feat: Send Celery retry count

Send the retry count of a Celery task as a span data attribute on the "queue.process" span. Also, add tests for this feature.

Ref #2961

sentry_sdk/consts.py

@@ -270,6 +270,11 @@ class SPANDATA:
     e.g. the queue name or topic.
     """
 
+    MESSAGING_MESSAGE_RETRY_COUNT = "messaging.message.retry.count"
+    """
+    Number of retries/attempts to process a message.
+    """
+
     SERVER_ADDRESS = "server.address"
     """
     Name of the database host.

sentry_sdk/integrations/celery/__init__.py

@@ -356,6 +356,11 @@ def _inner(*args, **kwargs):
                 op=OP.QUEUE_PROCESS, description=task.name
             ) as span:
                 _set_messaging_destination_name(task, span)
+                with capture_internal_exceptions():
+                    span.set_data(
+                        SPANDATA.MESSAGING_MESSAGE_RETRY_COUNT, task.request.retries
+                    )
+
                 return f(*args, **kwargs)
         except Exception:
             exc_info = sys.exc_info()

tests/integrations/celery/test_celery.py

@@ -659,3 +659,34 @@ def task(): ...
     (event,) = events
     (span,) = event["spans"]
     assert "messaging.destination.name" not in span["data"]
+
+
+def test_retry_count_zero(init_celery, capture_events):
+    celery = init_celery(enable_tracing=True)
+    events = capture_events()
+
+    @celery.task()
+    def task(): ...
+
+    task.apply_async()
+
+    (event,) = events
+    (span,) = event["spans"]
+    assert span["data"]["messaging.message.retry.count"] == 0
+
+
+@mock.patch("celery.app.task.Task.request")
+def test_retry_count_nonzero(mock_request, init_celery, capture_events):
+    mock_request.retries = 3
+
+    celery = init_celery(enable_tracing=True)
+    events = capture_events()
+
+    @celery.task()
+    def task(): ...
+
+    task.apply_async()
+
+    (event,) = events
+    (span,) = event["spans"]
+    assert span["data"]["messaging.message.retry.count"] == 3