Integration (observe-lwt-unix.Observe_lwt_unix.Lifecycle.Integration)

type facts =

| No_problem
| Rejected
| Delivery_lost
| Rejected_and_lost

type error =

| Closed
| Invalid_label

val register : 
  label:string ->
  facts:(unit -> facts) ->
  flush:(unit -> unit Lwt.t) ->
  shutdown:(unit -> unit Lwt.t) ->
  (unit, error) Stdlib.result

Register a ready output with a bounded safe label and finite cumulative delivery facts. Fact callbacks are sampled synchronously when lifecycle reports are produced, including timeout snapshots, and must be prompt, side-effect free, and concurrency-safe. Independent flush boundaries may overlap each other and an in-progress shutdown; repeated shutdown callers share one shutdown invocation. Runtime control exceptions remain native.