Label spilo-role=replica appears in 20-40 second after the cluster is Ready

[telepenin]

Seems the replica is unavailable first time when the cluster is Ready after increasing replicas.

How to reproduce:

• install latest postgresql operator (v1.6.3 at this moment)
• using postgres-operator/manifests/minimal-postgres-manifest.yaml with numberOfInstances: 1
• apply and wait the cluster is Ready status
• increase numberOfInstances -> 2
• The fast way to see that -> watch kubectl get pg -w and k get pod -l application=spilo --show-labels -w. I'm facing with this issue when I write test to check replica after increasing numberOfInstances. So I need the first wait status is Ready, the second wait the label: spilo-role=replica and only after way replica exactly be available.

operator log - https://pastebin.com/aqu4b9M9

Which image of the operator are you using? Using the latest master's configuration
Where do you run it: cloud/kvm - minikube, cloud/kvm - k3s
Are you running Postgres Operator in production? no, but faced it on the k3s deploy
Type of issue? Bug report

[FxKu]

This is expected behaviour. First Postgres starts up, then it receives the label from Patroni. There have been questions before on K8s probes but so far we either have (readiness) or want (liveness) them.