Export value of sample_limit

[svend]

Proposal

This is a feature request.

Export value of sample_limit so that alerts can be set for scrapes that are approaching the limit without hard-coding the limit in the alert.

I checked the exported metrics on Prometheus 2.3.2 and didn't see this currently exported.

[brian-brazil]

This would be a new additional sample for every single target, which is not something to add lightly from a resource usage standpoint. It's expected that you'd know the values you're using, and not have many of them, so this could be handled fairly sanely via configuration management.

[svend]

That's a good point. I had forgotten that the limit was set per scape config, not globally.