[Bugs] [Bug 1643519] New: Provide an option to silence glfsheal logs

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1643519

            Bug ID: 1643519
           Summary: Provide an option to silence glfsheal logs
           Product: GlusterFS
           Version: mainline
         Component: replicate
          Assignee: bugs at gluster.org
          Reporter: ravishankar at redhat.com
                CC: bugs at gluster.org



Description of problem:

Many monitoring/reporting solutions run 'gluster volume heal $volname info' and
its related subcommands very frequently (even once every minute), leading to
unnecessary filling up of the glfsheal logs. (See downstream BZs 1579293 and
1631851 for instance). The main intention of running these commands is to
process/consume the output displayed on stdout/xml format and not really the
gluster client logs which glfsheal (which is gfapi based) generates under
/var/log/glusterfs/glfsheal*.

Hence it is useful to have a --nolog option which will prevent the incessant
logging. 

Note that these logs are VERY helpful when debugging when heal-info is
unresponsive/hung/disconnected from bricks or when running split-brain
resolution commands. So the default log level is still kept at GF_LOG_INFO and
is changed to GF_LOG_NONE only when the command is invoked with the --nolog
flag.

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