Certain Prometheus metrics are missing, like scrape_duration_seconds. A lot of these help with diagnosing metrics issues. Recently I discovered that one of my apps was taking 20-30s to scrape and was throwing out rate calculations.
I imagine these aren’t currently exposed due to single instances of some internal services being used to scrape apps from different organizations but I’m only guessing.
I thought I saw that some of the built-in Prometheus metrics were exposed in a doc page but I can’t now find it.