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I use netdata, it’s very good at digesting thousands of metrics to sharing actionable. The cloud portion is proprietary, but you can toggle off the data collection. I did turn on the cloud portion though, I get email notifications when something breaks. Might sound counter to the self hosted mantra, but a self hosted monitoring system isn’t very helpful when your own systems go down.
A major caveat I’ve noticed some people misunderstand: it’s corporate CLAs that are problematic. The Apache Foundation also requires contributors sign a CLA, but it’s to provide a legal fail safe and a way to update to say Apache 3.0 if need be one day. Apache’s non profit, open source mission aligns with respecting the rights of contributors and the community. Corporations, on the other hand, not so much.