Awesome

No longer maintained - see app metrics as an alternative

aspnet-metrics

dev branch build

Metrics.NET cross platform port

For a cross platform metrics solution based on Metrics.NET see App Metrics

AspNet.Metrics

AspNet Core integration for Metrics.NET

NuGet Releases | Dev Releases

AspNet.Metrics.PerformanceCounters

Provides configuration extensions to AspNet.Metrics allowing windows performance counters to be registered

NuGet Releases | Dev Releases

See the wiki for more info