PerformanceCountersKeepExistingCounters Property MSBuild Extension Pack Help 4.0.12.0
Sets a value whether existing performance counters of the given category should be preserved when adding new ones.

Namespace: MSBuild.ExtensionPack.Computer
Assembly: MSBuild.ExtensionPack (in MSBuild.ExtensionPack.dll) Version: 4.0.0.0
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Reference