Pull out labels from prometheus metric

[anon70503803]

Hello,

regex-based value mapping will ship with Grafana 8.2 TOMORROW!

See this post for more details on how to test it in 8.2-beta and how it works:

How to Rename Values in Grafana Using Regex-Based Value Mapping

@fadjar340 Here are the new Grafana docs for regex-based value-mapping. And here is an example, using your data. I copied your string value, but not exactly [CleanShot 2021-09-28 at 13.01.37@2x] Chose the new Regex option: [CleanShot 2021-09-28 at 13.02.26@2x] Here is my rather ugly regex with a capture group for the user IDs: [CleanShot 2021-09-28 at 13.02.35@2x] And there you go! [CleanShot 2021-09-28 at 13.02.47@2x] When I first saw this PR get merged, I was so exci…