fix(telemetry): add common gen_ai attributes to event loop cycle spans (#1973)

Co-authored-by: giulio-leone <giulio.leone@users.noreply.github.com>

Author: giulio-leone

src/strands/telemetry/tracer.py

@@ -526,9 +526,10 @@ def start_event_loop_cycle_span(
         event_loop_cycle_id = str(invocation_state.get("event_loop_cycle_id"))
         parent_span = parent_span if parent_span else invocation_state.get("event_loop_parent_span")
 
-        attributes: dict[str, AttributeValue] = {
-            "event_loop.cycle_id": event_loop_cycle_id,
-        }
+        attributes: dict[str, AttributeValue] = self._get_common_attributes(
+            operation_name="execute_event_loop_cycle"
+        )
+        attributes["event_loop.cycle_id"] = event_loop_cycle_id
 
         if custom_trace_attributes:
             attributes.update(custom_trace_attributes)

tests/strands/telemetry/test_tracer.py

@@ -743,6 +743,8 @@ def test_start_event_loop_cycle_span(mock_tracer):
 
         mock_span.set_attributes.assert_called_once_with(
             {
+                "gen_ai.operation.name": "execute_event_loop_cycle",
+                "gen_ai.system": "strands-agents",
                 "event_loop.cycle_id": "cycle-123",
                 "request_id": "req-456",
                 "trace_level": "debug",
@@ -772,7 +774,13 @@ def test_start_event_loop_cycle_span_latest_conventions(mock_tracer, monkeypatch
         mock_tracer.start_span.assert_called_once()
         assert mock_tracer.start_span.call_args[1]["name"] == "execute_event_loop_cycle"
 
-        mock_span.set_attributes.assert_called_once_with({"event_loop.cycle_id": "cycle-123"})
+        mock_span.set_attributes.assert_called_once_with(
+            {
+                "gen_ai.operation.name": "execute_event_loop_cycle",
+                "gen_ai.provider.name": "strands-agents",
+                "event_loop.cycle_id": "cycle-123",
+            }
+        )
         mock_span.add_event.assert_any_call(
             "gen_ai.client.inference.operation.details",
             attributes={