Description of problem:

On a containerised 3.2 deployment, when we enable for example bluestore debug, the actual bluestore logs are not reaching the host journal.

Using the default logging options in the conf file

# cat /etc/ceph/ceph.conf | grep log
log file = /dev/null
mon cluster log file = /dev/null

Enable Bluestore debug

[root@servera ~]#  ceph daemon osd.11 config get debug_bluestore
{
    "debug_bluestore": "5/5"
}

We have no logs in the host journal

[root@servera ~]# journalctl -b | grep bluestore.Mempool

If we configure the osd to dump it0s log to a file we get the bluestore logs like expected:
[root@servera ~]#  ceph daemon osd.11 config get debug_bluestore
{
    "debug_bluestore": "5/5"
}
[root@servera ~]# ceph daemon osd.11 config set log_file /tmp/osd11.log
{
    "success": "log_file = '/tmp/osd11.log' "
}
[root@servera ~]# ceph daemon osd.11 log reopen
{}
[root@servera ~]# docker exec -it ceph-osd-11 cat /tmp/osd11.log | tail -2
2019-01-31 11:56:16.012799 7f1f5a3bb700  5 bluestore.MempoolThread(0x55645df471d0) _trim_shards cache_size: 2845415832 kv_alloc: 1218696969 kv_used: 1837362 meta_alloc: 1084479241 meta_used: 71604 data_alloc: 542239620 data_used: 0
2019-01-31 11:56:16.866433 7f1f5a3bb700  5 bluestore.MempoolThread(0x55645df471d0) _tune_cache_size target: 4294967296 heap: 75497472 unmapped: 22568960 mapped: 52928512 old cache_size: 2845415832 new cache size: 2845415832





Version-Release number of selected component (if applicable):

3.2

How reproducible:

Install Containerised 3.2 deployment 
Enable Bluestore Debug

Steps to Reproduce:
1.Install Containerised 3.2 deployment
2.Enable Bluestore Debug
3.

Actual results:

No Bluestore debug logs are present

Expected results:

The OSD debug logs should be present on the host journal

Additional info: