doc: explain about logging levels

Signed-off-by: liuchang0812 <liuchang0812@gmail.com>

diff --git a/doc/rados/troubleshooting/log-and-debug.rst b/doc/rados/troubleshooting/log-and-debug.rst
index d618a880d95f3ad80ef50a46b6df2e407bd7e1c9..dabe8412a849505862b7c80e244ac8b13ab9f117 100644 (file)
--- a/doc/rados/troubleshooting/log-and-debug.rst
+++ b/doc/rados/troubleshooting/log-and-debug.rst
@@ -150,7 +150,7 @@ Each subsystem has a logging level for its output logs, and for its logs
 in-memory. You may set different values for each of these subsystems by setting
 a log file level and a memory level for debug logging. Ceph's logging levels
 operate on a scale of ``1`` to ``20``, where ``1`` is terse and ``20`` is
-verbose. In general, the logs in-memory are not sent to the output log unless:
+verbose [#]_ . In general, the logs in-memory are not sent to the output log unless:
 
 - a fatal signal is raised or
 - an ``assert`` in source code is triggered or
@@ -555,3 +555,5 @@ RADOS Gateway
 :Type: Boolean
 :Required: No
 :Default: ``false``
+
+.. [#] there are levels >20 in some rare cases and that they are extremely verbose.