diff --git a/src/client-cohttp-eio/config.ml b/src/client-cohttp-eio/config.ml
index 930881ff..4f3677de 100644
--- a/src/client-cohttp-eio/config.ml
+++ b/src/client-cohttp-eio/config.ml
@@ -1,7 +1,7 @@
-type t = Opentelemetry_client.Config.t
+type t = Opentelemetry_client.Client_config.t
 
-module Env = Opentelemetry_client.Config.Env ()
+module Env = Opentelemetry_client.Client_config.Env ()
 
-let pp = Opentelemetry_client.Config.pp
+let pp = Opentelemetry_client.Client_config.pp
 
 let make = Env.make (fun common () -> common)
diff --git a/src/client-cohttp-eio/config.mli b/src/client-cohttp-eio/config.mli
index 100bb696..dff28732 100644
--- a/src/client-cohttp-eio/config.mli
+++ b/src/client-cohttp-eio/config.mli
@@ -1,4 +1,4 @@
-type t = Opentelemetry_client.Config.t
+type t = Opentelemetry_client.Client_config.t
 (** Configuration.
 
     To build one, use {!make} below. This might be extended with more fields in
@@ -6,7 +6,7 @@ type t = Opentelemetry_client.Config.t
 
 val pp : Format.formatter -> t -> unit
 
-val make : (unit -> t) Opentelemetry_client.Config.make
+val make : (unit -> t) Opentelemetry_client.Client_config.make
 (** Make a configuration {!t}. *)
 
-module Env : Opentelemetry_client.Config.ENV
+module Env : Opentelemetry_client.Client_config.ENV
diff --git a/src/client-cohttp-eio/opentelemetry_client_cohttp_eio.ml b/src/client-cohttp-eio/opentelemetry_client_cohttp_eio.ml
index 67b7b169..6a182963 100644
--- a/src/client-cohttp-eio/opentelemetry_client_cohttp_eio.ml
+++ b/src/client-cohttp-eio/opentelemetry_client_cohttp_eio.ml
@@ -25,48 +25,6 @@ let last_gc_metrics = Atomic.make (Mtime_clock.now ())
 
 let timeout_gc_metrics = Mtime.Span.(20 * s)
 
-(* Cross-domain, thread-safe storage for GC metrics gathered from different fibres. *)
-module GC_metrics : sig
-  val add : Proto.Metrics.resource_metrics -> unit
-
-  val drain : unit -> Proto.Metrics.resource_metrics list
-end = struct
-  (* Used to prevent data races across domains *)
-  let mutex = Eio.Mutex.create ()
-
-  let gc_metrics = ref []
-
-  let add m =
-    Eio.Mutex.use_rw ~protect:true mutex (fun () ->
-        gc_metrics := m :: !gc_metrics)
-
-  let drain () =
-    Eio.Mutex.use_rw ~protect:true mutex (fun () ->
-        let metrics = !gc_metrics in
-        gc_metrics := [];
-        metrics)
-end
-
-(* capture current GC metrics if {!needs_gc_metrics} is true,
-   or it has been a long time since the last GC metrics collection,
-   and push them into {!gc_metrics} for later collection *)
-let sample_gc_metrics_if_needed () =
-  let now = Mtime_clock.now () in
-  let alarm = Atomic.compare_and_set needs_gc_metrics true false in
-  let timeout () =
-    let elapsed = Mtime.span now (Atomic.get last_gc_metrics) in
-    Mtime.Span.compare elapsed timeout_gc_metrics > 0
-  in
-  if alarm || timeout () then (
-    Atomic.set last_gc_metrics now;
-    let l =
-      OT.Metrics.make_resource_metrics
-        ~attrs:(Opentelemetry.GC_metrics.get_runtime_attributes ())
-      @@ Opentelemetry.GC_metrics.get_metrics ()
-    in
-    GC_metrics.add l
-  )
-
 type error =
   [ `Status of int * Opentelemetry.Proto.Status.status
   | `Failure of string
@@ -282,7 +240,6 @@ let mk_emitter ~stop ~net (config : Config.t) : (module EMITTER) =
 
     let push_metrics x =
       let@ () = guard_exn_ "push metrics" in
-      sample_gc_metrics_if_needed ();
       push_to_batch batch_metrics x
 
     let push_logs x =
@@ -299,8 +256,7 @@ let mk_emitter ~stop ~net (config : Config.t) : (module EMITTER) =
 
     let emit_metrics_maybe =
       maybe_emit batch_metrics config.url_metrics (fun collected_metrics ->
-          let gc_metrics = GC_metrics.drain () in
-          gc_metrics @ collected_metrics |> Signal.Encode.metrics)
+          collected_metrics |> Signal.Encode.metrics)
 
     let emit_logs_maybe =
       maybe_emit batch_logs config.url_logs Signal.Encode.logs
@@ -336,7 +292,6 @@ let mk_emitter ~stop ~net (config : Config.t) : (module EMITTER) =
       if Config.Env.get_debug () then
         Printf.eprintf "tick (from domain %d)\n%!" (Domain.self () :> int);
       run_tick_callbacks ();
-      sample_gc_metrics_if_needed ();
       emit_all ~force:false
 
     let cleanup ~on_done () =
@@ -344,13 +299,12 @@ let mk_emitter ~stop ~net (config : Config.t) : (module EMITTER) =
         Printf.eprintf "opentelemetry: exiting…\n%!";
       Atomic.set stop true;
       run_tick_callbacks ();
-      sample_gc_metrics_if_needed ();
       emit_all ~force:true;
       on_done ()
   end in
   (module M : EMITTER)
 
-module Backend (Emitter : EMITTER) : Opentelemetry.Collector.BACKEND = struct
+module Backend (Emitter : EMITTER) : Opentelemetry.Exporter.t = struct
   open Opentelemetry.Proto
   open Opentelemetry.Collector
   open Emitter
diff --git a/src/integrations/logs/opentelemetry_logs.ml b/src/integrations/logs/opentelemetry_logs.ml
index 51aa0818..a91f2e44 100644
--- a/src/integrations/logs/opentelemetry_logs.ml
+++ b/src/integrations/logs/opentelemetry_logs.ml
@@ -34,15 +34,11 @@ let emit_telemetry do_emit = Logs.Tag.(empty |> add emit_telemetry_tag do_emit)
 (*****************************************************************************)
 
 (* Log a message to otel with some attrs *)
-let log ?service_name ?(attrs = []) ?(scope = Otel.Scope.get_ambient_scope ())
-    ~level msg =
+let log ?service_name ?(attrs = []) ?(scope = Otel.Ambient_span.get ()) ~level
+    msg =
   let log_level = Logs.level_to_string (Some level) in
-  let span_id =
-    Option.map (fun (scope : Otel.Scope.t) -> scope.span_id) scope
-  in
-  let trace_id =
-    Option.map (fun (scope : Otel.Scope.t) -> scope.trace_id) scope
-  in
+  let span_id = Option.map Otel.Span.id scope in
+  let trace_id = Option.map Otel.Span.trace_id scope in
   let severity = log_level_to_severity level in
   let log =
     Otel.Log_record.make_str ~severity ~log_level ?trace_id ?span_id msg