I think I ran in to this before but I forget the fix:

HEALTH_WARN 1 stray host(s) with 1 daemon(s) not managed by cephadm

[WRN] CEPHADM_STRAY_HOST: 1 stray host(s) with 1 daemon(s) not managed by cephadm

stray host cn06.ceph.fu.intra has 1 stray daemons: ['mon.cn03']

Pacific 16.2.11

How do I clear this?

Thanks

-jeremy