Werk #14086: Check plugins with Nagios core: Do not drop integer zeros in metrics

Component	Checks & agents
Title	Check plugins with Nagios core: Do not drop integer zeros in metrics
Date	May 9, 2022
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.0.0p24 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

Using the Nagios core, metrics of value integer zero had been dropped.

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