Werk #14050: mssql_counters: Fix crash in parsing mssql_counters

Component	Checks & agents
Title	mssql_counters: Fix crash in parsing mssql_counters
Date	May 16, 2022
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.2.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT 2.1.0 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

Parsing mssql_counters failed for timestamps in format "%d.%m.%Y". Now, we additionally support this format.

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