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Prometheus Exporter HttpListener for OpenTelemetry .NET

NuGet NuGet

An OpenTelemetry Prometheus exporter that configures an HttpListener instance for Prometheus to scrape.

Warning

This component is intended for dev inner-loop, there is no plan to make it production ready. Production environments should consider using OpenTelemetry.Exporter.OpenTelemetryProtocol. Refer to the Getting Started with Prometheus and Grafana tutorial for more information.

Prerequisite

Steps to enable OpenTelemetry.Exporter.Prometheus.HttpListener

Step 1: Install Package

dotnet add package --prerelease OpenTelemetry.Exporter.Prometheus.HttpListener

Step 2: Add PrometheusHttpListener

var meterProvider = Sdk.CreateMeterProviderBuilder()
    .AddMeter(MyMeter.Name)
    .AddPrometheusHttpListener(
        options => options.UriPrefixes = new string[] { "http://localhost:9464/" })
    .Build();

UriPrefixes

Defines one or more URI (Uniform Resource Identifier) prefixes which will be used by the HTTP listener. The default value is ["http://localhost:9464/"].

Refer to HttpListenerPrefixCollection.Add(String) for more details.

ScrapeEndpointPath

Defines the Prometheus scrape endpoint path. Default value: "/metrics".

Troubleshooting

This component uses an EventSource with the name "OpenTelemetry-Exporter-Prometheus" for its internal logging. Please refer to SDK troubleshooting for instructions on seeing these internal logs.

References