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Telemetry is a lightweight library for dynamic dispatching of events, with afocus on metrics and instrumentation. Any OCaml library can use telemetry toemit events, then application code and other libraries can then hook into thoseevents and run custom handlers.

Install from Opam:

opam install telemetry

Create some events in your library or application code:

typeTelemetry.event +=Web_request_doneof {latency:int }Telemetry.emit (Web_request_done { latency=10 });

And now attach listeners:

Telemetry.attach (funev ->match evwith|Web_request_done{latency} ->Printf.printf"Web request took %sms" latency|_ ->());