Werk #13205: mtr: Fix performance graphs

Component	Checks & agents
Title	mtr: Fix performance graphs
Date	Sep 3, 2021
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.1.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 2.0.0p10 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

The performance graphs of the check plugin mtr, which monitors network diagnostiscs produced by MTR, were crashing with

Cannot calculate graph recipes Syntax error in expression ...

This has been fixed.

To the list of all Werks