::

   pgcopydb stream sentinel get: Get the sentinel table values
   usage: pgcopydb stream sentinel get 
   
     --json           Format the output using JSON
     --startpos       Get only the startpos value
     --endpos         Get only the endpos value
     --apply          Get only the apply value
     --write-lsn      Get only the write LSN value
     --flush-lsn      Get only the flush LSN value
     --replay-lsn     Get only the replay LSN value
   
