Version 1.26.0

This release represents the release candidate ("RC") release for the Logs Bridge API / SDK. In the next release (1.27.0), opentelemetry-api-logs will be merged into opentelemetry-api, opentelemetry-sdk-logs will be marked as stable, opentelemetry-exporter-otlp-logs will be merged into opentelemetry-exporter-otlp, opentelemetry-sdk-logs-testing will be merged into opentelemetry-sdk-testing, opentelemetry-sdk-extension-autoconfigure will enable otlp log exporter by default (i.e. otel.logs.exporter=otlp). For more details, see tracking issue #5340. NOTE: reminder that the Logs Bridge API is not meant for end users. Log appenders use the API to bridge logs from existing log frameworks (e.g. JUL, Log4j, SLf4J, Logback) into OpenTelemetry. Users configure the Log SDK to dictate how logs are processed and exported.

opentelemetry-opentracing-shim is now stable!

SDK

• Create OtelVersion class at build time which is used to resolve artifact version in Resource. (#5365)

Metrics

• Add prototype histogram advice API (i.e. Hints). (#5217)

Logs

• Add LogRecord observed timestamp field. (#5370)
• Remove log record timestamp default. (#5374)
• Align BatchLogRecordProcessor defaults with specification. (#5364)
• Rename setEpoch to setTimestamp. (#5368)
• Log SDK cleanup. Move InMemoryLogRecordExporter to opentelemetry-sdk-logs-testing. Rename InMemoryLogRecordExporter#getFinishedLogItems to getFinishedLogRecordItems. Move SdkEventEmitterProvder to internal package. (#5368)

Exporters

• Add scaffolding for low level exporter TLS API. (#5362)
• Add new low level TLS APIs on OTLP and Jaeger gRPC exporter builders. (#5280, #5422)
• OTLP LogRecord exporters serialize observed timestamp. (#5382)
• Update prometheus test to reflect new collector behavior. (#5417)
• Prometheus exporter checks metrics name to prevent add duplicated _total suffix. (#5308)
• Add additional OTLP test for authenticator. (#5391)

OpenTracing Shim

• Mark opentracing-shim as stable. (#5371)

SDK Extensions

• Fixes jaeger remote sampler service strategies bug resolving service name. (#5418)
• Fix flaky JaegerRemoteSamplerGrpcNettyTest. (#5385)
• Add new log level TLS APIs on JaegerRemoteSamplerBuilder. (#5422)
• Fix a parameter name typo in autoconfigure-spi module. (#5409)

Semantic Conventinos

• Add missing links to deprecated constants in SemanticAttributes. (#5406)

Project Tooling

• Update stale workflow. (#5381)
• Skip OWASP dependencyCheck on test modules. (#5383)
• Skip OWASP dependencyCheck on jmh tasks. (#5384)
• Drop create website pull request release step (#5361)

🙇 Thank you

This release was possible thanks to the following contributors who shared their brilliant ideas and awesome pull requests:

@breedx-splk
@carlosalberto
@chicobento
@chukunx
@DondekarShraddha
@Donnerbart
@jack-berg
@jkwatson
@mateuszrzeszutek
@ShadowySpirits
@trask
@tylerbenson