Auto-delete workflows on archive

[danxmoran]

Summary

During the community meeting, I believe something was mentioned like "once a workflow is archived, you can go in and delete it". I think it'd be nice to have a config toggle that makes the behavior automatic.

Motivation

My workflows generate ~large persistent volumes, with ownership set so the volumes get deleted when the workflow is deleted. It'd be ideal if I could configure the Argo server to:

1. Auto-archive workflows as they succeed (Ability to only archive workflows in a certain state #2000)
2. Auto-delete archived workflows

That way volumes get cleaned up automatically in the happy path, but they're kept around for retries when things fail.

Proposal

I'm not sure about the internals, but at the config level I'd expect to see something like this:

persistence:
  archive:
    # Default: false
    autoDelete: true

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Message from the maintainers:

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[simster7]

cc @alexec

[alexec]

@jessesuen can this be done using TTL?

[jessesuen]

Yes, this can be done using the spec.ttlStrategy feature in v2.5, or spec.ttlTimeAfterFinished prior to v2.5.

That said, I think there might be a feature in here where the controller could be configured with a "default" ttlStrategy so that all workflows fall back to (if not specified in the spec). In this case, workflows which wish to not auto-delete is could be specified as:

spec:
  ttlStrategy: {}

[tooptoop4]

can this be closed? already implemented i believe