One agent seems to have crash and cannot come back, arenaserver is just complaining:
{"time":"2017-09-15T06:36:53Z","service":"commserver","message":"Connexion closed unexpectedly; EOF","context":{"hostname":"daf4a23cd795"}}
{"time":"2017-09-15T06:36:53Z","service":"arenaserver","message":"ERROR: could not set perception on agent cf472af7-fe5b-498b-928b-8bb80422ddc4","context":{"hostname":"daf4a23cd795"}}
{"time":"2017-09-15T06:36:53Z","service":"arenaserver","message":"ERROR: could not set perception on agent cf472af7-fe5b-498b-928b-8bb80422ddc4","context":{"hostname":"daf4a23cd795"}}
{"time":"2017-09-15T06:36:53Z","service":"arenaserver","message":"ERROR: could not set perception on agent cf472af7-fe5b-498b-928b-8bb80422ddc4","context":{"hostname":"daf4a23cd795"}}
{"time":"2017-09-15T06:36:53Z","service":"arenaserver","message":"ERROR: could not set perception on agent cf472af7-fe5b-498b-928b-8bb80422ddc4","context":{"hostname":"daf4a23cd795"}}
{"time":"2017-09-15T06:36:53Z","service":"arenaserver","message":"ERROR: could not set perception on agent cf472af7-fe5b-498b-928b-8bb80422ddc4","context":{"hostname":"daf4a23cd795"}}
{"time":"2017-09-15T06:36:53Z","service":"arenaserver","message":"ERROR: could not set perception on agent cf472af7-fe5b-498b-928b-8bb80422ddc4","context":{"hostname":"daf4a23cd795"}}
{"time":"2017-09-15T06:36:53Z","service":"arenaserver","message":"ERROR: could not set perception on agent cf472af7-fe5b-498b-928b-8bb80422ddc4","context":{"hostname":"daf4a23cd795"}}
{"time":"2017-09-15T06:36:53Z","service":"arenaserver","message":"ERROR: could not set perception on agent cf472af7-fe5b-498b-928b-8bb80422ddc4","context":{"hostname":"daf4a23cd795"}}
{"time":"2017-09-15T06:36:53Z","service":"arenaserver","message":"ERROR: could not set perception on agent cf472af7-fe5b-498b-928b-8bb80422ddc4","context":{"hostname":"daf4a23cd795"}}
{"time":"2017-09-15T06:36:53Z","service":"arenaserver","message":"ERROR: could not set perception on agent cf472af7-fe5b-498b-928b-8bb80422ddc4","context":{"hostname":"daf4a23cd795"}}
One agent seems to have crash and cannot come back, arenaserver is just complaining: