使用网关之后我们面临的一个问题就是监控，我们需要知道网关的实时状态，比如当前的请求吞吐量、请求耗费的时间、请求峰值甚至需要知道具体哪个服务的哪个方法花费了多少时间。网关作为请求的中转点是监控品牌的要塞。
本篇将针对Ocelot添加Metrics+InfluxDB+Grafana架构的监控。
1.下载安装InfluxDB和Grafana
在使用前需要先下载InfluxDB和Grafana这两个工具，下载安装方式大家可以先看下Edison Zhou大神的这篇：https://www.cnblogs.com/edisonchou/p/integrated_performance_monitoring_foundation.html，博主也是从这里学习的。
2.使用
安装好后，我们可以通过127.0.0.1:8083访问InfluxDB的可视化界面：
图中标出来的地方是InfluxDB提供给我们操作语句模板，通过Create Database创建一个名为“MIMetrics”的数据库，然后在右上角的设置按钮里我们可以设置用户名和密码，这里就不截图了，大家打开看一下就明白了。
在我们的Ocelot项目中通过NuGet引用下面几个包：
然后需要在Startup.cs启动类中添加如下配置：
public void ConfigureServices(IServiceCollection services) ???????{ ???????????#region 注册Metrics ???????????bool isOpenMetrics = Convert.ToBoolean(Configuration["AppMetrics:IsOpen"]); ???????????if (isOpenMetrics) ???????????{ ???????????????string database = Configuration["AppMetrics:DatabaseName"]; ???????????????string connStr = Configuration["AppMetrics:ConnectionString"]; ???????????????string app = Configuration["AppMetrics:App"]; ???????????????string env = Configuration["AppMetrics:Env"]; ???????????????string username = Configuration["AppMetrics:UserName"]; ???????????????string password = Configuration["AppMetrics:Password"]; ???????????????var uri = new Uri(connStr); ???????????????var metrics = AppMetrics.CreateDefaultBuilder().Configuration.Configure(options => ???????????????{ ???????????????????options.AddAppTag(app); ???????????????????options.AddEnvTag(env); ???????????????}).Report.ToInfluxDb(options => ???????????????{ ???????????????????options.InfluxDb.BaseUri = uri; ???????????????????options.InfluxDb.Database = database; ???????????????????options.InfluxDb.UserName = username; ???????????????????options.InfluxDb.Password = password; ???????????????????options.HttpPolicy.BackoffPeriod = TimeSpan.FromSeconds(30); ???????????????????options.HttpPolicy.FailuresBeforeBackoff = 5; ???????????????????options.HttpPolicy.Timeout = TimeSpan.FromSeconds(10); ???????????????????options.FlushInterval = TimeSpan.FromSeconds(5); ???????????????}).Build(); ???????????????services.AddMetrics(metrics); ???????????????services.AddMetricsReportScheduler(); ???????????????services.AddMetricsTrackingMiddleware(); ???????????????services.AddMetricsEndpoints(); ???????????????services.AddMetricsTrackingMiddleware(options => options.IgnoredHttpStatusCodes = new[] { 404 }); ???????????} ???????????#endregion ???????????services.AddOcelot(Configuration) ???????????????.AddConsul(); ???????????services.AddMvc(options => ???????????{ ???????????????options.Filters.Add<HttpGlobalExceptionFilter>(); //加入全局异常类 ???????????}); ???????} ???????// This method gets called by the runtime. Use this method to configure the HTTP request pipeline. ???????public void Configure(IApplicationBuilder app, IHostingEnvironment env, IApplicationLifetime lifetime, ILoggerFactory loggerFactory) ???????{ ???????????if (env.IsDevelopment()) ???????????{ ???????????????app.UseDeveloperExceptionPage(); ???????????} ???????????//loggerFactory.AddConsole(Configuration.GetSection("Logging")); ???????????bool isOpenMetrics = Convert.ToBoolean(Configuration["AppMetrics:IsOpen"]); ???????????if(isOpenMetrics) ???????????{ ???????????????app.UseMetricsAllMiddleware(); ???????????????app.UseMetricsAllEndpoints(); ???????????} ???????????app.UseOcelot(); ???????????app.UseMvc(); ???????}蓝色部分的代码是我们这次需要的，通过注册Metrics中间件的形式使用InfluxDB，然后下面是配置文件中需要添加的：
{ ?"Logging": { ???"IncludeScopes": false, ???"Debug": { ?????"LogLevel": { ???????"Default": "Warning" ?????} ???}, ???"Console": { ?????"LogLevel": { ???????"Default": "Warning" ?????} ???} ?}, ?"AppMetrics": { ???"IsOpen": true, ???"DatabaseName": "MIMetrics", ???"ConnectionString": "http://127.0.0.1:8086", ???"UserName": "admin", ???"Password": "tangjinghe", ???"App": "Ocelot", ???"Env": "Development" ?}}这样，配置就算完成了，然后重新运行起网关，发送几个请求后查看http://localhost:3000的Grafana的可视化界面：
.Net Core 商城微服务项目系列（三）：Ocelot网关接入Grafana监控
原文地址：https://www.cnblogs.com/weiBlog/p/9861311.html