Add fan out delivery time to track message arrival

src/main.py

@@ -46,6 +46,7 @@ def add_detectors(
         self,
         message: dict,
         active_detectors: list,
+        fan_out_delivery_time: str
     ) -> list[dict[str, str]]:
         """Adds and duplicates next visit messages for fanout.
 
@@ -55,6 +56,8 @@ def add_detectors(
             The next visit message.
         active_detectors: `list`
             The active detectors for an instrument.
+        fan_out_delivery_Time: `str`
+            The time that fan out sends the message in system time.    
         Yields
         ------
         message_list : `list`
@@ -103,6 +106,7 @@ async def fan_out_msg(
     await producer.start()
     logging.info(f"sending msg {data}")
     await producer.send_and_wait(fan_out_topic, data)
+    # TODO Review if flush needed.
     await producer.flush()
     await producer.stop()
 
@@ -269,6 +273,8 @@ async def main() -> None:
                                      "it's not an observation.")
                         continue
 
+                    fan_out_delivery_time = time.time()
+
                     '''
                     # Temporary disable so we can see older messages for testing.
 
@@ -323,6 +329,7 @@ async def main() -> None:
                                 next_visit_message_updated.add_detectors(
                                     dataclasses.asdict(next_visit_message_updated),
                                     latiss_active_detectors,
+                                    fan_out_delivery_time,
                                 )
                             )
                             fan_out_topic = fan_out_latiss_topic
@@ -334,6 +341,7 @@ async def main() -> None:
                                     dataclasses.asdict(next_visit_message_updated),
                                     # Just use ComCam active detector config.
                                     lsstcomcam_active_detectors,
+                                    fan_out_delivery_time,
                                 )
                             )
                             fan_out_topic = fan_out_comcamsim_topic
@@ -356,6 +364,7 @@ async def main() -> None:
                                         next_visit_message_updated.add_detectors(
                                             dataclasses.asdict(next_visit_message_updated),
                                             hsc_active_detectors,
+                                            fan_out_delivery_time,
                                         )
                                     )
                                     fan_out_topic = fan_out_hsc_topic
@@ -366,6 +375,7 @@ async def main() -> None:
                                         next_visit_message_updated.add_detectors(
                                             dataclasses.asdict(next_visit_message_updated),
                                             hsc_active_detectors_59134,
+                                            fan_out_delivery_time,
                                         )
                                     )
                                     fan_out_topic = fan_out_hsc_topic
@@ -376,6 +386,7 @@ async def main() -> None:
                                         next_visit_message_updated.add_detectors(
                                             dataclasses.asdict(next_visit_message_updated),
                                             hsc_active_detectors_59142,
+                                            fan_out_delivery_time,
                                         )
                                     )
                                     fan_out_topic = fan_out_hsc_topic
@@ -386,6 +397,7 @@ async def main() -> None:
                                         next_visit_message_updated.add_detectors(
                                             dataclasses.asdict(next_visit_message_updated),
                                             hsc_active_detectors_59150,
+                                            fan_out_delivery_time,
                                         )
                                     )
                                     fan_out_topic = fan_out_hsc_topic
@@ -396,6 +408,7 @@ async def main() -> None:
                                         next_visit_message_updated.add_detectors(
                                             dataclasses.asdict(next_visit_message_updated),
                                             hsc_active_detectors_59160,
+                                            fan_out_delivery_time,
                                         )
                                     )
                                     fan_out_topic = fan_out_hsc_topic