ProtocolHandlerJSON: Invalid schema in message from fluentd

[Alessar]

Starting message of fluentd generates error, which can be found in mdsd-agent logs: ProtocolHandlerJSON: Error decoding message '[fluentd",1,1,[2,[worker",FT_STRING"],[message",FT_STRING"],[FluentdIngestTimestamp",FT_TIME"]],[0,fluentd worker is now running worker=0",[1526307205,0]]]' from fd 10: Invalid schema in message from fluentd, id 1: String was expected in field 0