[Tracker Issue] Itemize Requirements and Implementation for Prometheus Receiver Tests

[alolita]

Document Prometheus receiver tests needed to verify it is functioning as expected. This doc will also itemize expected behavior.

[alolita]

@vishiy were you going to add some documentation on itemizing the Prometheus receiver tests. A doc or test cases would great to have.

[alolita]

@RichiH do you have any tests for configuration and receiver tests expected for Prometheus? Can you please share some docs or links to existing tests?

[RichiH]

We don't, but I would love to get alignment and if you write tests those could be upstreamed to Prometheus.

[alolita]

Design doc started today in the Prometheus WG by RichiH for community collaboration and discussion is now available at:
https://docs.google.com/document/d/1DGdpWKEE666n8bGVBu_7upKJEDbHiaNFPuzMB6bx-cY/edit

[vishiy]

@RichiH - We started a preliminary list of prometheus receiver compatibility cases, in the above doc. We would want to ensure prom config compatibility & also data compatibility between prom receiver & prom, i believe ? Can you please help by taking a look (thank you!).
Also fyi @jmacd , to get his feedbacks from special cases handled by him in his side car as we discussed in last SIG.
@alolita @dashpole , please take a look as well.