Strange Null messages

[bobjana]

Please explain:

photon_1                | 2017-07-08 01:50:34.102 DEBUG 1 --- [      channel-5] i.m.t.s.s.SharedSocketServerChannel      : Received a channel op closed message MuonMessage{id='bb489a94-3360-4ce5-96bf-74bf1d17f5b1', created=1499478573444, targetServiceName='null', sourceServiceName='photonlite', protocol='null', step='ChannelFailure', status=success, contentType='text/plain', channelOperation=closed}

[daviddawson]

This is a coordination message in the connections. When a connection from a remote service closes, the transport layer detects this and sends this message up the stack to internally to free resources allocated to that connection.