S (trace.Trace_subscriber.Callbacks.S)

type st

Type of the state passed to every callback.

val on_init : st -> time_ns:float -> unit

Called when the subscriber is initialized in a collector

val on_shutdown : st -> time_ns:float -> unit

Called when the collector is shutdown

val on_name_thread : st -> time_ns:float -> tid:int -> name:string -> unit

Current thread is being named

val on_name_process : st -> time_ns:float -> tid:int -> name:string -> unit

Current process is being named

val on_enter_span : 
  st ->
  __FUNCTION__:string option ->
  __FILE__:string ->
  __LINE__:int ->
  time_ns:float ->
  tid:int ->
  data:(string * Trace_subscriber__.Types.user_data) list ->
  name:string ->
  Trace_core.span ->
  unit

Enter a regular (sync) span

val on_exit_span : st -> time_ns:float -> tid:int -> Trace_core.span -> unit

Exit a span. This and on_enter_span must follow strict stack discipline

val on_add_data : 
  st ->
  data:(string * Trace_subscriber__.Types.user_data) list ->
  Trace_core.span ->
  unit

Add data to a regular span (which must be active)

val on_message : 
  st ->
  time_ns:float ->
  tid:int ->
  span:Trace_core.span option ->
  data:(string * Trace_subscriber__.Types.user_data) list ->
  string ->
  unit

Emit a log message

val on_counter : 
  st ->
  time_ns:float ->
  tid:int ->
  data:(string * Trace_subscriber__.Types.user_data) list ->
  name:string ->
  float ->
  unit

Emit the current value of a counter

val on_enter_manual_span : 
  st ->
  __FUNCTION__:string option ->
  __FILE__:string ->
  __LINE__:int ->
  time_ns:float ->
  tid:int ->
  parent:Trace_core.span option ->
  data:(string * Trace_subscriber__.Types.user_data) list ->
  name:string ->
  flavor:Trace_subscriber__.Types.flavor option ->
  trace_id:int ->
  Trace_core.span ->
  unit

Enter a manual (possibly async) span

val on_exit_manual_span : 
  st ->
  time_ns:float ->
  tid:int ->
  name:string ->
  data:(string * Trace_subscriber__.Types.user_data) list ->
  flavor:Trace_subscriber__.Types.flavor option ->
  trace_id:int ->
  Trace_core.span ->
  unit

Exit a manual span

val on_extension_event : 
  st ->
  time_ns:float ->
  tid:int ->
  Trace_core.extension_event ->
  unit

Extension event

since NEXT_RELEASE