Werk #15159: Send metrics without perf data to backend

Component	Metrics system
Title	Send metrics without perf data to backend
Date	May 19, 2023
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.3.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME)

We erroneously rejected any metrics without performance data. Indeed, this prevented users to log state changes for those metrics.

To the list of all Werks