[Feature Request]: DN readiness probe

[aylei]

Is there an existing issue for the same feature request?

• [X] I have checked the existing issues.

Is your feature request related to a problem?

DN is rolling-upgraded and get ready after the process successfully, but actually DN is still launching the logtail server and not able to serve request.

kg po -n $NS
NAME                             READY   STATUS    RESTARTS        AGE
default-cn-856lm                 1/1     Running   3 (3h28m ago)   11h
default-cn-cs5gz                 1/1     Running   3 (99m ago)     11h
default-cn-cvj9n                 1/1     Running   1 (7m12s ago)   17m
default-cn-fs7fr                 1/1     Running   1 (6m19s ago)   15m
default-dn-0                     1/1     Running   5 (16m ago)     6d21h

Describe the feature you'd like

Add readiness gate to DN which indicates the logtail status

Describe implementation you've considered

No response

Documentation, Adoption, Use Case, Migration Strategy

No response

Additional information

No response