Merge branch 'master-athena-monitoring-onl-converntion-run3' into 'master'

AthenaMonitoring: Set up online convention in online for Run 3 monitoring

See merge request atlas/athena!37782

Control/AthenaMonitoring/python/AthMonitorCfgHelper.py

@@ -135,8 +135,8 @@ class AthMonitorCfgHelper(object):
         pathToSet = self.inputFlags.DQ.FileKey+('/%s' % topPath if topPath else '')
         array.broadcast('HistPath',pathToSet)
         array.broadcast('UseCache',True)
-        # in the future, autodetect if we are online or not
-        array.broadcast('convention','OFFLINE')
+        convention = 'ONLINE' if self.inputFlags.Common.isOnline else 'OFFLINE'
+        array.broadcast('convention', convention)
         array.broadcast('defaultDuration',defaultDuration)
         alg.GMTools += array.toolList()
         return array