Werk #4563: Fix issue with @ in metric title

Component	Metrics system
Title	Fix issue with @ in metric title
Date	Jul 14, 2017
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.5.0i1 Not yet released Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.5.0i1 Not yet released Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.5.0i1 Not yet released Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.5.0i1 Not yet released Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.5.0i1 Not yet released Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.5.0i1 Not yet released Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.5.0i1 Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.4.0p9 Checkmk Enterprise (CEE), Checkmk MSP (CME)

The @ sign is used to append a custom unit when used within metric titles. This prevents graphs from being displayed when an @ without a special meaning appears within a metric title. The graphing system now checks for an existing unit within the metric title and leaves the title untouched otherwise.

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