Module Trace_subscriber.Subscriber

type t =
  1. | Sub : {
    1. st : 'st;
    2. callbacks : 'st Callbacks.t;
    } -> t

A trace subscriber. It pairs a set of callbacks with the state they need (which can contain a file handle, a socket, config, etc.).

The design goal for this is that it should be possible to avoid allocations when the trace collector calls the callbacks.

val dummy : t

Dummy subscriber that ignores every call.

val tee : t -> t -> t

tee s1 s2 is a subscriber that forwards every call to s1 and s2 both.