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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)
that's actually a problem for me because the sensor node is some piece of junk like an esp8266 and it's behind a NAT i don't control
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