fix: Fix missing metric response attributes in HTTPX instrumentation

CHANGELOG.md

@@ -19,6 +19,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Fixed
 
+- `opentelemetry-instrumentation-httpx`: fix missing metric response attributes when tracing is disabled
+  ([#3615](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/3615))
 - `opentelemetry-instrumentation-asgi`: fix excluded_urls in instrumentation-asgi
   ([#3567](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/3567))
 - `opentelemetry-resource-detector-containerid`: make it more quiet on platforms without cgroups

instrumentation/opentelemetry-instrumentation-httpx/src/opentelemetry/instrumentation/httpx/__init__.py

@@ -417,7 +417,6 @@ def _apply_request_client_attributes_to_span(
 
 def _apply_response_client_attributes_to_span(
     span: Span,
-    metric_attributes: dict[str, typing.Any],
     status_code: int,
     http_version: str,
     semconv: _StabilityMode,
@@ -433,6 +432,30 @@ def _apply_response_client_attributes_to_span(
     http_status_code = http_status_to_status_code(status_code)
     span.set_status(http_status_code)
 
+    if http_status_code == StatusCode.ERROR and _report_new(semconv):
+        # http semconv transition: new error.type
+        span_attributes[ERROR_TYPE] = str(status_code)
+
+    if http_version and _report_new(semconv):
+        # http semconv transition: http.flavor -> network.protocol.version
+        _set_http_network_protocol_version(
+            span_attributes,
+            http_version.replace("HTTP/", ""),
+            semconv,
+        )
+
+    for key, val in span_attributes.items():
+        span.set_attribute(key, val)
+
+
+def _apply_response_client_attributes_to_metrics(
+    span: Span | None,
+    metric_attributes: dict[str, typing.Any],
+    status_code: int,
+    http_version: str,
+    semconv: _StabilityMode,
+) -> None:
+    """Apply response attributes to metric attributes."""
     # Set HTTP status code in metric attributes
     _set_status(
         span,
@@ -443,26 +466,12 @@ def _apply_response_client_attributes_to_span(
         sem_conv_opt_in_mode=semconv,
     )
 
-    if http_status_code == StatusCode.ERROR and _report_new(semconv):
-        # http semconv transition: new error.type
-        span_attributes[ERROR_TYPE] = str(status_code)
-
     if http_version and _report_new(semconv):
-        # http semconv transition: http.flavor -> network.protocol.version
         _set_http_network_protocol_version(
             metric_attributes,
             http_version.replace("HTTP/", ""),
             semconv,
         )
-        if _report_new(semconv):
-            _set_http_network_protocol_version(
-                span_attributes,
-                http_version.replace("HTTP/", ""),
-                semconv,
-            )
-
-    for key, val in span_attributes.items():
-        span.set_attribute(key, val)
 
 
 class SyncOpenTelemetryTransport(httpx.BaseTransport):
@@ -592,11 +601,19 @@ def handle_request(
                     _extract_response(response)
                 )
 
+                # Always apply response attributes to metrics
+                _apply_response_client_attributes_to_metrics(
+                    span,
+                    metric_attributes,
+                    status_code,
+                    http_version,
+                    self._sem_conv_opt_in_mode,
+                )
+
                 if span.is_recording():
                     # apply http client response attributes according to semconv
                     _apply_response_client_attributes_to_span(
                         span,
-                        metric_attributes,
                         status_code,
                         http_version,
                         self._sem_conv_opt_in_mode,
@@ -777,11 +794,19 @@ async def handle_async_request(
                     _extract_response(response)
                 )
 
+                # Always apply response attributes to metrics
+                _apply_response_client_attributes_to_metrics(
+                    span,
+                    metric_attributes,
+                    status_code,
+                    http_version,
+                    self._sem_conv_opt_in_mode,
+                )
+
                 if span.is_recording():
                     # apply http client response attributes according to semconv
                     _apply_response_client_attributes_to_span(
                         span,
-                        metric_attributes,
                         status_code,
                         http_version,
                         self._sem_conv_opt_in_mode,
@@ -1001,11 +1026,19 @@ def _handle_request_wrapper(  # pylint: disable=too-many-locals
                     _extract_response(response)
                 )
 
+                # Always apply response attributes to metrics
+                _apply_response_client_attributes_to_metrics(
+                    span,
+                    metric_attributes,
+                    status_code,
+                    http_version,
+                    sem_conv_opt_in_mode,
+                )
+
                 if span.is_recording():
                     # apply http client response attributes according to semconv
                     _apply_response_client_attributes_to_span(
                         span,
-                        metric_attributes,
                         status_code,
                         http_version,
                         sem_conv_opt_in_mode,
@@ -1109,11 +1142,19 @@ async def _handle_async_request_wrapper(  # pylint: disable=too-many-locals
                     _extract_response(response)
                 )
 
+                # Always apply response attributes to metrics
+                _apply_response_client_attributes_to_metrics(
+                    span,
+                    metric_attributes,
+                    status_code,
+                    http_version,
+                    sem_conv_opt_in_mode,
+                )
+
                 if span.is_recording():
                     # apply http client response attributes according to semconv
                     _apply_response_client_attributes_to_span(
                         span,
-                        metric_attributes,
                         status_code,
                         http_version,
                         sem_conv_opt_in_mode,