feat: Since replicaCount is 2 by default, `podDisruptionBudget.maxUnavailable: 1` also be set by default.

[kahirokunn]

Issue

Description

If podDisruptionBudget is set by default, Scale-in is enabled when using Cluster Autoscaler. I think cheap by default is good.

Checklist

• [ ] Added tests that cover your change (if possible)
• [ ] Added/modified documentation as required (such as the README.md, or the docs directory)
• [x] Manually tested
• [ ] Made sure the title of the PR is a good description that can go into the release notes

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• [ ] Backfilled missing tests for code in same general area :tada:
• [ ] Refactored something and made the world a better place :star2:

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• :white_check_mark: login: kahirokunn (197bf76df6b61228e32d293008053d0358fa8212)

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[APPROVALNOTIFIER] This PR is NOT APPROVED

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Codecov Report

Merging #2760 (3101415) into main (6d3e976) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #2760   +/-   ##
=======================================
  Coverage   54.04%   54.04%           
=======================================
  Files         144      144           
  Lines        8223     8223           
=======================================
  Hits         4444     4444           
  Misses       3461     3461           
  Partials      318      318           

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[kishorj]

@kahirokunn, thanks for your contribution. However, the pod disruption budget is an optional feature and at the moment we don't want to enforce it by default. Since there are possible consequences, we will let the end user make the appropriate choice for now in regards to this feature.

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/lifecycle stale

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/lifecycle rotten

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/close

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@k8s-triage-robot: Closed this PR.

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/close

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