Incomplete/missing get_store_prefixes implementations in OSDMonitor/MDSMonitor
3 - minor
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Crash signature (v1):
Crash signature (v2):
Based on comments from https://github.com/ceph/ceph/pull/17929#issuecomment-331768992 -- it looks like we should have been updating get_store_prefixes in order for newly-joined mons to work properly, but we weren't.