Comment 10 for bug 1401852

I will add some information about this to http://docs.mirantis.com/openstack/fuel/fuel-5.1/operations.html#logs-and-messages -- is it okay to mention Logstash? No details about configuring it or anything, just a mention that it is useful.

Let me slog through this discussion and see if I can come up with some meaningful information. Time is short -- if anyone wants to contribute anything, it's welcome.