better backwards compatibility with old DNS name format for LBs (#2171)

* better backwards compatibility with legacy DNS name format for LBs
* improve docs on DNS string

manifests/configmap.yaml

@@ -97,6 +97,7 @@ data:
   major_version_upgrade_mode: "manual"
   # major_version_upgrade_team_allow_list: ""
   master_dns_name_format: "{cluster}.{namespace}.{hostedzone}"
+  # master_legacy_dns_name_format: "{cluster}.{team}.{hostedzone}"
   # master_pod_move_timeout: 20m
   # max_instances: "-1"
   # min_instances: "-1"
@@ -135,6 +136,7 @@ data:
   ready_wait_timeout: 30s
   repair_period: 5m
   replica_dns_name_format: "{cluster}-repl.{namespace}.{hostedzone}"
+  # replica_legacy_dns_name_format: "{cluster}-repl.{team}.{hostedzone}"
   replication_username: standby
   resource_check_interval: 3s
   resource_check_timeout: 10m

manifests/operatorconfiguration.crd.yaml

@@ -432,9 +432,15 @@ spec:
                   master_dns_name_format:
                     type: string
                     default: "{cluster}.{namespace}.{hostedzone}"
+                  master_legacy_dns_name_format:
+                    type: string
+                    default: "{cluster}.{team}.{hostedzone}"
                   replica_dns_name_format:
                     type: string
                     default: "{cluster}-repl.{namespace}.{hostedzone}"
+                  replica_legacy_dns_name_format:
+                    type: string
+                    default: "{cluster}-repl.{team}.{hostedzone}"
               aws_or_gcp:
                 type: object
                 properties:

manifests/postgresql-operator-default-configuration.yaml

@@ -137,7 +137,9 @@ configuration:
     enable_replica_pooler_load_balancer: false
     external_traffic_policy: "Cluster"
     master_dns_name_format: "{cluster}.{namespace}.{hostedzone}"
+    # master_legacy_dns_name_format: "{cluster}.{team}.{hostedzone}"
     replica_dns_name_format: "{cluster}-repl.{namespace}.{hostedzone}"
+    # replica_dns_old_name_format: "{cluster}-repl.{team}.{hostedzone}"
   aws_or_gcp:
     # additional_secret_mount: "some-secret-name"
     # additional_secret_mount_path: "/some/dir"