528986572ad974db9
- Rollout Progress from 7544a3a62b1be6ffd919fc990ab8ba8f to 7f0b5567d543a1698e695b530eb7f5de
- Ruler from 44d12bcb1f95661c6ab6bc946dfc3473 to 631e15d5d85afb2ca8e35d62984eeaa0
- Scaling from 88c041017b96856c9176e07cf557bdcf to 64bbad83507b7289b514725658e10352
- Slow queries from e6f3091e29d2636e3b8393447e925668 to 6089e1ce1e678788f46312a0a1e647e6
- Tenants from 35fa247ce651ba189debf33d7ae41611 to 35fa247ce651ba189debf33d7ae41611
- Top Tenants from bc6e12d4fe540e4a1785b9d3ca0ffdd9 to bc6e12d4fe540e4a1785b9d3ca0ffdd9
- Writes from 0156f6d15aa234d452a33a4f13c838e3 to 8280707b8f16e7b87b840fc1cc92d4c5
- Writes Networking from 681cd62b680b7154811fe73af55dcfd4 to 978c1cb452585c96697a238eaac7fe2d
- Writes Resources from c0464f0d8bd026f776c9006b0591bb0b to bc9160e50b52e89e0e49c840fea3d379
[FEATURE] Alerts: added the following alerts on mimir-continuous-test tool: #1676
- MimirContinuousTestNotRunningOnWrites
- MimirContinuousTestNotRunningOnReads
- MimirContinuousTestFailed
[ENHANCEMENT] Added per_cluster_label support to allow to change the label name used to differentiate between Kubernetes clusters. #1651
[ENHANCEMENT] Dashboards: Show QPS and latency of the Alertmanager Distributor. #1696
[ENHANCEMENT] Playbooks: Add Alertmanager suggestions for MimirRequestErrors and MimirRequestLatency #1702
[ENHANCEMENT] Dashboards: Allow custom datasources. #1749
[ENHANCEMENT] Dashboards: Add config option gateway_enabled (defaults to true) to disable gateway panels from dashboards. #1761
[ENHANCEMENT] Dashboards: Extend Top tenants dashboard with queries for tenants with highest sample rate, discard rate, and discard rate growth. #1842
[ENHANCEMENT] Dashboards: Show ingestion rate limit and rule group limit on Tenants dashboard. #1845
[ENHANCEMENT] Dashboards: Add "last successful run" panel to compactor dashboard. #1628
[BUGFIX] Dashboards: Fix "Failed evaluation rate" panel on Tenants dashboard. #1629
[BUGFIX] Honor the configured per_instance_label in all dashboards and alerts. #1697

Jsonnet

[FEATURE] Added support for mimir-continuous-test. To deploy mimir-continuous-test you can use the following configuration: #1675 #1850

_config+: {
  continuous_test_enabled: true,
  continuous_test_tenant_id: 'type-tenant-id',
  continuous_test_write_endpoint: 'http://type-write-path-hostname',
  continuous_test_read_endpoint: 'http://type-read-path-hostname/prometheus',
},

[ENHANCEMENT] Ingester anti-affinity can now be disabled by using ingester_allow_multiple_replicas_on_same_node configuration key. #1581
[ENHANCEMENT] Added node_selector configuration option to select Kubernetes nodes where Mimir should run. #1596
[ENHANCEMENT] Alertmanager: Added a PodDisruptionBudget of withMaxUnavailable = 1, to ensure we maintain quorum during rollouts. #1683
[ENHANCEMENT] Store-gateway anti-affinity can now be enabled/disabled using store_gateway_allow_multiple_replicas_on_same_node configuration key. #1730
[ENHANCEMENT] Added store_gateway_zone_a_args, store_gateway_zone_b_args and store_gateway_zone_c_args configuration options. #1807
[BUGFIX] Pass primary and secondary multikv stores via CLI flags. Introduced new multikv_switch_primary_secondary config option to flip primary and secondary in runtime config.

Mimirtool

[BUGFIX] config convert: Retain Cortex defaults for blocks_storage.backend, ruler_storage.backend, alertmanager_storage.backend, auth.type, activity_tracker.filepath, alertmanager.data_dir, blocks_storage.filesystem.dir, compactor.data_dir, ruler.rule_path, ruler_storage.filesystem.dir, and graphite.querier.schemas.backend. #1626 #1762

Tools

[FEATURE] Added a markblocks tool that creates no-compact and delete marks for the blocks. #1551
[FEATURE] Added mimir-continuous-test tool to continuously run smoke tests on live Mimir clusters. #1535 #1540 #1653 #1603 #1630 #1691 #1675 #1676 #1692 #1706 #1709 #1775 #1777 #1778 #1795
[FEATURE] Added mimir-rules-action GitHub action, located at operations/mimir-rules-action/, used to lint, prepare, verify, diff, and sync rules to a Mimir cluster. #1723

2.0.0

Grafana Mimir

Changes since Cortex 1.10.0.

[CHANGE] Remove chunks storage engine. #86 #119 #510 #545 #743 #744 #748 #753 #755 #757 #758 #759 #760 #762 #764 #789 #812 #813
- The following CLI flags (and their respective YAML config options) have been removed:
  - -store.engine
  - -schema-config-file
  - -ingester.checkpoint-duration
  - -ingester.checkpoint-enabled
  - -ingester.chunk-encoding
  - -ingester.chunk-age-jitter
  - -ingester.concurrent-flushes
  - -ingester.flush-on-shutdown-with-wal-enabled
  - -ingester.flush-op-timeout
  - -ingester.flush-period
  - -ingester.max-chunk-age
  - -ingester.max-chunk-idle
  - -ingester.max-series-per-query (and max_series_per_query from runtime config)
  - -ingester.max-stale-chunk-idle
  - -ingester.max-transfer-retries
  - -ingester.min-chunk-length
  - -ingester.recover-from-wal
  - -ingester.retain-period
  - -ingester.spread-flushes
  - -ingester.wal-dir
  - -ingester.wal-enabled
  - -querier.query-parallelism
  - -querier.second-store-engine
  - -querier.use-second-store-before-time
  - -flusher.wal-dir
  - -flusher.concurrent-flushes
  - -flusher.flush-op-timeout
  - All -table-manager.* flags
  - All -deletes.* flags
  - All -purger.* flags
  - All -metrics.* flags
  - All -dynamodb.* flags
  - All -s3.* flags
  - All -azure.* flags
  - All -bigtable.* flags
  - All -gcs.* flags
  - All -cassandra.* flags
  - All -boltdb.* flags
  - All -local.* flags
  - All -swift.* flags
  - All -store.* flags except -store.engine, -store.max-query-length, -store.max-labels-query-length
  - All -grpc-store.* flags
- The following API endpoints have been removed:
  - /api/v1/chunks and /chunks
- The following metrics have been removed:
  - cortex_ingester_flush_queue_length
  - cortex_ingester_queried_chunks
  - cortex_ingester_chunks_created_total
  - cortex_ingester_wal_replay_duration_seconds
  - cortex_ingester_wal_corruptions_total
  - cortex_ingester_sent_chunks
  - cortex_ingester_received_chunks
  - cortex_ingester_flush_series_in_progress
  - cortex_ingester_chunk_utilization
  - cortex_ingester_chunk_length
  - cortex_ingester_chunk_size_bytes
  - cortex_ingester_chunk_age_seconds
  - cortex_ingester_memory_chunks
  - cortex_ingester_flushing_enqueued_series_total
  - cortex_ingester_flushing_dequeued_series_total
  - cortex_ingester_dropped_chunks_total
  - cortex_oldest_unflushed_chunk_timestamp_seconds
  - prometheus_local_storage_chunk_ops_total
  - prometheus_local_storage_chunkdesc_ops_total
  - prometheus_local_storage_memory_chunkdescs
[CHANGE] Changed default storage backends from s3 to filesystem #833 This effects the following flags:
- -blocks-storage.backend now defaults to filesystem
- -blocks-storage.filesystem.dir now defaults to blocks
- -alertmanager-storage.backend now defaults to filesystem
- -alertmanager-storage.filesystem.dir now defaults to alertmanager
- -ruler-storage.backend now defaults to filesystem
- -ruler-storage.filesystem.dir now defaults to ruler
[CHANGE] Renamed metric cortex_experimental_features_in_use_total as cortex_experimental_features_used_total and added feature label. #32 #658
[CHANGE] Removed log_messages_total metric. #32
[CHANGE] Some files and directories created by Mimir components on local disk now have stricter permissions, and are only readable by owner, but not group or others. #58
[CHANGE] Memcached client DNS resolution switched from golang built-in to miekg/dns. #142
[CHANGE] The metric cortex_deprecated_flags_inuse_total has been renamed to deprecated_flags_inuse_total as part of using grafana/dskit functionality. #185
[CHANGE] API: The -api.response-compression-enabled flag has been removed, and GZIP response compression is always enabled except on /api/v1/push and /push endpoints. #880
[CHANGE] Update Go version to 1.17.3. #480
[CHANGE] The status_code label on gRPC client metrics has changed from '200' and '500' to '2xx', '5xx', '4xx', 'cancel' or 'error'. #537
[CHANGE] Removed the deprecated -<prefix>.fifocache.size flag. #618
[CHANGE] Enable index header lazy loading by default. #693
- -blocks-storage.bucket-store.index-header-lazy-loading-enabled default from false to true
- -blocks-storage.bucket-store.index-header-lazy-loading-idle-timeout default from 20m to 1h
[CHANGE] Shuffle-sharding:
- -distributor.sharding-strategy option has been removed, and shuffle sharding is enabled by default. Default shard size is set to 0, which disables shuffle sharding for the tenant (all ingesters will receive tenants's samples). #888
- -ruler.sharding-strategy option has been removed from ruler. Ruler now uses shuffle-sharding by default, but respects ruler_tenant_shard_size, which defaults to 0 (ie. use all rulers for tenant). #889
- -store-gateway.sharding-strategy option has been removed store-gateways. Store-gateway now uses shuffle-sharding by default, but respects store_gateway_tenant_shard_size for tenant, and this value defaults to 0. #891
[CHANGE] Server: -server.http-listen-port (yaml: server.http_listen_port) now defaults to 8080 (previously 80). #871
[CHANGE] Changed the default value of -blocks-storage.bucket-store.ignore-deletion-marks-delay from 6h to 1h. #892
[CHANGE] Changed default settings for memcached clients: #959 #1000
- The default value for the following config options has changed from 10000 to 25000:
  - -blocks-storage.bucket-store.chunks-cache.memcached.max-async-buffer-size
  - -blocks-storage.bucket-store.index-cache.memcached.max-async-buffer-size
  - -blocks-storage.bucket-store.metadata-cache.memcached.max-async-buffer-size
  - -query-frontend.results-cache.memcached.max-async-buffer-size
- The default value for the following config options has changed from 0 (unlimited) to 100:
  - -blocks-storage.bucket-store.chunks-cache.memcached.max-get-multi-batch-size
  - -blocks-storage.bucket-store.index-cache.memcached.max-get-multi-batch-size
  - -blocks-storage.bucket-store.metadata-cache.memcached.max-get-multi-batch-size
  - -query-frontend.results-cache.memcached.max-get-multi-batch-size
- The default value for the following config options has changed from 16 to 100:
  - -blocks-storage.bucket-store.chunks-cache.memcached.max-idle-connections
  - -blocks-storage.bucket-store.index-cache.memcached.max-idle-connections
  - -blocks-storage.bucket-store.metadata-cache.memcached.max-idle-connections
  - -query-frontend.results-cache.memcached.max-idle-connections
- The default value for the following config options has changed from 100ms to 200ms:
  - -blocks-storage.bucket-store.metadata-cache.memcached.timeout
  - -blocks-storage.bucket-store.index-cache.memcached.timeout
  - -blocks-storage.bucket-store.chunks-cache.memcached.timeout
  - -query-frontend.results-cache.memcached.timeout
[CHANGE] Changed the default value of -blocks-storage.bucket-store.bucket-index.enabled to true. The default configuration must now run the compactor in order to write the bucket index or else queries to long term storage will fail. #924
[CHANGE] Option -auth.enabled has been renamed to -auth.multitenancy-enabled. #1130
[CHANGE] Default tenant ID used with disabled auth (-auth.multitenancy-enabled=false) has changed from fake to anonymous. This tenant ID can now be changed with -auth.no-auth-tenant option. #1063
[CHANGE] The default values for the following local directories have changed: #1072
- -alertmanager.storage.path default value changed to ./data-alertmanager/
- -compactor.data-dir default value changed to ./data-compactor/
- -ruler.rule-path default value changed to ./data-ruler/
[CHANGE] The default value for gRPC max send message size has been changed from 16MB to 100MB. This affects the following parameters: #1152
- -query-frontend.grpc-client-config.grpc-max-send-msg-size
- -ingester.client.grpc-max-send-msg-size
- -querier.frontend-client.grpc-max-send-msg-size
- -query-scheduler.grpc-client-config.grpc-max-send-msg-size
- -ruler.client.grpc-max-send-msg-size
[CHANGE] Remove -http.prefix flag (and http_prefix config file option). #763

[CHANGE] Remove legacy endpoints. Please use their alternatives listed below. As part of the removal process we are introducing two new sets of endpoints for the ruler configuration API: <prometheus-http-prefix>/rules and <prometheus-http-prefix>/config/v1/rules/**. We are also deprecating <prometheus-http-prefix>/rules and /api/v1/rules; and will remove them in Mimir 2.2.0. #763 #1222

Query endpoints

Legacy	Alternative
`/<legacy-http-prefix>/api/v1/query`	`<prometheus-http-prefix>/api/v1/query`
`/<legacy-http-prefix>/api/v1/query_range`	`<prometheus-http-prefix>/api/v1/query_range`
`/<legacy-http-prefix>/api/v1/query_exemplars`	`<prometheus-http-prefix>/api/v1/query_exemplars`
`/<legacy-http-prefix>/api/v1/series`	`<prometheus-http-prefix>/api/v1/series`
`/<legacy-http-prefix>/api/v1/labels`	`<prometheus-http-prefix>/api/v1/labels`
`/<legacy-http-prefix>/api/v1/label/{name}/values`	`<prometheus-http-prefix>/api/v1/label/{name}/values`
`/<legacy-http-prefix>/api/v1/metadata`	`<prometheus-http-prefix>/api/v1/metadata`
`/<legacy-http-prefix>/api/v1/read`	`<prometheus-http-prefix>/api/v1/read`
`/<legacy-http-prefix>/api/v1/cardinality/label_names`	`<prometheus-http-prefix>/api/v1/cardinality/label_names`
`/<legacy-http-prefix>/api/v1/cardinality/label_values`	`<prometheus-http-prefix>/api/v1/cardinality/label_values`
`/api/prom/user_stats`	`/api/v1/user_stats`

Distributor endpoints

Legacy endpoint Alternative

/<legacy-http-prefix>/push /api/v1/push

/all_user_stats /distributor/all_user_stats

/ha-tracker /distributor/ha_tracker
Ingester endpoints

Legacy Alternative

/ring /ingester/ring

/shutdown /ingester/shutdown

/flush /ingester/flush

/push /ingester/push

Ruler endpoints

Legacy	Alternative	Alternative #2 (not available before Mimir 2.0.0)
`/<legacy-http-prefix>/api/v1/rules`	`<prometheus-http-prefix>/api/v1/rules`
`/<legacy-http-prefix>/api/v1/alerts`	`<prometheus-http-prefix>/api/v1/alerts`
`/<legacy-http-prefix>/rules`	`/api/v1/rules` (see below)	`<prometheus-http-prefix>/config/v1/rules`
`/<legacy-http-prefix>/rules/{namespace}`	`/api/v1/rules/{namespace}` (see below)	`<prometheus-http-prefix>/config/v1/rules/{namespace}`
`/<legacy-http-prefix>/rules/{namespace}/{groupName}`	`/api/v1/rules/{namespace}/{groupName}` (see below)	`<prometheus-http-prefix>/config/v1/rules/{namespace}/{groupName}`
`/<legacy-http-prefix>/rules/{namespace}`	`/api/v1/rules/{namespace}` (see below)	`<prometheus-http-prefix>/config/v1/rules/{namespace}`
`/<legacy-http-prefix>/rules/{namespace}/{groupName}`	`/api/v1/rules/{namespace}/{groupName}` (see below)	`<prometheus-http-prefix>/config/v1/rules/{namespace}/{groupName}`
`/<legacy-http-prefix>/rules/{namespace}`	`/api/v1/rules/{namespace}` (see below)	`<prometheus-http-prefix>/config/v1/rules/{namespace}`
`/ruler_ring`	`/ruler/ring`

Note: The /api/v1/rules/** endpoints are considered deprecated with Mimir 2.0.0 and will be removed in Mimir 2.2.0. After upgrading to 2.0.0 we recommend switching uses to the equivalent /<prometheus-http-prefix>/config/v1/** endpoints that Mimir 2.0.0 introduces.

Alertmanager endpoints

Legacy Alternative

/<legacy-http-prefix> /alertmanager

/status /multitenant_alertmanager/status

[CHANGE] Ingester: changed -ingester.stream-chunks-when-using-blocks default value from false to true. #717
[CHANGE] Ingester: default -ingester.ring.min-ready-duration reduced from 1m to 15s. #126
[CHANGE] Ingester: -ingester.ring.min-ready-duration now start counting the delay after the ring's health checks have passed instead of when the ring client was started. #126
[CHANGE] Ingester: allow experimental ingester max-exemplars setting to be changed dynamically #144
- CLI flag -blocks-storage.tsdb.max-exemplars is renamed to -ingester.max-global-exemplars-per-user.
- YAML max_exemplars is moved from tsdb to overrides and renamed to max_global_exemplars_per_user.
[CHANGE] Ingester: active series metrics cortex_ingester_active_series and cortex_ingester_active_series_custom_tracker are now removed when their value is zero. #672 #690
[CHANGE] Ingester: changed default value of -blocks-storage.tsdb.retention-period from 6h to 24h. #966
[CHANGE] Ingester: changed default value of -blocks-storage.tsdb.close-idle-tsdb-timeout from 0 to 13h. #967
[CHANGE] Ingester: changed default value of -ingester.ring.final-sleep from 30s to 0s. #981
[CHANGE] Ingester: the following low level settings have been removed: #1153
- -ingester-client.expected-labels
- -ingester-client.expected-samples-per-series
- -ingester-client.expected-timeseries
[CHANGE] Ingester: following command line options related to ingester ring were renamed: #1155
- -consul.* changed to -ingester.ring.consul.*
- -etcd.* changed to -ingester.ring.etcd.*
- -multi.* changed to -ingester.ring.multi.*
- -distributor.excluded-zones changed to -ingester.ring.excluded-zones
- -distributor.replication-factor changed to -ingester.ring.replication-factor
- -distributor.zone-awareness-enabled changed to -ingester.ring.zone-awareness-enabled
- -ingester.availability-zone changed to -ingester.ring.instance-availability-zone
- -ingester.final-sleep changed to -ingester.ring.final-sleep
- -ingester.heartbeat-period changed to -ingester.ring.heartbeat-period
- -ingester.join-after changed to -ingester.ring.join-after
- -ingester.lifecycler.ID changed to -ingester.ring.instance-id
- -ingester.lifecycler.addr changed to -ingester.ring.instance-addr
- -ingester.lifecycler.interface changed to -ingester.ring.instance-interface-names
- -ingester.lifecycler.port changed to -ingester.ring.instance-port
- -ingester.min-ready-duration changed to -ingester.ring.min-ready-duration
- -ingester.num-tokens changed to -ingester.ring.num-tokens
- -ingester.observe-period changed to -ingester.ring.observe-period
- -ingester.readiness-check-ring-health changed to -ingester.ring.readiness-check-ring-health
- -ingester.tokens-file-path changed to -ingester.ring.tokens-file-path
- -ingester.unregister-on-shutdown changed to -ingester.ring.unregister-on-shutdown
- -ring.heartbeat-timeout changed to -ingester.ring.heartbeat-timeout
- -ring.prefix changed to -ingester.ring.prefix
- -ring.store changed to -ingester.ring.store
[CHANGE] Ingester: fields in YAML configuration for ingester ring have been changed: #1155
- ingester.lifecycler changed to ingester.ring
- Fields from ingester.lifecycler.ring moved to ingester.ring
- ingester.lifecycler.address changed to ingester.ring.instance_addr
- ingester.lifecycler.id changed to ingester.ring.instance_id
- ingester.lifecycler.port changed to ingester.ring.instance_port
- ingester.lifecycler.availability_zone changed to ingester.ring.instance_availability_zone
- ingester.lifecycler.interface_names changed to ingester.ring.instance_interface_names
[CHANGE] Distributor: removed the -distributor.shard-by-all-labels configuration option. It is now assumed to be true. #698
[CHANGE] Distributor: change default value of -distributor.instance-limits.max-inflight-push-requests to 2000. #964
[CHANGE] Distributor: change default value of -distributor.remote-timeout from 2s to 20s. #970
[CHANGE] Distributor: removed the -distributor.extra-query-delay flag (and its respective YAML config option). #1048
[CHANGE] Query-frontend: Enable query stats by default, they can still be disabled with -query-frontend.query-stats-enabled=false. #83
[CHANGE] Query-frontend: the cortex_frontend_mapped_asts_total metric has been renamed to cortex_frontend_query_sharding_rewrites_attempted_total. #150
[CHANGE] Query-frontend: added sharded label to cortex_query_seconds_total metric. #235
[CHANGE] Query-frontend: changed the flag name for controlling query sharding total shards from -querier.total-shards to -query-frontend.query-sharding-total-shards. #230
[CHANGE] Query-frontend: flag -querier.parallelise-shardable-queries has been renamed to -query-frontend.parallelize-shardable-queries #284
[CHANGE] Query-frontend: removed the deprecated (and unused) -frontend.cache-split-interval. Use -query-frontend.split-queries-by-interval instead. #587
[CHANGE] Query-frontend: range query response now omits the data field when it's empty (error case) like Prometheus does, previously it was "data":{"resultType":"","result":null}. #629
[CHANGE] Query-frontend: instant queries now honor the -query-frontend.max-retries-per-request flag. #630
[CHANGE] Query-frontend: removed in-memory and Redis cache support. Reason is that these caching backends were just supported by query-frontend, while all other Mimir services only support memcached. #796
- The following CLI flags (and their respective YAML config options) have been removed:
  - -frontend.cache.enable-fifocache
  - -frontend.redis.*
  - -frontend.fifocache.*
- The following metrics have been removed:
  - querier_cache_added_total
  - querier_cache_added_new_total
  - querier_cache_evicted_total
  - querier_cache_entries
  - querier_cache_gets_total
  - querier_cache_misses_total
  - querier_cache_stale_gets_total
  - querier_cache_memory_bytes
  - cortex_rediscache_request_duration_seconds
[CHANGE] Query-frontend: migrated memcached backend client to the same one used in other components (memcached config and metrics are now consistent across all Mimir services). #821
- The following CLI flags (and their respective YAML config options) have been added:
  - -query-frontend.results-cache.backend (set it to memcached if -query-frontend.cache-results=true)
- The following CLI flags (and their respective YAML config options) have been changed:
  - -frontend.memcached.hostname and -frontend.memcached.service have been removed: use -query-frontend.results-cache.memcached.addresses instead
- The following CLI flags (and their respective YAML config options) have been renamed:
  - -frontend.background.write-back-concurrency renamed to -query-frontend.results-cache.memcached.max-async-concurrency
  - -frontend.background.write-back-buffer renamed to -query-frontend.results-cache.memcached.max-async-buffer-size
  - -frontend.memcached.batchsize renamed to -query-frontend.results-cache.memcached.max-get-multi-batch-size
  - -frontend.memcached.parallelism renamed to -query-frontend.results-cache.memcached.max-get-multi-concurrency
  - -frontend.memcached.timeout renamed to -query-frontend.results-cache.memcached.timeout
  - -frontend.memcached.max-item-size renamed to -query-frontend.results-cache.memcached.max-item-size
  - -frontend.memcached.max-idle-conns renamed to -query-frontend.results-cache.memcached.max-idle-connections
  - -frontend.compression renamed to -query-frontend.results-cache.compression
- The following CLI flags (and their respective YAML config options) have been removed:
  - -frontend.memcached.circuit-breaker-consecutive-failures: feature removed
  - -frontend.memcached.circuit-breaker-timeout: feature removed
  - -frontend.memcached.circuit-breaker-interval: feature removed
  - -frontend.memcached.update-interval: new setting is hardcoded to 30s
  - -frontend.memcached.consistent-hash: new setting is always enabled
  - -frontend.default-validity and -frontend.memcached.expiration: new setting is hardcoded to 7 days
- The following metrics have been changed:
  - cortex_cache_dropped_background_writes_total{name} changed to thanos_memcached_operation_skipped_total{name, operation, reason}
  - cortex_cache_value_size_bytes{name, method} changed to thanos_memcached_operation_data_size_bytes{name}
  - cortex_cache_request_duration_seconds{name, method, status_code} changed to thanos_memcached_operation_duration_seconds{name, operation}
  - cortex_cache_fetched_keys{name} changed to thanos_cache_memcached_requests_total{name}
  - cortex_cache_hits{name} changed to thanos_cache_memcached_hits_total{name}
  - cortex_memcache_request_duration_seconds{name, method, status_code} changed to thanos_memcached_operation_duration_seconds{name, operation}
  - cortex_memcache_client_servers{name} changed to thanos_memcached_dns_provider_results{name, addr}
  - cortex_memcache_client_set_skip_total{name} changed to thanos_memcached_operation_skipped_total{name, operation, reason}
  - cortex_dns_lookups_total changed to thanos_memcached_dns_lookups_total
  - For all metrics the value of the "name" label has changed from frontend.memcached to frontend-cache
- The following metrics have been removed:
  - cortex_cache_background_queue_length{name}
[CHANGE] Query-frontend: merged query_range into frontend in the YAML config (keeping the same keys) and renamed flags: #825
- -querier.max-retries-per-request renamed to -query-frontend.max-retries-per-request
- -querier.split-queries-by-interval renamed to -query-frontend.split-queries-by-interval
- -querier.align-querier-with-step renamed to -query-frontend.align-querier-with-step
- -querier.cache-results renamed to -query-frontend.cache-results
- -querier.parallelise-shardable-queries renamed to -query-frontend.parallelize-shardable-queries
[CHANGE] Query-frontend: the default value of -query-frontend.split-queries-by-interval has changed from 0 to 24h. #1131
[CHANGE] Query-frontend: -frontend. flags were renamed to -query-frontend.: #1167
[CHANGE] Query-frontend / Query-scheduler: classified the -query-frontend.querier-forget-delay and -query-scheduler.querier-forget-delay flags (and their respective YAML config options) as experimental. #1208
[CHANGE] Querier / ruler: Change -querier.max-fetched-chunks-per-query configuration to limit to maximum number of chunks that can be fetched in a single query. The number of chunks fetched by ingesters AND long-term storare combined should not exceed the value configured on -querier.max-fetched-chunks-per-query. #4260
[CHANGE] Querier / ruler: Option -querier.ingester-streaming has been removed. Querier/ruler now always use streaming method to query ingesters. #204
[CHANGE] Querier: always fetch labels from store and respect start/end times in request; the option -querier.query-store-for-labels-enabled has been removed and is now always on. #518 #1132
[CHANGE] Querier / ruler: removed the -store.query-chunk-limit flag (and its respective YAML config option max_chunks_per_query). -querier.max-fetched-chunks-per-query (and its respective YAML config option max_fetched_chunks_per_query) should be used instead. #705
[CHANGE] Querier/Ruler: -querier.active-query-tracker-dir option has been removed. Active query tracking is now done via Activity tracker configured by -activity-tracker.filepath and enabled by default. Limit for max number of concurrent queries (-querier.max-concurrent) is now respected even if activity tracking is not enabled. #661 #822
[CHANGE] Querier/ruler/query-frontend: the experimental -querier.at-modifier-enabled CLI flag has been removed and the PromQL @ modifier is always enabled. #941
[CHANGE] Querier: removed -querier.worker-match-max-concurrent and -querier.worker-parallelism CLI flags (and their respective YAML config options). Mimir now behaves like if -querier.worker-match-max-concurrent is always enabled and you should configure the max concurrency per querier process using -querier.max-concurrent instead. #958
[CHANGE] Querier: changed default value of -querier.query-ingesters-within from 0 to 13h. #967
[CHANGE] Querier: rename metric cortex_query_fetched_chunks_bytes_total to cortex_query_fetched_chunk_bytes_total to be consistent with the limit name. #476
[CHANGE] Ruler: add two new metrics cortex_ruler_list_rules_seconds and cortex_ruler_load_rule_groups_seconds to the ruler. #906
[CHANGE] Ruler: endpoints for listing configured rules now return HTTP status code 200 and an empty map when there are no rules instead of an HTTP 404 and plain text error message. The following endpoints are affected: #456
- <prometheus-http-prefix>/config/v1/rules
- <prometheus-http-prefix>/config/v1/rules/{namespace}
- <prometheus-http-prefix>/rules (deprecated)
- <prometheus-http-prefix>/rules/{namespace} (deprecated)
- /api/v1/rules (deprecated)
- /api/v1/rules/{namespace} (deprecated)
[CHANGE] Ruler: removed configdb support from Ruler backend storages. #15 #38 #819
[CHANGE] Ruler: removed the support for the deprecated storage configuration via -ruler.storage.* CLI flags (and their respective YAML config options). Use -ruler-storage.* instead. #628
[CHANGE] Ruler: set new default limits for rule groups: -ruler.max-rules-per-rule-group to 20 (previously 0, disabled) and -ruler.max-rule-groups-per-tenant to 70 (previously 0, disabled). #847
[CHANGE] Ruler: removed -ruler.enable-sharding option, and changed default value of -ruler.ring.store to memberlist. #943
[CHANGE] Ruler: -ruler.alertmanager-use-v2 has been removed. The ruler will always use the v2 endpoints. #954 #1100
[CHANGE] Ruler: -experimental.ruler.enable-api flag has been renamed to -ruler.enable-api and is now stable. The default value has also changed from false to true, so both ruler and alertmanager API are enabled by default. #913 #1065
[CHANGE] Ruler: add support for DNS service discovery format for -ruler.alertmanager-url. -ruler.alertmanager-discovery flag has been removed. URLs following the prior SRV format, will be treated as a static target. To continue using service discovery for these URLs prepend dnssrvnoa+ to them. #993
- The following metrics for Alertmanager DNS service discovery are replaced:
  - prometheus_sd_dns_lookups_total replaced by cortex_dns_lookups_total{component="ruler"}
  - prometheus_sd_dns_lookup_failures_total replaced by cortex_dns_failures_total{component="ruler"}
[CHANGE] Ruler: deprecate /api/v1/rules/** and <prometheus-http-prefix/rules/** configuration API endpoints in favour of /<prometheus-http-prefix>/config/v1/rules/**. Deprecated endpoints will be removed in Mimir 2.2.0. Main configuration API endpoints are now /<prometheus-http-prefix>/config/api/v1/rules/** introduced in Mimir 2.0.0. #1222
[CHANGE] Store-gateway: index cache now includes tenant in cache keys, this invalidates previous cached entries. #607
[CHANGE] Store-gateway: increased memcached index caching TTL from 1 day to 7 days. #718
[CHANGE] Store-gateway: options -store-gateway.sharding-enabled and -querier.store-gateway-addresses were removed. Default value of -store-gateway.sharding-ring.store is now memberlist and default value for -store-gateway.sharding-ring.wait-stability-min-duration changed from 1m to 0 (disabled). #976
[CHANGE] Compactor: compactor will no longer try to compact blocks that are already marked for deletion. Previously compactor would consider blocks marked for deletion within -compactor.deletion-delay / 2 period as eligible for compaction. #4328
[CHANGE] Compactor: Removed support for block deletion marks migration. If you're upgrading from Cortex < 1.7.0 to Mimir, you should upgrade the compactor to Cortex >= 1.7.0 first, run it at least once and then upgrade to Mimir. #122
[CHANGE] Compactor: removed the cortex_compactor_group_vertical_compactions_total metric. #278
[CHANGE] Compactor: no longer waits for initial blocks cleanup to finish before starting compactions. #282
[CHANGE] Compactor: removed overlapping sources detection. Overlapping sources may exist due to edge cases (timing issues) when horizontally sharding compactor, but are correctly handled by compactor. #494
[CHANGE] Compactor: compactor now uses deletion marks from <tenant>/markers location in the bucket. Marker files are no longer fetched, only listed. #550
[CHANGE] Compactor: Default value of -compactor.block-sync-concurrency has changed from 20 to 8. This flag is now only used to control number of goroutines for downloading and uploading blocks during compaction. #552
[CHANGE] Compactor is now included in all target (single-binary). #866
[CHANGE] Compactor: Removed -compactor.sharding-enabled option. Sharding in compactor is now always enabled. Default value of -compactor.ring.store has changed from consul to memberlist. Default value of -compactor.ring.wait-stability-min-duration is now 0, which disables the feature. #956
[CHANGE] Alertmanager: removed -alertmanager.configs.auto-webhook-root #977
[CHANGE] Alertmanager: removed configdb support from Alertmanager backend storages. #15 #38 #819
[CHANGE] Alertmanager: Don't count user-not-found errors from replicas as failures in the cortex_alertmanager_state_fetch_replica_state_failed_total metric. #190
[CHANGE] Alertmanager: Use distributor for non-API routes. #213
[CHANGE] Alertmanager: removed -alertmanager.storage.* configuration options, with the exception of the CLI flags -alertmanager.storage.path and -alertmanager.storage.retention. Use -alertmanager-storage.* instead. #632
[CHANGE] Alertmanager: set default value for -alertmanager.web.external-url=http://localhost:8080/alertmanager to match the default configuration. #808 #1067
[CHANGE] Alertmanager: -experimental.alertmanager.enable-api flag has been renamed to -alertmanager.enable-api and is now stable. #913
[CHANGE] Alertmanager: now always runs with sharding enabled; other modes of operation are removed. #1044 #1126
- The following configuration options are removed:
  - -alertmanager.sharding-enabled
  - -alertmanager.cluster.advertise-address
  - -alertmanager.cluster.gossip-interval
  - -alertmanager.cluster.listen-address
  - -alertmanager.cluster.peers
  - -alertmanager.cluster.push-pull-interval
- The following configuration options are renamed:
  - -alertmanager.cluster.peer-timeout to -alertmanager.peer-timeout
[CHANGE] Alertmanager: the default value of -alertmanager.sharding-ring.store is now memberlist. #1171
[CHANGE] Ring: changed default value of -distributor.ring.store (Distributor ring) and -ring.store (Ingester ring) to memberlist. #1046
[CHANGE] Memberlist: the memberlist_kv_store_value_bytes metric has been removed due to values no longer being stored in-memory as encoded bytes. #4345
[CHANGE] Memberlist: forward only changes, not entire original message. #4419
[CHANGE] Memberlist: don't accept old tombstones as incoming change, and don't forward such messages to other gossip members. #4420
[CHANGE] Memberlist: changed probe interval from 1s to 5s and probe timeout from 500ms to 2s. #563
[CHANGE] Memberlist: the name label on metrics cortex_dns_failures_total, cortex_dns_lookups_total and cortex_dns_provider_results was renamed to component. #993
[CHANGE] Limits: removed deprecated limits for rejecting old samples #799 This removes the following flags:
- -validation.reject-old-samples
- -validation.reject-old-samples.max-age
[CHANGE] Limits: removed local limit-related flags in favor of global limits. #725 The distributor ring is now required, and can be configured via the distributor.ring.* flags. This removes the following flags:
- -distributor.ingestion-rate-strategy -> will now always use the "global" strategy
- -ingester.max-series-per-user -> set -ingester.max-global-series-per-user to N times the existing value of -ingester.max-series-per-user instead
- -ingester.max-series-per-metric -> set -ingester.max-global-series-per-metric to N times the existing value of -ingester.max-series-per-metric instead
- -ingester.max-metadata-per-user -> set -ingester.max-global-metadata-per-user to N times the existing value of -ingester.max-metadata-per-user instead
- -ingester.max-metadata-per-metric -> set -ingester.max-global-metadata-per-metric to N times the existing value of -ingester.max-metadata-per-metric instead
- In the above notes, N refers to the number of ingester replicas Additionally, default values for the following flags have changed:
- -ingester.max-global-series-per-user from 0 to 150000
- -ingester.max-global-series-per-metric from 0 to 20000
- -distributor.ingestion-rate-limit from 25000 to 10000
- -distributor.ingestion-burst-size from 50000 to 200000
[CHANGE] Limits: removed limit enforce_metric_name, now behave as if set to true always. #686
[CHANGE] Limits: Option -ingester.max-samples-per-query and its YAML field max_samples_per_query have been removed. It required -querier.ingester-streaming option to be set to false, but since -querier.ingester-streaming is removed (always defaulting to true), the limit using it was removed as well. #204 #1132
[CHANGE] Limits: Set the default max number of inflight ingester push requests (-ingester.instance-limits.max-inflight-push-requests) to 30000 in order to prevent clusters from being overwhelmed by request volume or temporary slow-downs. #259
[CHANGE] Overrides exporter: renamed metric cortex_overrides to cortex_limits_overrides. #173 #407
[FEATURE] The following features have been moved from experimental to stable: #913 #1002
- Alertmanager config API
- Alertmanager receiver firewall
- Alertmanager sharding
- Azure blob storage support
- Blocks storage bucket index
- Disable the ring health check in the readiness endpoint (-ingester.readiness-check-ring-health=false)
- Distributor: do not extend writes on unhealthy ingesters
- Do not unregister ingesters from ring on shutdown (-ingester.unregister-on-shutdown=false)
- HA Tracker: cleanup of old replicas from KV Store
- Instance limits in ingester and distributor
- OpenStack Swift storage support
- Query-frontend: query stats tracking
- Query-scheduler
- Querier: tenant federation
- Ruler config API
- S3 Server Side Encryption (SSE) using KMS
- TLS configuration for gRPC, HTTP and etcd clients
- Zone-aware replication
- /labels API using matchers
- The following querier limits:
  - -querier.max-fetched-chunks-per-query
  - -querier.max-fetched-chunk-bytes-per-query
  - -querier.max-fetched-series-per-query
- The following alertmanager limits:
  - Notification rate (-alertmanager.notification-rate-limit and -alertmanager.notification-rate-limit-per-integration)
  - Dispatcher groups (-alertmanager.max-dispatcher-aggregation-groups)
  - User config size (-alertmanager.max-config-size-bytes)
  - Templates count in user config (-alertmanager.max-templates-count)
  - Max template size (-alertmanager.max-template-size-bytes)
[FEATURE] The endpoints /api/v1/status/buildinfo, <prometheus-http-prefix>/api/v1/status/buildinfo, and <alertmanager-http-prefix>/api/v1/status/buildinfo have been added to display build information and enabled features. #1219 #1240
[FEATURE] PromQL: added present_over_time support. #139
[FEATURE] Added "Activity tracker" feature which can log ongoing activities from previous Mimir run in case of a crash. It is enabled by default and controlled by the -activity-tracker.filepath flag. It can be disabled by setting this path to an empty string. Currently, the Store-gateway, Ruler, Querier, Query-frontend and Ingester components use this feature to track queries. #631 #782 #822 #1121
[FEATURE] Divide configuration parameters into categories "basic", "advanced", and "experimental". Only flags in the basic category are shown when invoking -help, whereas -help-all will include flags in all categories (basic, advanced, experimental). #840
[FEATURE] Querier: Added support for tenant federation to exemplar endpoints. #927
[FEATURE] Ingester: can expose metrics on active series matching custom trackers configured via -ingester.active-series-custom-trackers (or its respective YAML config option). When configured, active series for custom trackers are exposed by the cortex_ingester_active_series_custom_tracker metric. #42 #672
[FEATURE] Ingester: Enable snapshotting of in-memory TSDB on disk during shutdown via -blocks-storage.tsdb.memory-snapshot-on-shutdown (experimental). #249
[FEATURE] Ingester: Added -blocks-storage.tsdb.isolation-enabled flag, which allows disabling TSDB isolation feature. This is enabled by default (per TSDB default), but disabling can improve performance of write requests. #512
[FEATURE] Ingester: Added -blocks-storage.tsdb.head-chunks-write-queue-size flag, which allows setting the size of the queue used by the TSDB before m-mapping chunks (experimental). #591
- Added cortex_ingester_tsdb_mmap_chunk_write_queue_operations_total metric to track different operations of this queue.
[FEATURE] Distributor: Added -api.skip-label-name-validation-header-enabled option to allow skipping label name validation on the HTTP write path based on X-Mimir-SkipLabelNameValidation header being true or not. #390
[FEATURE] Query-frontend: Add cortex_query_fetched_series_total and cortex_query_fetched_chunks_bytes_total per-user counters to expose the number of series and bytes fetched as part of queries. These metrics can be enabled with the -frontend.query-stats-enabled flag (or its respective YAML config option query_stats_enabled). #4343
[FEATURE] Query-frontend: Add cortex_query_fetched_chunks_total per-user counter to expose the number of chunks fetched as part of queries. This metric can be enabled with the -query-frontend.query-stats-enabled flag (or its respective YAML config option query_stats_enabled). #31
[FEATURE] Query-frontend: Add query sharding for instant and range queries. You can enable querysharding by setting -query-frontend.parallelize-shardable-queries to true. The following additional config and exported metrics have been added. #79 #80 #100 #124 #140 #148 #150 #151 #153 #154 #155 #156 #157 #158 #159 #160 #163 #169 #172 #196 #205 #225 #226 #227 #228 #230 #235 #240 #239 #246 #244 #319 #330 #371 #385 #400 #458 #586 #630 #660 #707 #1542
- New config options:
  - -query-frontend.query-sharding-total-shards: The amount of shards to use when doing parallelisation via query sharding.
  - -query-frontend.query-sharding-max-sharded-queries: The max number of sharded queries that can be run for a given received query. 0 to disable limit.
  - -blocks-storage.bucket-store.series-hash-cache-max-size-bytes: Max size - in bytes - of the in-memory series hash cache in the store-gateway.
  - -blocks-storage.tsdb.series-hash-cache-max-size-bytes: Max size - in bytes - of the in-memory series hash cache in the ingester.
- New exported metrics:
  - cortex_bucket_store_series_hash_cache_requests_total
  - cortex_bucket_store_series_hash_cache_hits_total
  - cortex_frontend_query_sharding_rewrites_succeeded_total
  - cortex_frontend_sharded_queries_per_query
- Renamed metrics:
  - cortex_frontend_mapped_asts_total to cortex_frontend_query_sharding_rewrites_attempted_total
- Modified metrics:
  - added sharded label to cortex_query_seconds_total
- When query sharding is enabled, the following querier config must be set on query-frontend too:
  - -querier.max-concurrent
  - -querier.timeout
  - -querier.max-samples
  - -querier.at-modifier-enabled
  - -querier.default-evaluation-interval
  - -querier.active-query-tracker-dir
  - -querier.lookback-delta
- Sharding can be dynamically controlled per request using the Sharding-Control: 64 header. (0 to disable)
- Sharding can be dynamically controlled per tenant using the limit query_sharding_total_shards. (0 to disable)
- Added sharded_queries count to the "query stats" log.
- The number of shards is adjusted to be compatible with number of compactor shards that are used by a split-and-merge compactor. The querier can use this to avoid querying blocks that cannot have series in a given query shard.
[FEATURE] Query-Frontend: Added -query-frontend.cache-unaligned-requests option to cache responses for requests that do not have step-aligned start and end times. This can improve speed of repeated queries, but can also pollute cache with results that are never reused. #432
[FEATURE] Querier: Added label names cardinality endpoint <prefix>/api/v1/cardinality/label_names that is disabled by default. Can be enabled/disabled via the CLI flag -querier.cardinality-analysis-enabled or its respective YAML config option. Configurable on a per-tenant basis. #301 #377 #474
[FEATURE] Querier: Added label values cardinality endpoint <prefix>/api/v1/cardinality/label_values that is disabled by default. Can be enabled/disabled via the CLI flag -querier.cardinality-analysis-enabled or its respective YAML config option, and configurable on a per-tenant basis. The maximum number of label names allowed to be queried in a single API call can be controlled via -querier.label-values-max-cardinality-label-names-per-request. #332 #395 #474
[FEATURE] Querier: Added -store.max-labels-query-length to restrict the range of /series, label-names and label-values requests. #507
[FEATURE] Ruler: Add new -ruler.query-stats-enabled which when enabled will report the cortex_ruler_query_seconds_total as a per-user metric that tracks the sum of the wall time of executing queries in the ruler in seconds. #4317
[FEATURE] Ruler: Added federated rule groups. #533
- Added -ruler.tenant-federation.enabled config flag.
- Added support for source_tenants field on rule groups.
[FEATURE] Store-gateway: Added /store-gateway/tenants and /store-gateway/tenant/{tenant}/blocks endpoints that provide functionality that was provided by tools/listblocks. #911 #973
[FEATURE] Compactor: compactor now uses new algorithm that we call "split-and-merge". Previous compaction strategy was removed. With the split-and-merge compactor source blocks for a given tenant are grouped into -compactor.split-groups number of groups. Each group of blocks is then compacted separately, and is split into -compactor.split-and-merge-shards shards (configurable on a per-tenant basis). Compaction of each tenant shards can be horizontally scaled. Number of compactors that work on jobs for single tenant can be limited by using -compactor.compactor-tenant-shard-size parameter, or per-tenant compactor_tenant_shard_size override. #275 #281 #282 #283 #288 #290 #303 #307 #317 #323 #324 #328 #353 #368 #479 #820
[FEATURE] Compactor: Added -compactor.max-compaction-time to control how long can compaction for a single tenant take. If compactions for a tenant take longer, no new compactions are started in the same compaction cycle. Running compactions are not stopped however, and may take much longer. #523
[FEATURE] Compactor: When compactor finds blocks with out-of-order chunks, it will mark them for no-compaction. Blocks marked for no-compaction are ignored in future compactions too. Added metric cortex_compactor_blocks_marked_for_no_compaction_total to track number of blocks marked for no-compaction. Added CortexCompactorSkippedBlocksWithOutOfOrderChunks alert based on new metric. Markers are only checked from <tenant>/markers location, but uploaded to the block directory too. #520 #535 #550
[FEATURE] Compactor: multiple blocks are now downloaded and uploaded at once, which can shorten compaction process. #552
[ENHANCEMENT] Exemplars are now emitted for all gRPC calls and many operations tracked by histograms. #180
[ENHANCEMENT] New options -server.http-listen-network and -server.grpc-listen-network allow binding as 'tcp4' or 'tcp6'. #180
[ENHANCEMENT] Query federation: improve performance in MergeQueryable by memoizing labels. #312
[ENHANCEMENT] Add histogram metrics cortex_distributor_sample_delay_seconds and cortex_ingester_tsdb_sample_out_of_order_delta_seconds #488
[ENHANCEMENT] Check internal directory access before starting up. #1217
[ENHANCEMENT] Azure client: expose option to configure MSI URL and user-assigned identity. #584
[ENHANCEMENT] Added a new metric mimir_build_info to coincide with cortex_build_info. The metric cortex_build_info has not been removed. #1022
[ENHANCEMENT] Mimir runs a sanity check of storage config at startup and will fail to start if the sanity check doesn't pass. This is done to find potential config issues before starting up. #1180
[ENHANCEMENT] Validate alertmanager and ruler storage configurations to ensure they don't use same bucket name and region values as those configured for the blocks storage. #1214
[ENHANCEMENT] Ingester: added option -ingester.readiness-check-ring-health to disable the ring health check in the readiness endpoint. When disabled, the health checks are run against only the ingester itself instead of all ingesters in the ring. #48 #126
[ENHANCEMENT] Ingester: reduce CPU and memory utilization if remote write requests contains a large amount of "out of bounds" samples. #413
[ENHANCEMENT] Ingester: reduce CPU and memory utilization when querying chunks from ingesters. #430
[ENHANCEMENT] Ingester: Expose ingester ring page on ingesters. #654
[ENHANCEMENT] Distributor: added option -distributor.excluded-zones to exclude ingesters running in specific zones both on write and read path. #51
[ENHANCEMENT] Distributor: add tags to tracing span for distributor push with user, cluster and replica. #210
[ENHANCEMENT] Distributor: performance optimisations. #212 #217 #242
[ENHANCEMENT] Distributor: reduce latency when HA-Tracking by doing KVStore updates in the background. #271
[ENHANCEMENT] Distributor: make distributor inflight push requests count include background calls to ingester. #398
[ENHANCEMENT] Distributor: silently drop exemplars more than 5 minutes older than samples in the same batch. #544
[ENHANCEMENT] Distributor: reject exemplars with blank label names or values. The cortex_discarded_exemplars_total metric will use the exemplar_labels_blank reason in this case. #873
[ENHANCEMENT] Query-frontend: added cortex_query_frontend_workers_enqueued_requests_total metric to track the number of requests enqueued in each query-scheduler. #384
[ENHANCEMENT] Query-frontend: added cortex_query_frontend_non_step_aligned_queries_total to track the total number of range queries with start/end not aligned to step. #347 #357 #582
[ENHANCEMENT] Query-scheduler: exported summary cortex_query_scheduler_inflight_requests tracking total number of inflight requests (both enqueued and processing) in percentile buckets. #675
[ENHANCEMENT] Querier: can use the LabelNames call with matchers, if matchers are provided in the /labels API call, instead of using the more expensive MetricsForLabelMatchers call as before. #3 #1186
[ENHANCEMENT] Querier / store-gateway: optimized regex matchers. #319 #334 #355
[ENHANCEMENT] Querier: when fetching data for specific query-shard, we can ignore some blocks based on compactor-shard ID, since sharding of series by query sharding and compactor is the same. Added metrics: #438 #450
- cortex_querier_blocks_found_total
- cortex_querier_blocks_queried_total
- cortex_querier_blocks_with_compactor_shard_but_incompatible_query_shard_total
[ENHANCEMENT] Querier / ruler: reduce cpu usage, latency and peak memory consumption. #459 #463 #589
[ENHANCEMENT] Querier: labels requests now obey -querier.query-ingesters-within, making them a little more efficient. #518
[ENHANCEMENT] Querier: retry store-gateway in case of unexpected failure, instead of failing the query. #1003
[ENHANCEMENT] Querier / ruler: reduce memory used by streaming queries, particularly in ruler. #4341
[ENHANCEMENT] Ruler: Using shuffle sharding subring on GetRules API. #4466
[ENHANCEMENT] Ruler: wait for ruler ring client to self-detect during startup. #990
[ENHANCEMENT] Store-gateway: added cortex_bucket_store_sent_chunk_size_bytes metric, tracking the size of chunks sent from store-gateway to querier. #123
[ENHANCEMENT] Store-gateway: reduced CPU and memory utilization due to exported metrics aggregation for instances with a large number of tenants. #123 #142
[ENHANCEMENT] Store-gateway: added an in-memory LRU cache for chunks attributes. Can be enabled setting -blocks-storage.bucket-store.chunks-cache.attributes-in-memory-max-items=X where X is the max number of items to keep in the in-memory cache. The following new metrics are exposed: #279 #415 #437
- cortex_cache_memory_requests_total
- cortex_cache_memory_hits_total
- cortex_cache_memory_items_count
[ENHANCEMENT] Store-gateway: log index cache requests to tracing spans. #419
[ENHANCEMENT] Store-gateway: store-gateway can now ignore blocks with minimum time within -blocks-storage.bucket-store.ignore-blocks-within duration. Useful when used together with -querier.query-store-after. #502
[ENHANCEMENT] Store-gateway: label values with matchers now doesn't preload or list series, reducing latency and memory consumption. #534
[ENHANCEMENT] Store-gateway: the results of LabelNames(), LabelValues() and Series(skipChunks=true) calls are now cached in the index cache. #590
[ENHANCEMENT] Store-gateway: Added -store-gateway.sharding-ring.unregister-on-shutdown option that allows store-gateway to stay in the ring even after shutdown. Defaults to true, which is the same as current behaviour. #610 #614
[ENHANCEMENT] Store-gateway: wait for ring tokens stability instead of ring stability to speed up startup and tests. #620
[ENHANCEMENT] Compactor: add timeout for waiting on compactor to become ACTIVE in the ring. #4262
[ENHANCEMENT] Compactor: skip already planned compaction jobs if the tenant doesn't belong to the compactor instance anymore. #303
[ENHANCEMENT] Compactor: Blocks cleaner will ignore users that it no longer "owns" when sharding is enabled, and user ownership has changed since last scan. #325
[ENHANCEMENT] Compactor: added -compactor.compaction-jobs-order support to configure which compaction jobs should run first for a given tenant (in case there are multiple ones). Supported values are: smallest-range-oldest-blocks-first (default), newest-blocks-first. #364
[ENHANCEMENT] Compactor: delete blocks marked for deletion faster. #490
[ENHANCEMENT] Compactor: expose low-level concurrency options for compactor: -compactor.max-opening-blocks-concurrency, -compactor.max-closing-blocks-concurrency, -compactor.symbols-flushers-concurrency. #569 #701
[ENHANCEMENT] Compactor: expand compactor logs to include total compaction job time, total time for uploads and block counts. #549
[ENHANCEMENT] Ring: allow experimental configuration of disabling of heartbeat timeouts by setting the relevant configuration value to zero. Applies to the following: #4342
- -distributor.ring.heartbeat-timeout
- -ingester.ring.heartbeat-timeout
- -ruler.ring.heartbeat-timeout
- -alertmanager.sharding-ring.heartbeat-timeout
- -compactor.ring.heartbeat-timeout
- -store-gateway.sharding-ring.heartbeat-timeout
[ENHANCEMENT] Ring: allow heartbeats to be explicitly disabled by setting the interval to zero. This is considered experimental. This applies to the following configuration options: #4344
- -distributor.ring.heartbeat-period
- -ingester.ring.heartbeat-period
- -ruler.ring.heartbeat-period
- -alertmanager.sharding-ring.heartbeat-period
- -compactor.ring.heartbeat-period
- -store-gateway.sharding-ring.heartbeat-period
[ENHANCEMENT] Memberlist: optimized receive path for processing ring state updates, to help reduce CPU utilization in large clusters. #4345
[ENHANCEMENT] Memberlist: expose configuration of memberlist packet compression via -memberlist.compression-enabled. #4346
[ENHANCEMENT] Memberlist: Add -memberlist.advertise-addr and -memberlist.advertise-port options for setting the address to advertise to other members of the cluster to enable NAT traversal. #260
[ENHANCEMENT] Memberlist: reduce CPU utilization for rings with a large number of members. #537 #563 #634
[ENHANCEMENT] Overrides exporter: include additional limits in the per-tenant override exporter. The following limits have been added to the cortex_limit_overrides metric: #21
- max_fetched_series_per_query
- max_fetched_chunk_bytes_per_query
- ruler_max_rules_per_rule_group
- ruler_max_rule_groups_per_tenant
[ENHANCEMENT] Overrides exporter: add a metrics cortex_limits_defaults to expose the default values of limits. #173
[ENHANCEMENT] Overrides exporter: Add max_fetched_chunks_per_query and max_global_exemplars_per_user limits to the default and per-tenant limits exported as metrics. #471 #515
[ENHANCEMENT] Upgrade Go to 1.17.8. #1347 #1381
[ENHANCEMENT] Upgrade Docker base images to alpine:3.15.0. #1348
[BUGFIX] Azure storage: only create HTTP client once, to reduce memory utilization. #605
[BUGFIX] Ingester: fixed ingester stuck on start up (LEAVING ring state) when -ingester.ring.heartbeat-period=0 and -ingester.unregister-on-shutdown=false. #4366
[BUGFIX] Ingester: prevent any reads or writes while the ingester is stopping. This will prevent accessing TSDB blocks once they have been already closed. #4304
[BUGFIX] Ingester: TSDB now waits for pending readers before truncating Head block, fixing the chunk not found error and preventing wrong query results. #16
[BUGFIX] Ingester: don't create TSDB or appender if no samples are sent by a tenant. #162
[BUGFIX] Ingester: fix out-of-order chunks in TSDB head in-memory series after WAL replay in case some samples were appended to TSDB WAL before series. #530
[BUGFIX] Distributor: when cleaning up obsolete elected replicas from KV store, HA tracker didn't update number of cluster per user correctly. #4336
[BUGFIX] Distributor: fix bug in query-exemplar where some results would get dropped. #583
[BUGFIX] Query-frontend: Fixes @ modifier functions (start/end) when splitting queries by time. #206
[BUGFIX] Query-frontend: Ensure query_range requests handled by the query-frontend return JSON formatted errors. #360 #499
[BUGFIX] Query-frontend: don't reuse cached results for queries that are not step-aligned. #424
[BUGFIX] Query-frontend: fix API error messages that were mentioning Prometheus --enable-feature=promql-negative-offset and --enable-feature=promql-at-modifier flags. #688
[BUGFIX] Query-frontend: worker's cancellation channels are now buffered to ensure that all request cancellations are properly handled. #741
[BUGFIX] Querier: fixed /api/v1/user_stats endpoint. When zone-aware replication is enabled, MaxUnavailableZones param is used instead of MaxErrors, so setting MaxErrors = 0 doesn't make the Querier wait for all Ingesters responses. #474
[BUGFIX] Querier: Disable query scheduler SRV DNS lookup. #689
[BUGFIX] Ruler: fixed counting of PromQL evaluation errors as user-errors when updating cortex_ruler_queries_failed_total. #4335
[BUGFIX] Ruler: fix formatting of rule groups in /ruler/rule_groups endpoint. #655
[BUGFIX] Ruler: do not log unable to read rules directory at startup if the directory hasn't been created yet. #1058
[BUGFIX] Ruler: enable Prometheus-compatible endpoints regardless of -ruler.enable-api. The flag now only controls the configuration API. This is what the config flag description stated, but not what was happening. #1216
[BUGFIX] Compactor: fixed panic while collecting Prometheus metrics. #28
[BUGFIX] Compactor: compactor should now be able to correctly mark blocks for deletion and no-compaction, if such marking was previously interrupted. #1015
[BUGFIX] Alertmanager: remove stale template files. #4495
[BUGFIX] Alertmanager: don't replace user configurations with blank fallback configurations (when enabled), particularly during scaling up/down instances when sharding is enabled. #224
[BUGFIX] Ring: multi KV runtime config changes are now propagated to all rings, not just ingester ring. #1047
[BUGFIX] Memberlist: fixed corrupted packets when sending compound messages with more than 255 messages or messages bigger than 64KB. #551
[BUGFIX] Overrides exporter: successfully startup even if runtime config is not set. #1056
[BUGFIX] Fix internal modules to wait for other modules depending on them before stopping. #1472

Mixin

Changes since grafana/cortex-jsonnet 1.9.0.

[CHANGE] Removed chunks storage support from mixin. #641 #643 #645 #811 #812 #813
- Removed tsdb.libsonnet: no need to import it anymore (its content is already automatically included when using Jsonnet)
- Removed the following fields from _config:
  - storage_engine (defaults to blocks)
  - chunk_index_backend
  - chunk_store_backend
- Removed schema config map
- Removed the following dashboards:
  - "Cortex / Chunks"
  - "Cortex / WAL"
  - "Cortex / Blocks vs Chunks"
- Removed the following alerts:
  - CortexOldChunkInMemory
  - CortexCheckpointCreationFailed
  - CortexCheckpointDeletionFailed
  - CortexProvisioningMemcachedTooSmall
  - CortexWALCorruption
  - CortexTableSyncFailure
  - CortexTransferFailed
- Removed the following recording rules:
  - cortex_chunk_store_index_lookups_per_query
  - cortex_chunk_store_series_pre_intersection_per_query
  - cortex_chunk_store_series_post_intersection_per_query
  - cortex_chunk_store_chunks_per_query
  - cortex_bigtable_request_duration_seconds
  - cortex_cassandra_request_duration_seconds
  - cortex_dynamo_request_duration_seconds
  - cortex_database_request_duration_seconds
  - cortex_gcs_request_duration_seconds
[CHANGE] Update grafana-builder dependency: use $__rate_interval in qpsPanel and latencyPanel. #372
[CHANGE] namespace template variable in dashboards now only selects namespaces for selected clusters. #311
[CHANGE] CortexIngesterRestarts alert severity changed from critical to warning. #321
[CHANGE] Dashboards: added overridable job_labels and cluster_labels to the configuration object as label lists to uniquely identify jobs and clusters in the metric names and group-by lists in dashboards. #319
[CHANGE] Dashboards: alert_aggregation_labels has been removed from the configuration and overriding this value has been deprecated. Instead the labels are now defined by the cluster_labels list, and should be overridden accordingly through that list. #319
[CHANGE] Renamed CortexCompactorHasNotUploadedBlocksSinceStart to CortexCompactorHasNotUploadedBlocks. #334
[CHANGE] Renamed CortexCompactorRunFailed to CortexCompactorHasNotSuccessfullyRunCompaction. #334
[CHANGE] Renamed CortexInconsistentConfig alert to CortexInconsistentRuntimeConfig and increased severity to critical. #335
[CHANGE] Increased CortexBadRuntimeConfig alert severity to critical and removed support for cortex_overrides_last_reload_successful metric (was removed in Cortex 1.3.0). #335
[CHANGE] Grafana 'min step' changed to 15s so dashboard show better detail. #340
[CHANGE] Replace CortexRulerFailedEvaluations with two new alerts: CortexRulerTooManyFailedPushes and CortexRulerTooManyFailedQueries. #347
[CHANGE] Removed CortexCacheRequestErrors alert. This alert was not working because the legacy Cortex cache client instrumentation doesn't track errors. #346
[CHANGE] Removed CortexQuerierCapacityFull alert. #342
[CHANGE] Changes blocks storage alerts to group metrics by the configured cluster_labels (supporting the deprecated alert_aggregation_labels). #351
[CHANGE] Increased CortexIngesterReachingSeriesLimit critical alert threshold from 80% to 85%. #363
[CHANGE] Changed default job_names for query-frontend, query-scheduler and querier to match custom deployments too. #376
[CHANGE] Split cortex_api recording rule group into three groups. This is a workaround for large clusters where this group can become slow to evaluate. #401
[CHANGE] Increased CortexIngesterReachingSeriesLimit warning threshold from 70% to 80% and critical threshold from 85% to 90%. #404
[CHANGE] Raised CortexKVStoreFailure alert severity from warning to critical. #493
[CHANGE] Increase CortexRolloutStuck alert "for" duration from 15m to 30m. #493 #573
[CHANGE] The Alertmanager and Ruler compiled dashboards (alertmanager.json and ruler.json) have been respectively renamed to mimir-alertmanager.json and mimir-ruler.json. #869
[CHANGE] Removed cortex_overrides_metric from _config. #871
[CHANGE] Renamed recording rule groups (cortex_ prefix changed to mimir_). #871
[CHANGE] Alerts name prefix has been changed from Cortex to Mimir (eg. alert CortexIngesterUnhealthy has been renamed to MimirIngesterUnhealthy). #879
[CHANGE] Enabled resources dashboards by default. Can be disabled setting resources_dashboards_enabled config field to false. #920
[FEATURE] Added Cortex / Overrides dashboard, displaying default limits and per-tenant overrides applied to Mimir. #673
[FEATURE] Added Mimir / Tenants and Mimir / Top tenants dashboards, displaying user-based metrics. #776
[FEATURE] Added querier autoscaling panels and alerts. #1006 #1016
[FEATURE] Mimir / Top tenants dashboard now has tenants ranked by rule group size and evaluation time. #1338
[ENHANCEMENT] cortex-mixin: Make cluster_namespace_deployment:kube_pod_container_resource_requests_{cpu_cores,memory_bytes}:sum backwards compatible with kube-state-metrics v2.0.0. #317
[ENHANCEMENT] Cortex-mixin: Include cortex-gw-internal naming variation in default gateway job names. #328
[ENHANCEMENT] Ruler dashboard: added object storage metrics. #354
[ENHANCEMENT] Alertmanager dashboard: added object storage metrics. #354
[ENHANCEMENT] Added documentation text panels and descriptions to reads and writes dashboards. #324
[ENHANCEMENT] Dashboards: defined container functions for common resources panels: containerDiskWritesPanel, containerDiskReadsPanel, containerDiskSpaceUtilization. #331
[ENHANCEMENT] cortex-mixin: Added alert_excluded_routes config to exclude specific routes from alerts. #338
[ENHANCEMENT] Added CortexMemcachedRequestErrors alert. #346
[ENHANCEMENT] Ruler dashboard: added "Per route p99 latency" panel in the "Configuration API" row. #353
[ENHANCEMENT] Increased the for duration of the CortexIngesterReachingSeriesLimit warning alert to 3h. #362
[ENHANCEMENT] Added a new tier (medium_small_user) so we have another tier between 100K and 1Mil active series. #364
[ENHANCEMENT] Extend Alertmanager dashboard: #313
- "Tenants" stat panel - shows number of discovered tenant configurations.
- "Replication" row - information about the replication of tenants/alerts/silences over instances.
- "Tenant Configuration Sync" row - information about the configuration sync procedure.
- "Sharding Initial State Sync" row - information about the initial state sync procedure when sharding is enabled.
- "Sharding Runtime State Sync" row - information about various state operations which occur when sharding is enabled (replication, fetch, marge, persist).
[ENHANCEMENT] Update gsutil command for not healthy index found playbook #370
[ENHANCEMENT] Added Alertmanager alerts and playbooks covering configuration syncs and sharding operation: [#377 #378
- CortexAlertmanagerSyncConfigsFailing
- CortexAlertmanagerRingCheckFailing
- CortexAlertmanagerPartialStateMergeFailing
- CortexAlertmanagerReplicationFailing
- CortexAlertmanagerPersistStateFailing
- CortexAlertmanagerInitialSyncFailed
[ENHANCEMENT] Add recording rules to improve responsiveness of Alertmanager dashboard. #387
[ENHANCEMENT] Add CortexRolloutStuck alert. #405
[ENHANCEMENT] Added CortexKVStoreFailure alert. #406
[ENHANCEMENT] Use configured ruler jobname for ruler dashboard panels. #409
[ENHANCEMENT] Add ability to override datasource for generated dashboards. #407
[ENHANCEMENT] Use alertmanager jobname for alertmanager dashboard panels #411
[ENHANCEMENT] Added CortexDistributorReachingInflightPushRequestLimit alert. #408
[ENHANCEMENT] Added CortexReachingTCPConnectionsLimit alert. #403
[ENHANCEMENT] Added "Cortex / Writes Networking" and "Cortex / Reads Networking" dashboards. #405
[ENHANCEMENT] Improved "Queue length" panel in "Cortex / Queries" dashboard. #408
[ENHANCEMENT] Add CortexDistributorReachingInflightPushRequestLimit alert and playbook. #401
[ENHANCEMENT] Added "Recover accidentally deleted blocks (Google Cloud specific)" playbook. #475
[ENHANCEMENT] Added support to multi-zone store-gateway deployments. #608 #615
[ENHANCEMENT] Show supplementary alertmanager services in the Rollout Progress dashboard. #738 #855
[ENHANCEMENT] Added mimir to default job names. This makes dashboards and alerts working when Mimir is installed in single-binary mode and the deployment is named mimir. #921
[ENHANCEMENT] Introduced a new alert for the Alertmanager: MimirAlertmanagerAllocatingTooMuchMemory. It has two severities based on the memory usage against limits, a warning level at 80% and a critical level at 90%. #1206
[BUGFIX] Fixed CortexIngesterHasNotShippedBlocks alert false positive in case an ingester instance had ingested samples in the past, then no traffic was received for a long period and then it started receiving samples again. #308
[BUGFIX] Fixed CortexInconsistentRuntimeConfig metric. #335
[BUGFIX] Fixed scaling dashboard to correctly work when a Cortex service deployment spans across multiple zones (a zone is expected to have the zone-[a-z] suffix). #365
[BUGFIX] Fixed rollout progress dashboard to correctly work when a Cortex service deployment spans across multiple zones (a zone is expected to have the zone-[a-z] suffix). #366
[BUGFIX] Fixed rollout progress dashboard to include query-scheduler too. #376
[BUGFIX] Upstream recording rule node_namespace_pod_container:container_cpu_usage_seconds_total:sum_irate renamed. #379
[BUGFIX] Fixed writes/reads/alertmanager resources dashboards to use $._config.job_names.gateway. #403
[BUGFIX] Span the annotation.message in alerts as YAML multiline strings. #412
[BUGFIX] Fixed "Instant queries / sec" in "Cortex / Reads" dashboard. #445
[BUGFIX] Fixed and added missing KV store panels in Writes, Reads, Ruler and Compactor dashboards. #448
[BUGFIX] Fixed Alertmanager dashboard when alertmanager is running as part of single binary. #1064
[BUGFIX] Fixed Ruler dashboard when ruler is running as part of single binary. #1260
[BUGFIX] Query-frontend: fixed bad querier status code mapping with query-sharding enabled. #1227

Jsonnet

Changes since grafana/cortex-jsonnet 1.9.0.

[CHANGE] Removed chunks storage support. #639
- Removed the following fields from _config:
  - storage_engine (defaults to blocks)
  - querier_second_storage_engine (not supported anymore)
  - table_manager_enabled, table_prefix
  - memcached_index_writes_enabled and memcached_index_writes_max_item_size_mb
  - storeMemcachedChunksConfig
  - storeConfig
  - max_chunk_idle
  - schema (the schema configmap is still added for backward compatibility reasons)
  - bigtable_instance and bigtable_project
  - client_configs
  - enabledBackends
  - storage_backend
  - cassandra_addresses
  - s3_bucket_name
  - ingester_deployment_without_wal (was only used by chunks storage)
  - ingester (was only used to configure chunks storage WAL)
- Removed the following CLI flags from ingester_args:
  - ingester.max-chunk-age
  - ingester.max-stale-chunk-idle
  - ingester.max-transfer-retries
  - ingester.retain-period
[CHANGE] Changed overrides-exporter.libsonnet from being based on cortex-tools to Mimir overrides-exporter target. #646
[CHANGE] Store gateway: set -blocks-storage.bucket-store.index-cache.memcached.max-get-multi-concurrency, -blocks-storage.bucket-store.chunks-cache.memcached.max-get-multi-concurrency, -blocks-storage.bucket-store.metadata-cache.memcached.max-get-multi-concurrency, -blocks-storage.bucket-store.index-cache.memcached.max-idle-connections, -blocks-storage.bucket-store.chunks-cache.memcached.max-idle-connections, -blocks-storage.bucket-store.metadata-cache.memcached.max-idle-connections to 100 #414
[CHANGE] Alertmanager: mounted overrides configmap to alertmanager too. #315
[CHANGE] Memcached: upgraded memcached from 1.5.17 to 1.6.9. #316
[CHANGE] Store-gateway: increased memory request and limit respectively from 6GB / 6GB to 12GB / 18GB. #322
[CHANGE] Store-gateway: increased -blocks-storage.bucket-store.max-chunk-pool-bytes from 2GB (default) to 12GB. #322
[CHANGE] Ingester/Ruler: set -server.grpc-max-send-msg-size-bytes and -server.grpc-max-send-msg-size-bytes to sensible default values (10MB). #326
[CHANGE] Decreased -server.grpc-max-concurrent-streams from 100k to 10k. #369
[CHANGE] Decreased blocks storage ingesters graceful termination period from 80m to 20m. #369
[CHANGE] Increase the rules per group and rule groups limits on different tiers. #396
[CHANGE] Removed max_samples_per_query limit, since it only works with chunks and only when using -distributor.shard-by-all-labels=false. #397
[CHANGE] Removed chunks storage query sharding config support. The following config options have been removed: #398
- _config > queryFrontend > shard_factor
- _config > queryFrontend > sharded_queries_enabled
- _config > queryFrontend > query_split_factor
[CHANGE] Rename ruler_s3_bucket_name and ruler_gcs_bucket_name to ruler_storage_bucket_name: #415
[CHANGE] Fine-tuned rolling update policy for distributor, querier, query-frontend, query-scheduler. #420
[CHANGE] Increased memcached metadata/chunks/index-queries max connections from 4k to 16k. #420
[CHANGE] Disabled step alignment in query-frontend to be compliant with PromQL. #420
[CHANGE] Do not limit compactor CPU and request a number of cores equal to the configured concurrency. #420
[CHANGE] Configured split-and-merge compactor. #853
- The following CLI flags are set on compactor:
  - -compactor.split-and-merge-shards=0
  - -compactor.compactor-tenant-shard-size=1
  - -compactor.split-groups=1
  - -compactor.max-opening-blocks-concurrency=4
  - -compactor.max-closing-blocks-concurrency=2
  - -compactor.symbols-flushers-concurrency=4
- The following per-tenant overrides have been set on super_user and mega_user classes:
```
compactor_split_and_merge_shards: 2,
compactor_tenant_shard_size: 2,
compactor_split_groups: 2,
```
[CHANGE] The entrypoint file to include has been renamed from cortex.libsonnet to mimir.libsonnet. #897
[CHANGE] The default image config field has been renamed from cortex to mimir. #896
```
{
  _images+:: {
    mimir: '...',
  },
}
```
[CHANGE] Removed cortex_ prefix from config fields. #898
- The following config fields have been renamed:
  - cortex_bucket_index_enabled renamed to bucket_index_enabled
  - cortex_compactor_cleanup_interval renamed to compactor_cleanup_interval
  - cortex_compactor_data_disk_class renamed to compactor_data_disk_class
  - cortex_compactor_data_disk_size renamed to compactor_data_disk_size
  - cortex_compactor_max_concurrency renamed to compactor_max_concurrency
  - cortex_distributor_allow_multiple_replicas_on_same_node renamed to distributor_allow_multiple_replicas_on_same_node
  - cortex_ingester_data_disk_class renamed to ingester_data_disk_class
  - cortex_ingester_data_disk_size renamed to ingester_data_disk_size
  - cortex_querier_allow_multiple_replicas_on_same_node renamed to querier_allow_multiple_replicas_on_same_node
  - cortex_query_frontend_allow_multiple_replicas_on_same_node renamed to query_frontend_allow_multiple_replicas_on_same_node
  - cortex_query_sharding_enabled renamed to query_sharding_enabled
  - cortex_query_sharding_msg_size_factor renamed to query_sharding_msg_size_factor
  - cortex_ruler_allow_multiple_replicas_on_same_node renamed to ruler_allow_multiple_replicas_on_same_node
  - cortex_store_gateway_data_disk_class renamed to store_gateway_data_disk_class
  - cortex_store_gateway_data_disk_size renamed to store_gateway_data_disk_size
[CHANGE] The overrides configmap default mountpoint has changed from /etc/cortex to /etc/mimir. It can be customized via the overrides_configmap_mountpoint config field. #899
[CHANGE] Enabled in the querier the features to query label names with matchers, PromQL at modifier and query long-term storage for labels. #905
[CHANGE] Reduced TSDB blocks retention on ingesters disk from 96h to 24h. #905
[CHANGE] Enabled closing of idle TSDB in ingesters. #905
[CHANGE] Disabled TSDB isolation in ingesters for better performances. #905
[CHANGE] Changed log level of querier, query-frontend, query-scheduler and alertmanager from debug to info. #905
[CHANGE] Enabled attributes in-memory cache in store-gateway. #905
[CHANGE] Configured store-gateway to not load blocks containing samples more recent than 10h (because such samples are queried from ingesters). #905
[CHANGE] Dynamically compute -compactor.deletion-delay based on other settings, in order to reduce the deletion delay as much as possible and lower the number of live blocks in the storage. #907
[CHANGE] The config field distributorConfig has been renamed to ingesterRingClientConfig. Config field ringClient has been removed in favor of ingesterRingClientConfig. #997 #1057
[CHANGE] Gossip.libsonnet has been fixed to modify all ring configurations, not only the ingester ring config. Furthermore it now supports migration via multi KV store. #1057 #1099
[CHANGE] Changed the default of bucket_index_enabled to true. #924
[CHANGE] Remove the support for the test-exporter. #1133
[CHANGE] Removed $.distributor_deployment_labels, $.ingester_deployment_labels and $.querier_deployment_labels fields, that were used by gossip.libsonnet to inject additional label. Now the label is injected directly into pods of statefulsets and deployments. #1297
[CHANGE] Disabled -ingester.readiness-check-ring-health. #1352
[CHANGE] Changed Alertmanager CPU request from 100m to 2 cores, and memory request from 1Gi to 10Gi. Set Alertmanager memory limit to 15Gi. #1206
[CHANGE] gossip.libsonnet has been renamed to memberlist.libsonnet, and is now imported by default. Use of memberlist for ring is enabled by setting _config.memberlist_ring_enabled to true. #1526
[FEATURE] Added query sharding support. It can be enabled setting cortex_query_sharding_enabled: true in the _config object. #653

[FEATURE] Added shuffle-sharding support. It can be enabled and configured using the following config: #902

_config+:: {
  shuffle_sharding:: {
    ingester_write_path_enabled: true,
    ingester_read_path_enabled: true,
    querier_enabled: true,
    ruler_enabled: true,
    store_gateway_enabled: true,
  },
}

[FEATURE] Added multi-zone ingesters and store-gateways support. #1352 #1552
[ENHANCEMENT] Add overrides config to compactor. This allows setting retention configs per user. #386
[ENHANCEMENT] Added 256MB memory ballast to querier. #369
[ENHANCEMENT] Update etcd-operator to latest version (see grafana/jsonnet-libs#480). #263
[ENHANCEMENT] Add support for Azure storage in Alertmanager configuration. #381
[ENHANCEMENT] Add support for running Alertmanager in sharding mode. #394
[ENHANCEMENT] Allow to customize PromQL engine settings via queryEngineConfig. #399
[ENHANCEMENT] Define Azure object storage ruler args. #416
[ENHANCEMENT] Added the following config options to allow to schedule multiple replicas of the same service on the same node: #418
- cortex_distributor_allow_multiple_replicas_on_same_node
- cortex_ruler_allow_multiple_replicas_on_same_node
- cortex_querier_allow_multiple_replicas_on_same_node
- cortex_query_frontend_allow_multiple_replicas_on_same_node
[BUGFIX] Alertmanager: fixed --alertmanager.cluster.peers CLI flag passed to alertmanager when HA is enabled. #329
[BUGFIX] Fixed -distributor.extend-writes setting on ruler when unregister_ingesters_on_shutdown is disabled. #369
[BUGFIX] Treat compactor_blocks_retention_period type as string rather than int.#395
[BUGFIX] Pass -ruler-storage.s3.endpoint to ruler when using S3. #421
[BUGFIX] Remove service selector on label gossip_ring_member from other services than gossip-ring. #1008
[BUGFIX] Rename -ingester.readiness-check-ring-health to -ingester.ring.readiness-check-ring-health, to reflect current name of flag. #1460