asp.net core接入prometheus2-自定义指标

前提

了解一下asp.net core接入prometheus快速入门
https://blog.csdn.net/qq_36437991/article/details/139064138

新建.net 8空web项目

安装下面三个包

<PackageReference Include="OpenTelemetry.Exporter.Prometheus.AspNetCore" Version="1.8.0-rc.1" />
<PackageReference Include="OpenTelemetry.Extensions.Hosting" Version="1.8.1" />
<PackageReference Include="System.Diagnostics.DiagnosticSource" Version="8.0.1" />

创建指标

HatCoMetrics.cs

using System.Diagnostics.Metrics;

namespace PrometheusStu03;

/// <summary>
/// 红帽子指标
/// </summary>
public class HatCoMetrics
{
    private readonly Counter<int> _hatsSold;

    public HatCoMetrics(IMeterFactory meterFactory)
    {
        //红帽子商店
        var meter = meterFactory.Create("HatCo.Store");
        //冲帽子商店销量
        _hatsSold = meter.CreateCounter<int>("hatco.store.hats_sold",unit:"{hats}",description:"我们商店出售的帽子数量");
    }

    /// <summary>
    /// 增加数量
    /// </summary>
    /// <param name="quantity"></param>
    public void HatsSold(int quantity)
    {
        _hatsSold.Add(quantity);
    }
}

指标收集

修改Program.cs

using OpenTelemetry.Metrics;

namespace PrometheusStu03;

public class Program
{
    public static void Main(string[] args)
    {
        var builder = WebApplication.CreateBuilder(args);
        builder.Services.AddSingleton<HatCoMetrics>();
        var app = builder.Build();
        app.UseOpenTelemetryPrometheusScrapingEndpoint();
        app.MapGet("/", (HatCoMetrics metrics) =>
        {
            //可以将销量存放到数据库中
            metrics.HatsSold(1);
            return "销售数量加1";
        });
        app.Run();
    }
}

这样访问就能增加帽子的销量了
在这里插入图片描述

指标展示

修改Program.cs

using OpenTelemetry.Metrics;

namespace PrometheusStu03;

public class Program
{
    public static void Main(string[] args)
    {
        var builder = WebApplication.CreateBuilder(args);
        builder.Services.AddSingleton<HatCoMetrics>();
        builder.Services.AddOpenTelemetry()
            .WithMetrics(builder2 =>
            {
                builder2.AddPrometheusExporter();
                builder2.AddMeter("HatCo.Store");
            });
        var app = builder.Build();
        app.UseOpenTelemetryPrometheusScrapingEndpoint();
        app.MapGet("/", (HatCoMetrics metrics) =>
        {
            //可以将销量存放到数据库中
            metrics.HatsSold(1);
            return "销售数量加1";
        });
        app.Run();
    }
}

在这里插入图片描述

展示内置指标

builder.Services.AddOpenTelemetry()
  .WithMetrics(builder2 =>
  {
      builder2.AddPrometheusExporter();
      builder2.AddMeter("Microsoft.AspNetCore.Hosting",
           "Microsoft.AspNetCore.Server.Kestrel","HatCo.Store");
  });