Although I'm seeing this in Pacific, it appears to be a perennial issue with no well-documented solution. The dashboard home screen is flooded with popups saying "404 - Not Found Could not reach Prometheus's API on http://ceph1234.mydomain.com:9095/api/v1 " If I was a slack-jawed PHB casually wandering into the operations center and saw that, I'd probably doubt that Ceph was a good product decision. The "404" indicates that the Prometheus server is running and accepting requests, but all the "404" says is that whatever requests it's receiving are meaningless to it. Presumably either some handler needs to be jacked into Prometheus or the sender needs to be notified to desist. Unfortunately, "404" doesn't provide any clues. Ideally, ceph should log something more specific by default, but failing that, if anyone knows how to shut it up (cleanly), I'd appreciate knowing! Tim