missedmessage_emails: Add Sentry spans to worker thread.

zerver/worker/queue_processors.py

@@ -620,6 +620,7 @@ class MissedMessageWorker(QueueProcessingWorker):
     # The main thread, which handles the RabbitMQ connection and creates
     # database rows from them.
     @override
+    @sentry_sdk.trace
     def consume(self, event: Dict[str, Any]) -> None:
         logging.debug("Processing missedmessage_emails event: %s", event)
         # When we consume an event, check if there are existing pending emails
@@ -693,6 +694,11 @@ class MissedMessageWorker(QueueProcessingWorker):
 
     def work(self) -> None:
         while True:
+            with sentry_sdk.start_transaction(
+                op="task",
+                name=f"{self.queue_name} worker thread",
+                custom_sampling_context={"queue": self.queue_name},
+            ):
                 flush_per_request_caches()
                 reset_queries()
                 try:
@@ -747,7 +753,10 @@ class MissedMessageWorker(QueueProcessingWorker):
                 # re-checking the condition.
                 return False
 
+            with sentry_sdk.start_span(description="condvar wait") as span:
+                span.set_data("timeout", timeout)
                 was_notified = self.cv.wait_for(wait_condition, timeout=timeout)
+                span.set_data("was_notified", was_notified)
 
         # Being notified means that we are in conditions (1) or
         # (2), above.  In neither case do we need to look at if
@@ -759,6 +768,7 @@ class MissedMessageWorker(QueueProcessingWorker):
 
         return False
 
+    @sentry_sdk.trace
     def maybe_send_batched_emails(self) -> None:
         current_time = timezone_now()
 
@@ -782,6 +792,11 @@ class MissedMessageWorker(QueueProcessingWorker):
                     len(events),
                     user_profile_id,
                 )
+                with sentry_sdk.start_span(
+                    description="sending missedmessage_emails to user"
+                ) as span:
+                    span.set_data("user_profile_id", user_profile_id)
+                    span.set_data("event_count", len(events))
                     try:
                         # Because we process events in batches, an
                         # escaped exception here would lead to