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Monitoring .NET Applications with Prometheus

Professional

You can instrument your .NET application with prometheus-net and let the Glouton agent scrape its /metrics endpoint.

Install the client library

dotnet add package prometheus-net.AspNetCore

Minimal example

The snippet below defines a counter and exposes it on http://localhost:8080/metrics using ASP.NET Core:

using Prometheus;

var requestsTotal = Metrics.CreateCounter(
    "myapp_requests_total",
    "Total number of processed requests.");

var builder = WebApplication.CreateBuilder(args);
var app = builder.Build();

app.MapGet("/", () =>
{
    requestsTotal.Inc();
    return "Hello";
});

app.MapMetrics();
app.Run("http://0.0.0.0:8080");

Scrape with Glouton

Configure Glouton to scrape your application by adding the following to /etc/glouton/conf.d/50-prometheus-metrics.conf:

metric:
  prometheus:
    targets:
      - url: "http://localhost:8080/metrics"
        name: "my_dotnet_application"
        allow_metrics:
          - "myapp_requests_total"

Restart the agent to apply the configuration. See Prometheus Monitoring for the full list of options, including Docker label auto-discovery and Kubernetes annotations.

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