Grafana

Grafana is a tool I first started using profesionally about a decade ago but have since spent most of my time using paid SaaS alternatives. Almost certainly the single biggest challenge with a stack involving Grafana is that a decent experience may require a fair amount of knowledge and attention for optimized data acess. Grafana itself has some UX quirks, tends to be a bit too tied to implementations for my taste, and has not historically lent itself to declarative configuration which could be more conducive for infrastructure-as-code or abstraction. There are efforts to provide more revoluationary changes which I'll likely start tracking.

Grafana seems to remain the dominant open-source metric visualization tool, however, and given that I periodically need to work with it I'll be starting to dig into it and also look to introduce some of its stack for some of my personal toy projects.