Index: leahi_dialin/dd/modules/substitution_pump.py
===================================================================
diff -u -r8ebb614a8c6e52b27d40ac5ef8b48aa22a4be73d -r034ef9887584984c3f261bfb748aa70994b9751b
--- leahi_dialin/dd/modules/substitution_pump.py	(.../substitution_pump.py)	(revision 8ebb614a8c6e52b27d40ac5ef8b48aa22a4be73d)
+++ leahi_dialin/dd/modules/substitution_pump.py	(.../substitution_pump.py)	(revision 034ef9887584984c3f261bfb748aa70994b9751b)
@@ -85,7 +85,7 @@
                                message = message)
 
         self.dd_substitution_pump_timestamp = timestamp
-        self.handler_execution_times.append(time.perf_counter() - start)
+        self.handler_execution_times.append((timestamp, message, time.perf_counter() - start))
 
     def cmd_substitution_pump_data_publish_interval_override(self, ms: int, reset: int = NO_RESET) -> int:
         """