log open marker
We used to have a marker every time the log is (re)opened that included process name, pid, log file, and ceph version (with git sha1). This was extremely useful when debugging because searching for 'ceph version' would jump to the previous/next daemon restart and/or crash dump.
Not sure if some or all of this should be included when logging to syslog (vs a file). Probably everything but the filename (obviously)?