Integrate Patroni 4.x (zalando#1050)

* Integrate Patroni v4.x
* set docs
* update to latest patroni version

ENVIRONMENT.rst

@@ -101,7 +101,9 @@ Environment Configuration Settings
 - **LOG_GROUP_BY_DATE**: (optional) enable grouping log by date. Default is False - group the log files based on the instance ID.
 - **DCS_ENABLE_KUBERNETES_API**: a non-empty value forces Patroni to use Kubernetes as a DCS. Default is empty.
 - **KUBERNETES_USE_CONFIGMAPS**: a non-empty value makes Patroni store its metadata in ConfigMaps instead of Endpoints when running on Kubernetes. Default is empty.
-- **KUBERNETES_ROLE_LABEL**: name of the label containing Postgres role when running on Kubernetens. Default is 'spilo-role'.
+- **KUBERNETES_ROLE_LABEL**: name of the label containing Postgres role when running on Kubernetes. Default is 'spilo-role'.
+- **KUBERNETES_LEADER_LABEL_VALUE**: value of the pod label if Postgres role is primary when running on Kubernetes. Default is 'master'.
+- **KUBERNETES_STANDBY_LEADER_LABEL_VALUE**: value of the pod label if Postgres role is standby_leader when running on Kubernetes. Default is 'master'.
 - **KUBERNETES_SCOPE_LABEL**: name of the label containing cluster name. Default is 'version'.
 - **KUBERNETES_LABELS**: a JSON describing names and values of other labels used by Patroni on Kubernetes to locate its metadata. Default is '{"application": "spilo"}'.
 - **INITDB_LOCALE**: database cluster's default UTF-8 locale (en_US by default)

kubernetes/spilo_kubernetes.yaml

@@ -79,6 +79,10 @@ spec:
           value: spilo-cluster
         - name: KUBERNETES_ROLE_LABEL
           value: role
+        - name: KUBERNETES_LEADER_LABEL_VALUE
+          value: master
+        - name: KUBERNETES_STANDBY_LEADER_LABEL_VALUE
+          value: master
         - name: SPILO_CONFIGURATION
           value: | ## https://github.com/zalando/patroni#yaml-configuration
             bootstrap:

postgres-appliance/Dockerfile

@@ -73,7 +73,7 @@ COPY --from=dependencies-builder /builddeps/wal-g /usr/local/bin/
 COPY build_scripts/patroni_wale.sh build_scripts/compress_build.sh /builddeps/
 
 # Install patroni and wal-e
-ENV PATRONIVERSION=3.3.4
+ENV PATRONIVERSION=4.0.4
 ENV WALE_VERSION=1.1.1
 
 WORKDIR /

postgres-appliance/scripts/configure_spilo.py

@@ -578,6 +578,8 @@ def get_placeholders(provider):
     placeholders.setdefault('CALLBACK_SCRIPT', '')
     placeholders.setdefault('DCS_ENABLE_KUBERNETES_API', '')
     placeholders.setdefault('KUBERNETES_ROLE_LABEL', 'spilo-role')
+    placeholders.setdefault('KUBERNETES_LEADER_LABEL_VALUE', 'master')
+    placeholders.setdefault('KUBERNETES_STANDBY_LEADER_LABEL_VALUE', 'master')
     placeholders.setdefault('KUBERNETES_SCOPE_LABEL', 'version')
     placeholders.setdefault('KUBERNETES_LABELS', KUBERNETES_DEFAULT_LABELS)
     placeholders.setdefault('KUBERNETES_USE_CONFIGMAPS', '')