fixup! CP-48195: Set Tracing.observe default to false

Signed-off-by: Gabriel Buica <danutgabriel.buica@cloud.com>

Author: GabrielBuica

ocaml/libs/tracing/tracing.ml

@@ -88,8 +88,6 @@ let observe = Atomic.make false
 
 let set_observe = Atomic.set observe
 
-let get_observe () = Atomic.get observe
-
 module SpanKind = struct
   type t = Server | Consumer | Client | Producer | Internal [@@deriving rpcty]
 
@@ -563,20 +561,18 @@ let set ?enabled ?attributes ?endpoints ~uuid () =
             failwith
               (Printf.sprintf "The TracerProvider : %s does not exist" uuid)
       in
-      Hashtbl.replace tracer_providers uuid provider
-  ) ;
-  if
-    List.for_all
-      (fun provider -> not provider.TracerProvider.enabled)
-      (get_tracer_providers ())
-  then (
-    set_observe false ;
-    Xapi_stdext_threads.Threadext.Mutex.execute Spans.lock (fun () ->
+      Hashtbl.replace tracer_providers uuid provider ;
+      if
+        List.for_all
+          (fun provider -> not provider.TracerProvider.enabled)
+          (get_tracer_providers ())
+      then (
+        set_observe false ;
         Hashtbl.clear Spans.spans ;
         Hashtbl.clear Spans.finished_spans
-    )
-  ) else if not (get_observe ()) then
-    set_observe true
+      ) else
+        set_observe true
+  )
 
 let create ~enabled ~attributes ~endpoints ~name_label ~uuid =
   let endpoints = List.map endpoint_of_string endpoints in
@@ -618,7 +614,7 @@ let enable_span_garbage_collector ?(timeout = 86400.) () =
   Spans.GC.initialise_thread ~timeout
 
 let with_tracing ?(attributes = []) ?(parent = None) ~name f =
-  if not (get_observe ()) then
+  if not (Atomic.get observe) then
     f None
   else
     let tracer = get_tracer ~name in

ocaml/libs/tracing/tracing.mli

@@ -176,8 +176,6 @@ val with_tracing :
 
 val set_observe : bool -> unit
 
-val get_observe : unit -> bool
-
 val validate_attribute : string * string -> bool
 
 (** [EnvHelpers] module is a helper module for the tracing library to easily 

ocaml/xapi/xapi_observer.ml

@@ -309,7 +309,7 @@ module Dom0ObserverConfig (ObserverComponent : OBSERVER_COMPONENT) :
 
   let update_config ~__context ~observer ~uuid =
     if Db.Observer.get_enabled ~__context ~self:observer then (
-      if not (Tracing.get_observe ()) then Tracing.set_observe true ;
+      Tracing.set_observe true ;
       let observer_config =
         ObserverConfig.config_of_observer ~__context
           ~component:ObserverComponent.component ~observer