[receiver/expvar] Fix bug where measurement is recorded into wrong metric. #13172
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Description:
Noticed a bug where the
mSpanSysvalue was higher than it should be. Turns out we were recording tomCacheSysvalue to that metric as well. This resulted in nomCacheSysmetric and an incorrectmSpanSysmetric. This PR fixes the issue.Link to tracking Issue: #13171
Testing:
The tests have been altered to expect the correct metrics, they were previously expecting slightly incorrect metrics.