[GitHub] which label should be used for trunk-only regression issues?

> @Andarwinux why did you tag this with regression24? we are still in the 24.x cycle and the tag is supposed to reflect regressions after branch

_Originally posted by @RKSimon in [#215069](https://github.com/llvm/llvm-project/issues/215069#issuecomment-5341547352)_

As a triager, which label should I add to trunk-only regression issues? Should it be `regression:24`, or `regression`, or just nothing? Could someone clarify what's the correct approach?

cc @EugeneZelenko

Start with the quoted discussion from issue #215069 and compare the three possibilities named here: regression:24, regression, or no label. The issue is done when maintainers confirm the correct label policy for trunk-only regression issues.

Written by the indexing model from the issue text.