Why is that ironic? Since Mimir is open-source, $0 revenue users are expected. AFAIK, Grafana Labs relies heavily on go, typescript, and linux, without necessarily being their top financial contributor. They could have kept Mimir proprietary like Splunk, but whether that would have attracted the same level of adoption or community contribution is another matter.
I have used Prometheus a lot. Reliable is not a word I would associate with it.
That's a very professional way of saying "Wait, everyone just lives with this? What the fuck?!"
Many such cases in the Prometheus ecosystem.