Labeler always correctly adds expected label, but sometimes then incorrectly immediately and unexpectedly removes the label

[sideshowbarker]

For MDN we’re using v2.5 to label just new issues (not to re-label existing ones) and it works as expected almost all the time — but occasionally it will unexpectedly remove a label it has just added.

mdn/content#16309 (comment) is an example.

The relevant config files are here:

• https://github.com/mdn/content/blob/main/.github/workflows/issue-regex-labeler.yml
• https://github.com/mdn/content/blob/main/.github/issue-regex-labeler.yml

https://gist.github.com/sideshowbarker/c25f8f87747c68d0409c14db9b56bcd9 is a copy of the raw log for the workflow run.

In looking at that log, I notice that while there’s an event logged for when the expected label is added, there’s actually no event logged that shows it being removed.

Note that in addition to github/issue-labeler, we also run andymckay/labeler, to do just one thing: add a needs-triage label.

The config file for that is at https://github.com/mdn/content/blob/main/.github/workflows/new-issues.yml

[stephanmiehe]

@sideshowbarker please try v2.6 and let us know if this is still an issue

[sideshowbarker]

@sideshowbarker please try v2.6 and let us know if this is still an issue

Along with upgrading to v2.6+, do we need to manually set sync-labels: 0 to prevent this issues?

[wavingtowaves]

@sideshowbarker I'm having the same issue as you with this action. Can you describe what worked for you to resolve this?

I'm currently using github/issue-labeler@v2.5 and sync-labels: 0 and sync-labels: 1 both remove pre-existing labels if regex doesn't match exactly.