ASP.NET Core 集成Prometheus+grafana

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Prometheus https://prometheus.io/

grafana https://grafana.com/

安装Prometheus

Linux 可以参考https://www.cnblogs.com/linkanyway/p/Configure-a-Prometheus-Monitoring-Server-with-a-Gr.html

windows:

下载地址：https://prometheus.io/download/

下载对应windows版本

解压后在命令行运行 prometheus.exe

然后访问 http://localhost:9090/

出现以下页面说明启动成功：

如果要添加监视服务器可以配置：prometheus.yml

global:
 scrape_interval:     15s
 evaluation_interval: 15s
scrape_configs:
 - job_name: 'prometheus'
   static_configs:
   - targets: ['localhost:9090']
 - job_name: 'node_exporter'
   scrape_interval: 5s
   static_configs:
   - targets: ['localhost:9100']

node-exporter

node-exporter是prometheus的服务提供者。

windows版本为：

https://github.com/martinlindhe/wmi_exporter

下载最新的版本。启动后的默认端口是9182

安装grafana

下载地址：https://grafana.com/grafana/download?platform=windows

本人选择的是压缩包下载，解压后在命令行运行 grafana-server.exe

访问http://localhost:3000/

出现以下页面说明启动成功

初始用户名和密码都是 admin

grafana配置prometheus数据源：

选择Prometheus数据源

配置仪表盘

在https://grafana.com/grafana/dashboards?orderBy=name&direction=asc选择合适的仪表盘

导入仪表板：

选择import

然后输入之前记录的id

选择prometheus的数据源,之后打开dashboard就可以看到漂亮的仪表盘了

AspNet Core 配置

参考 https://www.c-sharpcorner.com/article/reporting-metrics-to-prometheus-in-asp-net-core/

NuGet引用：prometheus-net.AspNetCore

public class Startup  
{  
    // others ...  
      
    public void Configure(IApplicationBuilder app, IHostingEnvironment env)  
    {  
        // others ...  
  
        app.UseMetricServer();  
    }  
}

启动应用程序访问 /metrics 出现以下页面说明配置成功

例如，我们希望能够统计每个API请求次数（200表示成功，500表示错误）。

public class RequestMiddleware  
{  
    private readonly RequestDelegate _next;  
    private readonly ILogger _logger;  
  
    public RequestMiddleware(  
        RequestDelegate next  
        , ILoggerFactory loggerFactory  
        )  
    {  
        this._next = next;  
        this._logger = loggerFactory.CreateLogger<RequestMiddleware>();  
    }  
      
    public async Task Invoke(HttpContext httpContext)  
    {  
        var path = httpContext.Request.Path.Value;  
        var method = httpContext.Request.Method;  
  
        var counter = Metrics.CreateCounter("prometheus_demo_request_total", "HTTP Requests Total", new CounterConfiguration  
        {  
            LabelNames = new[] { "path", "method", "status" }  
        });  
  
        var statusCode = 200;  
  
        try  
        {  
            await _next.Invoke(httpContext);  
        }  
        catch (Exception)  
        {  
            statusCode = 500;  
            counter.Labels(path, method, statusCode.ToString()).Inc();  
  
            throw;  
        }  
          
        if (path != "/metrics")  
        {  
            statusCode = httpContext.Response.StatusCode;  
            counter.Labels(path, method, statusCode.ToString()).Inc();  
        }  
    }  
}  
  
public static class RequestMiddlewareExtensions  
{          
    public static IApplicationBuilder UseRequestMiddleware(this IApplicationBuilder builder)  
    {  
        return builder.UseMiddleware<RequestMiddleware>();  
    }  
}

修改Startup

public void Configure(IApplicationBuilder app, IHostingEnvironment env)  
{  
    // others ...  
  
    app.UseMetricServer();  
  
    app.UseRequestMiddleware();  
}

修改api代码

[HttpGet]  
public ActionResult<IEnumerable<string>> Get()  
{  
    if(new System.Random().NextDouble() > 0.5)  
    {  
        throw new System.Exception("test exception");  
    }  
  
    return new string[] { "value1", "value2" };  
}

然后在prometheus.yml添加配置

scrape_configs:  
- job_name: mydemo  
  scrape_interval: 15s  
  scrape_timeout: 10s  
  metrics_path: /metrics  
  scheme: http  
  static_configs:  
  - targets:  
    - localhost:44363