Question 1

How to set up Prometheus.Client for HTTP metrics in ASP.NET Core?

Accepted Answer

Install the Prometheus.Client.AspNetCore and Prometheus.Client.HttpRequestDurations packages, then use app.UsePrometheusServer() and app.UsePrometheusRequestDurations() in your Startup class. This automatically exposes metrics and tracks request durations without manual instrumentation.

Question 2

Prometheus.Client vs prometheus-net: which should I choose?

Accepted Answer

Prometheus.Client is a hard fork focused on extensibility and performance, with optimizations like ValueTuple labels, while prometheus-net is the original with potentially more stability. Choose Prometheus.Client if you need community-driven enhancements and memory efficiency; otherwise, prometheus-net might be safer for legacy integration.

Question 3

What are the performance benchmarks for Prometheus.Client?

Accepted Answer

The README links to benchmark descriptions in the docs, highlighting minimal allocation and high speed in metric collection. However, actual performance depends on your use case, such as label cardinality and update frequency.

Question 4

How to push metrics to Prometheus PushGateway with this library?

Accepted Answer

Use the Prometheus.Client.MetricPusher package to create a MetricPusher instance, or the HostedService extension for background pushing. Configure it with your PushGateway URL to periodically send metrics without Prometheus scraping.

Question 5

Does Prometheus.Client work with .NET Framework or only .NET Core?

Accepted Answer

It supports .NET Standard, so it's compatible with .NET Framework, .NET Core, and .NET 5+. Check the NuGet package for specific version support, as some extensions may have additional requirements.

Question 6

How to add custom labels to metrics efficiently?

Accepted Answer

Use the ValueTuple-based label support introduced in v4, as shown in the README examples with CreateCounter and WithLabels using tuples like ("GET", "/"). This reduces memory allocation compared to traditional string arrays.

Prometheus.Client

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