.NET Client library for prometheus.io

It's a fork of prometheus-net, prometheus-net didn't develop a long time. This is alternative was created with the possibility of rapid development:

• Support and .
• More Extensions. Extensions extracted to packages.
• There are differences in the internal implementation: MetricServer, MetricPusher, Middleware.
• Each build is publish to MyGet. There is an opportunity to test development versions.
• All developments in prometheus-net will be analyzed and will implement as necessary.
• The goal is to be able to flexibly write extensions. And keep the speed of development.

dotnet add package Prometheus.Client

Examples

Prometheus Docs

With Prometheus.Client.AspNetCore:

public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory, IApplicationLifetime appLifetime)
{
    app.UsePrometheusServer();
}

Without extensions:

[Route("[controller]")]
public class MetricsController : Controller
{
    [HttpGet]
    public void Get()
    {
        Response.StatusCode = 200;
        using (var outputStream = Response.Body)
        {
            ScrapeHandler.Process(CollectorRegistry.Instance, outputStream);
        }
    }
}

For collect http requests, use Prometheus.Client.HttpRequestDurations. It does not depend of Prometheus.Client.AspNetCore, however together it's very convenient to use:

public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory, IApplicationLifetime appLifetime)
{
    app.UsePrometheusServer();
    app.UsePrometheusRequestDurations(); 
}

Four types of metric are offered: Counter, Gauge, Summary and Histogram. See the documentation on metric types and instrumentation best practices on how to use them.

Counters go up, and reset when the process restarts.

var counter = Metrics.CreateCounter("myCounter", "some help about this");
counter.Inc(5.5);

Gauges can go up and down.

var gauge = Metrics.CreateGauge("gauge", "help text");
gauge.Inc(3.4);
gauge.Dec(2.1);
gauge.Set(5.3);

Summaries track the size and number of events.

var summary = Metrics.CreateSummary("mySummary", "help text");
summary.Observe(5.3);

Histograms track the size and number of events in buckets. This allows for aggregatable calculation of quantiles.

var hist = Metrics.CreateHistogram("my_histogram", "help text", buckets: new[] { 0, 0.2, 0.4, 0.6, 0.8, 0.9 });
hist.Observe(0.4);

The default buckets are intended to cover a typical web/rpc request from milliseconds to seconds. They can be overridden passing in the buckets argument.

All metrics can have labels, allowing grouping of related time series.

See the best practices on naming and labels.

Taking a counter as an example:

var counter = Metrics.CreateCounter("myCounter", "help text", labelNames: new []{ "method", "endpoint"});
counter.Labels("GET", "/").Inc();
counter.Labels("POST", "/cancel").Inc();

AspNetCore Middleware: Prometheus.Client.AspNetCore

dotnet add package Prometheus.Client.AspNetCore

Standalone host: Prometheus.Client.MetricServer

dotnet add package Prometheus.Client.MetricServer

Push metrics to a PushGateaway: Prometheus.Client.MetricPusher

dotnet add package Prometheus.Client.MetricPusher

Collect http requests duration: Prometheus.Client.HttpRequestDurations

dotnet add package Prometheus.Client.HttpRequestDurations

Contributions to the package are always welcome!

• Report any bugs or issues you find on the issue tracker.
• You can grab the source code at the package's git repository.

If you are having problems, send a mail to prometheus@phnx47.net. I will try to help you.

I would also very much appreciate your support by buying me a coffee.

All contents of this package are licensed under the MIT license.