Lower nagios check for "offset" criticality to WARNING

[Ryan Farrell]

During some transient behavior on a customer cloud we were inundated with CRITICAL alerts against NTP Offset: "offset is out of range (nan) - must be between -0.050000 and 0.050000".

These alerts did not result in any other apparent degraded behavior for other applications and we believe that we can lower the criticality of these particular messages to WARNING, instead of CRITICAL.

[Bryan Quigley (bryanquigley)]

I think the +/- 0.05 makes sense - it's lined up with when Ceph would start warning.

If we do want to have a Warning set and then an Critical set that would make sense to me.

It could be warning at 0.05 and then critical at say .25?

[Xav Paice (xavpaice)]

Related, or possibly duplicate: https://bugs.launchpad.net/ntp-charm/+bug/1839238