prometheus active alerts - block reboot if regexp matches

[jimliming]

Currently --alert-filter-regexp will filter out items from a list of active alerts in Prometheus. If anything is left, a reboot will be blocked.

I'm hoping to match on very specific alerts and block reboots on those. so, we take the entire list and if "(A|B|C|D)" exists, then block reboots.

I spent some time trying to write something to inverse this, but without the ability to use lookahead/lookbehind (this isnt supported in https://github.com/google/re2/wiki/Syntax) I couldnt get anything to work out.

Let me know if this is interesting/on a list somewhere. I could take a stab at a PR if there's interest.

edit: Could even be as simple as we add a parameter to control if alert-filter-regexp is an inverse match or not. (default being current behavior of inverse)

[ckotzbauer]

Hi @jimliming,
thanks for opening this issue. Yeah, I think it would make sense to add a parameter which would invert the logic the regex-result is processed. Would you mind opening a PR?

[jimliming]

You bet, opened in: #786