osd wasn't marked as down/out when it's storage folder was deleted

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I've deleted:
rm -rf /var/lib/ceph/osd/ceph-0/current

folder but looks like ceph never noticed that:
ceph osd df
ID WEIGHT  REWEIGHT SIZE   USE    AVAIL  %USE  VAR  PGS
 4 0.09270  1.00000 97231M 54661M 42570M 56.22 1.34  95
 0 0.09270  1.00000 97231M   139M 97091M  0.14 0.00  69
 5 0.09270  1.00000 97231M 42603M 54627M 43.82 1.05  73
 1 0.09270  1.00000 97231M 51950M 45280M 53.43 1.28  91
 6 0.09270  1.00000 97231M 50656M 46575M 52.10 1.25  88
 2 0.09270  1.00000 97231M 43896M 53334M 45.15 1.08  76
              TOTAL   569G   238G   331G 41.81
MIN/MAX VAR: 0.00/1.34  STDDEV: 19.15

ceph -w:
     health HEALTH_OK

Waited approximately an hour and it never reported warning, nor copied data back.
OSD log constantly filled with:
2015-12-07 15:31:06.096017 7f007505d700 -1 filestore(/var/lib/ceph/osd/ceph-0) could not find 1/08ce93cf/rbd_data.853f1f358346.00000000000013ca/head in index: (2) No such file or directory
2015-12-07 15:31:06.096023 7f007505d700  0 filestore(/var/lib/ceph/osd/ceph-0) write couldn't open 1.4f_head/1/08ce93cf/rbd_data.853f1f358346.00000000000013ca/head: (2) No such file or directory
2015-12-07 15:31:06.096044 7f007505d700 -1 filestore(/var/lib/ceph/osd/ceph-0) could not find 1/08ce93cf/rbd_data.853f1f358346.00000000000013ca/head in index: (2) No such file or directory
2015-12-07 15:31:06.249584 7f007585e700 -1 filestore(/var/lib/ceph/osd/ceph-0) could not find 1/08ce93cf/rbd_data.853f1f358346.00000000000013ca/head in index: (2) No such file or directory
2015-12-07 15:31:06.249641 7f007585e700 -1 filestore(/var/lib/ceph/osd/ceph-0) could not find 1/08ce93cf/rbd_data.853f1f358346.00000000000013ca/head in index: (2) No such file or directory
2015-12-07 15:31:06.249653 7f007585e700  0 filestore(/var/lib/ceph/osd/ceph-0) write couldn't open 1.4f_head/1/08ce93cf/rbd_data.853f1f358346.00000000000013ca/head: (2) No such file or directory
2015-12-07 15:31:06.249692 7f007585e700 -1 filestore(/var/lib/ceph/osd/ceph-0) could not find 1/08ce93cf/rbd_data.853f1f358346.00000000000013ca/head in index: (2) No such file or directory

Is it a bug or intended behavior?
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