doc: Added logging reference under configuration section.

Signed-off-by: John Wilkins <john.wilkins@inktank.com>

diff --git a/doc/config-cluster/log-and-debug-ref.rst b/doc/config-cluster/log-and-debug-ref.rst
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+========================================
+ Logging and Debugging Config Reference
+========================================
+
+Logging and debugging settings are not required, but you may override default settings 
+as needed. Ceph supports the following settings:
+
+Logging
+=======
+
+``log file``
+
+:Desription: The location of the logging file for your cluster.
+:Type: String
+:Required: No
+:Default: ``/var/log/ceph/$cluster-$name.log``
+
+
+``log max new``
+
+:Description: The maximum number of new log files.
+:Type: Integer
+:Required: No
+:Default: ``1000``
+
+
+``log max recent``
+
+:Description: The maximum number of recent events to include in a log file.
+:Type: Integer
+:Required:  No
+:Default: ``1000000``
+
+
+``log to stderr``
+
+:Description: Determines if logging messages should appear in ``stderr``.
+:Type: Boolean
+:Required: No
+:Default: ``true``
+
+
+``err to stderr``
+
+:Description: Determines if error messages should appear in ``stderr``.
+:Type: Boolean
+:Required: No
+:Default: ``true``
+
+
+``log to syslog``
+
+:Description: Determines if logging messages should appear in ``syslog``.
+:Type: Boolean
+:Required: No
+:Default: ``false``
+
+
+``err to syslog``
+
+:Description: Determines if error messages should appear in ``syslog``.
+:Type: Boolean
+:Required: No
+:Default: ``false``
+
+
+``log flush on exit``
+
+:Description: Determines if Ceph should flush the log files after exit.
+:Type: Boolean
+:Required: No
+:Default: ``true``
+
+
+``clog to monitors``
+
+:Description: Determines if ``clog`` messages should be sent to monitors.
+:Type: Boolean
+:Required: No
+:Default: ``true``
+
+
+``clog to syslog``
+
+:Description: Determines if ``clog`` messages should be sent to syslog.
+:Type: Boolean
+:Required: No
+:Default: ``false``
+
+
+``mon cluster log to syslog``
+
+:Description: Determines if the cluster log should be output to the syslog.
+:Type: Boolean
+:Required: No
+:Default: ``false``
+
+
+``mon cluster log file``
+
+:Description: The location of the cluster's log file. 
+:Type: String
+:Required: No
+:Default: ``/var/log/ceph/$cluster.log``
+
+
+
+OSD
+===
+
+
+``osd debug drop ping probability``
+
+:Description: ?
+:Type: Double
+:Required: No
+:Default: 0
+
+
+``osd debug drop ping duration``
+
+:Description: The duration ?
+:Type: Integer
+:Required: No
+:Default: 0
+
+``osd debug drop pg create probability``
+
+:Description: 
+:Type: Integer
+:Required: No
+:Default: 0
+
+``osd debug drop pg create duration``
+
+:Description: ?
+:Type: Double
+:Required: No
+:Default: 1
+
+``osd preserve trimmed log``
+
+:Description: ?
+:Type: Boolean
+:Required: No
+:Default: ``false``
+
+``osd tmapput sets uses tmap``
+
+:Description: For debug only. ???
+:Type: Boolean
+:Required: No
+:Default: ``false``
+
+
+``osd min pg log entries``
+
+:Description: The minimum number of log entries for placement groups. 
+:Type: 32-bit Unsigned Integer
+:Required: No
+:Default: 1000
+
+``osd op log threshold``
+
+:Description: How many op log messages to show up in one pass. 
+:Type: Integer
+:Required: No
+:Default: 5
+
+
+
+Filestore
+=========
+
+``filestore debug omap check``
+
+:Description: Checks the ``omap``. This is an expensive operation.
+:Type: Boolean
+:Required: No
+:Default: 0
+
+
+MDS
+===
+
+
+``mds debug scatterstat``
+
+:Description: ?
+:Type: Boolean
+:Required: No
+:Default: ``false``
+
+
+``mds debug frag``
+
+:Description: 
+:Type: Boolean
+:Required: No
+:Default: ``false``
+
+
+``mds debug auth pins``
+
+:Description: ?
+:Type: Boolean
+:Required: No
+:Default: ``false``
+
+
+``mds debug subtrees``
+
+:Description: ?
+:Type: Boolean
+:Required: No
+:Default: ``false``
+
+
+
+RADOS Gateway
+=============
+
+
+``rgw log nonexistent bucket``
+
+:Description: Should we log a non-existent buckets?
+:Type: Boolean
+:Required: No
+:Default: ``false``
+
+
+``rgw log object name``
+
+:Description: Should an object's name be logged. // man date to see codes (a subset are supported)
+:Type: String
+:Required: No
+:Default: ``%Y-%m-%d-%H-%i-%n``
+
+
+``rgw log object name utc``
+
+:Description: Object log name contains UTC?
+:Type: Boolean
+:Required: No
+:Default: ``false``
+
+
+``rgw enable ops log``
+
+:Description: Enables logging of every RGW operation.
+:Type: Boolean
+:Required: No
+:Default: ``true``
+
+
+``rgw enable usage log``
+
+:Description: Enable logging of RGW's bandwidth usage.
+:Type: Boolean
+:Required: No
+:Default: ``true``
+
+
+``rgw usage log flush threshold``
+
+:Description: Threshold to flush pending log data.
+:Type: Integer
+:Required: No
+:Default: ``1024``
+
+
+``rgw usage log tick interval``
+
+:Description: Flush pending log data every ``s`` seconds.
+:Type: Integer
+:Required: No
+:Default: 30
+
+
+``rgw intent log object name``
+
+:Description: 
+:Type: String
+:Required: No
+:Default: ``%Y-%m-%d-%i-%n``
+
+
+``rgw intent log object name utc``
+
+:Description: Include a UTC timestamp in the intent log object name.
+:Type: Boolean
+:Required: No
+:Default: ``false``
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