Fix: custom attrs Flask to request_counter, not span

Author: tammy-baylis-swi

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

@@ -380,6 +380,10 @@ def _wrapped_app(wrapped_app_environ, start_response):
                 sem_conv_opt_in_mode,
             )
         )
+        # Enhance attributes with any custom labeler attributes
+        active_requests_count_attrs = enhance_metric_attributes(
+            active_requests_count_attrs
+        )
 
         active_requests_counter.add(1, active_requests_count_attrs)
         request_route = None
@@ -485,8 +489,6 @@ def _before_request():
             flask_request_environ,
             sem_conv_opt_in_mode=sem_conv_opt_in_mode,
         )
-        # Enhance attributes with custom labeler attributes
-        attributes = enhance_metric_attributes(attributes)
         if flask.request.url_rule:
             # For 404 that result from no route found, etc, we
             # don't have a url_rule.