gstlal_ll_inspiral_event_uploader: rename duplicated heartbeat variable

gstlal-inspiral/bin/gstlal_ll_inspiral_event_uploader

@@ -157,7 +157,7 @@ class EventUploader(events.EventProcessor):
 		self.upload_topic = f'gstlal.{self.tag}.{topic_prefix}uploads'
 
 		### heartbeat settings
-		self.last_heartbeat = 0.0
+		self.last_inspiral_heartbeat = 0.0
 		self.heartbeat_write = inspiral.now()
 
 		### set up aggregator sink
@@ -175,8 +175,8 @@ class EventUploader(events.EventProcessor):
 		### process heartbeat messages from inspiral jobs
 		if message.key() and 'heartbeat' == message.key().decode('UTF-8'):
 			heartbeat = json.loads(message.value())
-			if heartbeat['time'] > self.last_heartbeat:
-				self.last_heartbeat = heartbeat['time']
+			if heartbeat['time'] > self.last_inspiral_heartbeat:
+				self.last_inspiral_heartbeat = heartbeat['time']
 
 		### process candidate event
 		else:
@@ -309,7 +309,7 @@ class EventUploader(events.EventProcessor):
 		# jobs should send heartbeats every 10 minutes
 		now = inspiral.now()
 		if now - self.heartbeat_write > 15*60:
-			state = 0 if now - self.last_heartbeat > 15*60 else 1
+			state = 0 if now - self.last_inspiral_heartbeat > 15*60 else 1
 			data = {'heartbeat': {'heartbeat_tag': {'time': [int(now)], 'fields': {'data': [state]}}}}
 
 			logging.debug(f'Storing heartbeat state {state} to influx...')