Generate a PDB for each ISBServiceRollout

[whynowy]

Summary

For each InterStepBufferService generated by ISBServiceRollout, we need a PDB. A sample PDB looks like below:

apiVersion: policy/v1
kind: PodDisruptionBudget
metadata:
  name: isbsvc-default-pdb
spec:
  maxUnavailable: 1
  selector:
    matchLabels:
      app.kubernetes.io/component: isbsvc
      numaflow.numaproj.io/isbsvc-name: my-isbsvc

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Message from the maintainers:

If you wish to see this enhancement implemented please add a 👍 reaction to this issue! We often sort issues this way to know what to prioritize.

[vigith]

should we do this at the traspiler phase? If it is at transpiler, we can even enforce anti-affinity for multi-az deployments. This could make the scope of Numarollouts lean.

[whynowy]

should we do this at the traspiler phase? If it is at transpiler, we can even enforce anti-affinity for multi-az deployments. This could make the scope of Numarollouts lean.

Makes sense. Closing this for now, we can reopen it if we want to re-visit it.

[whynowy]

Reopen it based on feedback.