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Prometheus (pull-based) or Graphite (push-based)? They both IIRC come with their own built-in explorer and graph renderer, that's not as pretty as grafana but definitely good enough.
This. Grafana is just a frontend, but Prometheus itself is a single Go binary and has a usable web UI with graphing.
FWIW all you need to put stuff into Prometheus is serve a trivial text format on an HTTP endpoint.
(ignore the client libraries, they're all overkill, just roll your own in like 10 lines of code)
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