[Bugs] [Bug 1261700] New: Feature: Periodic FOP statistics dumps for v3.6.x/v3.7.x

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1261700

            Bug ID: 1261700
           Summary: Feature: Periodic FOP statistics dumps for
                    v3.6.x/v3.7.x
           Product: GlusterFS
           Version: 3.6.6
         Component: core
          Severity: medium
          Assignee: bugs at gluster.org
          Reporter: rwareing at fb.com
                CC: bugs at gluster.org, gluster-bugs at redhat.com



Created attachment 1071977
  --> https://bugzilla.redhat.com/attachment.cgi?id=1071977&action=edit
Patch for stats dump code.

Description of problem:
Patch to add periodic JSON dumps of FOP latency & hit rate statistics from the
io-stats translator.  Dumps are controlled by the
diagnostics.stats-dump-interval <dump interval sec> option and stored in
/var/lib/glusterd/stats under their respective FUSE, gNFSd or brick instance.

This is immensely useful to reliably ferret out diagnostics & performance
metrics from GlusterFS for injection into a robust analytics backend for future
analysis or alarming.  Heavily in-use here at Facebook.

Patches clean onto the release-3.6 or release-3.7 branches as of this bug
creation.

Version-Release number of selected component (if applicable):
v3.6.x or v3.7.x, should be trivial to port to master.

How reproducible:
100%

Steps to Reproduce:
N/A

Actual results:


Expected results:


Additional info:

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