feat: add runtime/otel-specific name and version modifiable

this way we can mock them in tests, but we can also change the name
"ocaml-otel" to something else, e.g. if we have specific conventions.

src/client/util_resources.ml

@@ -7,7 +7,8 @@ let make_resource_logs ?service_name ?attrs (logs : Proto.Logs.log_record list)
   let attributes = OTEL.Globals.mk_attributes ?service_name ?attrs () in
   let resource = Proto.Resource.make_resource ~attributes () in
   let ll =
-    Proto.Logs.make_scope_logs ~scope:OTEL.Globals.instrumentation_library
+    Proto.Logs.make_scope_logs
+      ~scope:(OTEL.Globals.instrumentation_library ())
       ~log_records:logs ()
   in
   Proto.Logs.make_resource_logs ~resource ~scope_logs:[ ll ] ()
@@ -15,7 +16,8 @@ let make_resource_logs ?service_name ?attrs (logs : Proto.Logs.log_record list)
 let make_resource_spans ?service_name ?attrs spans : Proto.Trace.resource_spans
     =
   let ils =
-    Proto.Trace.make_scope_spans ~scope:OTEL.Globals.instrumentation_library
+    Proto.Trace.make_scope_spans
+      ~scope:(OTEL.Globals.instrumentation_library ())
       ~spans ()
   in
   let attributes = OTEL.Globals.mk_attributes ?service_name ?attrs () in
@@ -27,7 +29,9 @@ let make_resource_metrics ?service_name ?attrs (l : OTEL.Metrics.t list) :
     Proto.Metrics.resource_metrics =
   let open Proto.Metrics in
   let lm =
-    make_scope_metrics ~scope:OTEL.Globals.instrumentation_library ~metrics:l ()
+    make_scope_metrics
+      ~scope:(OTEL.Globals.instrumentation_library ())
+      ~metrics:l ()
   in
   let attributes = OTEL.Globals.mk_attributes ?service_name ?attrs () in
   let resource = Proto.Resource.make_resource ~attributes () in

src/lib/globals.ml

@@ -16,8 +16,14 @@ let service_instance_id = ref None
     @since 0.12 *)
 let service_version = ref None
 
-let instrumentation_library =
-  make_instrumentation_scope ~version:"%%VERSION_NUM%%" ~name:"ocaml-otel" ()
+let instrumentation_name = ref "ocaml-otel"
+
+let instrumentation_runtime_version = ref "%%VERSION_NUM%%"
+
+let instrumentation_library () =
+  make_instrumentation_scope
+    ~version:!instrumentation_runtime_version
+    ~name:!instrumentation_name ()
 
 (** Global attributes, initially set via OTEL_RESOURCE_ATTRIBUTES and modifiable
     by the user code. They will be attached to each outgoing metrics/traces. *)

tests/bin/emit_logs_cohttp.ml

@@ -69,6 +69,7 @@ let () =
   Sys.catch_break true;
   T.Globals.service_name := "t1";
   T.Globals.service_namespace := Some "ocaml-otel.test";
+  T.Globals.instrumentation_runtime_version := "<fixed>";
 
   let debug = ref false in
   let batch_traces = ref 400 in

tests/client_e2e/clients_e2e_lib.ml

@@ -213,6 +213,7 @@ let tests params signal_batches =
   ]
 
 let run_tests ~port (cmds : _ list) : unit =
+  Opentelemetry.Globals.instrumentation_runtime_version := "<fixed>";
   let suites =
     let open Lwt.Syntax in
     Lwt_main.run

tests/logs/test_logs_e2e.expected

@@ -19,7 +19,7 @@
     [{ scope =
          Some(
            { name = "ocaml-otel";
-             version = "%%VERSION_NUM%%";
+             version = "<fixed>";
              attributes = [];
              dropped_attributes_count = 0 (* absent *);
            });