Merge pull request ceph#64053 from anthonyeleven/oompaloompa

doc: Improve central config log documentation

Author: anthonyeleven

doc/man/8/ceph.rst

@@ -231,8 +231,8 @@ Usage::
 
     ceph config rm <who> <option>
 
-Subcommand ``log`` to show recent history of config changes. If `count` option
-is omitted it defaults to 10.
+Subcommand ``log`` to show recent history of central config changes. If the `count` argument
+is omitted the last ten entries are shown.
 
 Usage::
 

doc/mgr/dashboard.rst

@@ -1626,21 +1626,20 @@ debugging.
 
      .. prompt:: bash #
 
-        bin/ceph config set mgr mgr/dashboard/log_level debug
+        ceph config set mgr mgr/dashboard/log_level debug
 
 3. High log levels can result in considerable log volume, which can
-easily fill up your filesystem. Set a calendar reminder for an hour, a day,
-or a week in the future to revert this temporary logging increase.  This looks
-something like this:
+easily fill up your filesystem or central log store. Set a calendar reminder for an hour, a day,
+or a week in the future to revert a temporary logging increase. Any current, non-default setting
+may be shown with the below command:
 
    .. prompt:: bash #
 
-      ceph config log
+      ceph config dump | grep mgr/dashboard/log_level
 
    ::
-
       ...
-      --- 11 --- 2020-11-07 11:11:11.960659 --- mgr.x/dashboard/log_level = debug ---
+      mgr advanced  mgr/dashboard/log_level debug
       ...
     
    .. prompt:: bash #