Catch exception due to missing threshold zenpack

zenoss / ZenPacks.zenoss.ZenPackLib

This is a helper library for zenpacks.

http://zenpacklib.zenoss.com/

GNU General Public License v2.0

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Catch exception due to missing threshold zenpack #491

Closed yichi-lu closed 6 years ago

yichi-lu commented 6 years ago

Fixes ZPS-1732

Thresholds can be optional, like capacity threshold. If the threshold ZP is not installed, and a ZP requests the particular threshold type, then zenoss should just ignore the request, and the logger should generate an error message.