Ceph » mgr

i keep seeing this:

2017-04-04 16:07:15.424940 7fe1194cc700 10 mon.f@0(leader).paxosservice(mgr 1..58) dispatch 0x5600c4186000 mgrbeacon mgr.x(16873bd6-f375-44d6-a504-d962f3ede1fc,4104, -, 0) v2 from client.4104 172.21.15.102:0/2688981452 con 0x5600c40fd0e0
2017-04-04 16:07:15.424953 7fe1194cc700  5 mon.f@0(leader).paxos(paxos active c 754..1333) is_readable = 1 - now=2017-04-04 16:07:15.424954 lease_expire=2017-04-04 16:07:19.922681 has v0 lc 1333
2017-04-04 16:07:15.424970 7fe1194cc700  4 MgrMonitor preprocess_beacon beacon from 4104
2017-04-04 16:07:15.424973 7fe1194cc700 20 is_capable service=mgr command= exec on cap allow *
2017-04-04 16:07:15.424975 7fe1194cc700 20  allow so far , doing grant allow *
2017-04-04 16:07:15.424977 7fe1194cc700 20  allow all
2017-04-04 16:07:15.424981 7fe1194cc700  4 MgrMonitor prepare_beacon beacon from 4104
2017-04-04 16:07:15.424985 7fe1194cc700  4 MgrMonitor prepare_beacon learned address - (was :/0)
2017-04-04 16:07:15.424989 7fe1194cc700  4 MgrMonitor prepare_beacon updating map
2017-04-04 16:07:15.424994 7fe1194cc700 10 mon.f@0(leader).paxosservice(mgr 1..58)  setting proposal_timer 0x5600c3b4c860 with delay of 0.05
2017-04-04 16:07:15.475116 7fe11bcd1700 10 mon.f@0(leader).paxosservice(mgr 1..58) propose_pending

but i can't figure out why the beacon says :/0 and not - for entity_addr_t.