problemMatcher - documentation

In some action we can found, that they write to logs:

##[add-matcher]<path_to_json>

I’m looking for documentation for this feature.

I found only https://help.github.com/en/articles/development-tools-for-github-actions

but on this page is missing of this.
Can you point me some place?

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Thank you for your feedback. We have passed this along to the product team for future consideration.

Hey @slawekjaranowski,

Unfortunately no official documentation, but I’ve been exploring problem matchers today and put down my findings in a blog post. Hope it can be of use!

Cheers,

 Jonas

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Does this count? https://github.com/actions/toolkit/blob/master/docs/commands.md#problem-matchers

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Thanks! I thought that the documentation at https://help.github.com/en/actions/automating-your-workflow-with-github-actions/building-actions wasthe go to documentation, but the toolkit seems much more complete.

I wonder why docs.github.com has no section about problem matchers (as of Dec. 2020), but I’ve found the following one is the only doc that describes the syntax of problem matchers: