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kotlinlang

But how to use them? I can't find some demo code. Somebody give a hint ? Thanks.

<https://ktor.io/features/call-logging.html>

Sorry. Misread it. As Johannes suggested, there is a sample in the CallLogging implementation for using events. How to use them are there.

Basically there is a `monitor` instance that you can grab from: `application.environment.monitor`

And then you do things like:

`monitor.subscribe` and `monitor.unsubscribe` with the event definitions and handlers.

I have added a new page explaining this: <https://ktor.io/advanced/events.html>