skip subresource in resource discovery

[27149chen]

Please add a summary of your change

skip subresource in resource discovery

Does your change fix a particular issue?

Fixes #6636

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• Accepted the DCO. Commits without the DCO will delay acceptance.
• Created a changelog file or added /kind changelog-not-required as a comment on this pull request.
• Updated the corresponding documentation in site/content/docs/main.

[codecov]

Codecov Report

Merging #6635 (0f9e582) into main (a88cb46) will increase coverage by 0.00%.
The diff coverage is 66.66%.

@@           Coverage Diff           @@
##             main    #6635   +/-   ##
=======================================
  Coverage   60.18%   60.18%           
=======================================
  Files         242      242           
  Lines       25711    25722   +11     
=======================================
+ Hits        15474    15481    +7     
- Misses       9156     9160    +4     
  Partials     1081     1081           

Files Changed	Coverage Δ
pkg/discovery/helper.go	69.00% <66.66%> (-0.37%)	⬇️

[reasonerjt]

I think it would be pretty safe to skip /status subresources, but we should double check whether we wanna skip ALL subresources.

Labeling it as defer-candidate as it may be out of v1.12.0 release.

[27149chen]

I think it would be pretty safe to skip /status subresources, but we should double check whether we wanna skip ALL subresources.

Labeling it as defer-candidate as it may be out of v1.12.0 release.

yes, we should skip ALL, because the RESTMapper we use skip ALL subresources, see https://github.com/kubernetes/client-go/blob/2c8128c8fba0146d0694cc8507e0527dde476101/restmapper/discovery.go#L103C4-L103C4
A backup will fail when calling .discoveryHelper.ResourceFor() for any subresources