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    Is there a way to basically do what prometheus.ex does normally (including custom instrumentation for the app) but make it go through Telemetry?

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      Everyone who has ever promoted Erlang to me insisted that such things aren’t required and that Erlang magically recovers any crashes and so none of this matter. Were they wrong?

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        “Let it crash” is about keeping unexpected errors from corrupting the state of the system. You let that one little process crash and restart in a good state. It doesn’t mean your code shouldn’t handle expected situations. Monitoring helps you expand your expectations based on experience.