Propagate annotations to the StatefulSet (#932)

* Initial commit

* Corrections

- set the type of the new  configuration parameter to be array of
  strings
- propagate the annotations to statefulset at sync

* Enable regular expression matching

* Improvements

-handle rollingUpdate flag
-modularize code
-rename config parameter name

* fix merge error

* Pass annotations to connection pooler deployment

* update code-gen

* Add documentation and update manifests

* add e2e test and introduce option in configmap

* fix service annotations test

* Add unit test

* fix e2e tests

* better key lookup of annotations tests

* add debug message for annotation tests

* Fix typos

* minor fix for looping

* Handle update path and renaming

- handle the update path to update sts and connection pooler deployment.
  This way no need to wait for sync
- rename the parameter to downscaler_annotations
- handle other review comments

* another try to fix python loops

* Avoid unneccessary update events

* Update manifests

* some final polishing

* fix cluster_test after polishing

Co-authored-by: Rafia Sabih <rafia.sabih@zalando.de>
Co-authored-by: Felix Kunde <felix-kunde@gmx.de>

charts/postgres-operator/crds/operatorconfigurations.yaml

@@ -117,6 +117,10 @@ spec:
                   type: object
                   additionalProperties:
                     type: string
+                downscaler_annotations:
+                  type: array
+                  items:
+                    type: string
                 enable_init_containers:
                   type: boolean
                 enable_pod_antiaffinity:

charts/postgres-operator/values-crd.yaml

@@ -67,6 +67,11 @@ configKubernetes:
   #   keya: valuea
   #   keyb: valueb
 
+  # list of annotations propagated from cluster manifest to statefulset and deployment 
+  # downscaler_annotations:
+  #   - deployment-time
+  #   - downscaler/*
+
   # enables initContainers to run actions before Spilo is started
   enable_init_containers: true
   # toggles pod anti affinity on the Postgres pods
@@ -262,11 +267,11 @@ configConnectionPooler:
   # docker image
   connection_pooler_image: "registry.opensource.zalan.do/acid/pgbouncer"
   # max db connections the pooler should hold
-  connection_pooler_max_db_connections: "60"
+  connection_pooler_max_db_connections: 60
   # default pooling mode
   connection_pooler_mode: "transaction"
   # number of pooler instances
-  connection_pooler_number_of_instances: "2"
+  connection_pooler_number_of_instances: 2
   # default resources
   connection_pooler_default_cpu_request: 500m
   connection_pooler_default_memory_request: 100Mi

charts/postgres-operator/values.yaml

@@ -63,6 +63,9 @@ configKubernetes:
   # annotations attached to each database pod
   # custom_pod_annotations: "keya:valuea,keyb:valueb"
 
+  # list of annotations propagated from cluster manifest to statefulset and deployment
+  # downscaler_annotations: "deployment-time,downscaler/*"
+
   # enables initContainers to run actions before Spilo is started
   enable_init_containers: "true"
   # toggles pod anti affinity on the Postgres pods