PodDisruptionBudget and TopologySpreadContraints for better HA configuration

[jkleinlercher]

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Checklist

• I've searched the issue queue to verify this is not a duplicate feature request.
• I've pasted the output of kargo version, if applicable.
• I've pasted logs, if applicable.

Proposed Feature

We configure Kargo for HA requirements (not fully distributed topology) and currently our HA specific settings are:

  api:
    replicas: 2
  externalWebhooksServer:
    replicas: 2
  webhooksServer:
    replicas: 2

However, for a stable HA configuration we think we would also need a PodDisruptionBudget and TopologySpreadContraints, so that the replicas are spread across different nodes (maybe also AZs) and the PDB takes care that at least on replica is running.

What do you think? Is this already planned? If not - and you think PDBs and TopologySpreadContraints are the things to achieve good HA - I could create a PR for it.

Motivation

Anyone who wants to set up Kargo in HA mode.

[aryasoni98]

@jkleinlercher I’m thrilled to work on this! Could you please assign the issue to me?

[jkleinlercher]

@aryasoni98 I do not have permissions to assign it. I guess only someone of akuity can, maybe @krancour ?