Bug 1365828 - mongo log spam

[Ian Booth]

https://bugs.launchpad.net/juju-core/+bug/1365828

Hi mongo experts

Mongo is filling up syslog with lots of spam.
eg, as reported by a customer, https://clbin.com/XZ63i

I have reduced this a little by tweaking the roles used to log in to the "juju"
and "presence" databases, so the warnings are gone. But the spam remains.

It seems to me these Mongo bugs might be relevant:

https://jira.mongodb.org/browse/SERVER-5847
https://jira.mongodb.org/browse/SERVER-5952

I can't see from a brief look what Juju might be doing to directly cause the
spam, nor what we can do to remove it.

Does anyone with more Mongo knowledge have any insight as to what we can do to
address this problem?