前言
前一段时间使用SpringBoot创建了一个webhook项目,由于近期项目中也使用了不少SpringBoot相关的项目,趁着周末,配置一下使用prometheus监控微服务Springboot。
项目配置
引入坐标
<!-- Exposition spring_boot --><dependency> <groupId>io.prometheus</groupId> <artifactId>simpleclient_spring_boot</artifactId> <version>0.1.0</version></dependency><!-- Hotspot JVM metrics --><dependency> <groupId>io.prometheus</groupId> <artifactId>simpleclient_hotspot</artifactId> <version>0.1.0</version></dependency><!-- Exposition servlet --><dependency> <groupId>io.prometheus</groupId> <artifactId>simpleclient_servlet</artifactId> <version>0.1.0</version></dependency>
配置Application
@SpringBootApplication@EnablePrometheusEndpoint@EnableSpringBootMetricsCollectorpublic class Application { private static final Logger logger = LoggerFactory.getLogger(Application.class); public static void main(String[] args) throws InterruptedException { SpringApplication.run(Application.class, args); logger.info("项目启动 "); } }
配置MonitoringConfig
@Configurationclass MonitoringConfig { @Bean SpringBootMetricsCollector springBootMetricsCollector(Collection<PublicMetrics> publicMetrics) { SpringBootMetricsCollector springBootMetricsCollector = new SpringBootMetricsCollector(publicMetrics); springBootMetricsCollector.register(); return springBootMetricsCollector; } @Bean ServletRegistrationBean servletRegistrationBean() { DefaultExports.initialize(); return new ServletRegistrationBean(new MetricsServlet(), "/prometheus"); } }
配置Interceptor
RequestCounterInterceptor(计数):
public class RequestCounterInterceptor extends HandlerInterceptorAdapter { // @formatter:off // Note (1) private static final Counter requestTotal = Counter.build() .name("http_requests_total") .labelNames("method", "handler", "status") .help("Http Request Total").register(); // @formatter:on @Override public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception e) throws Exception { // Update counters String handlerLabel = handler.toString(); // get short form of handler method name if (handler instanceof HandlerMethod) { Method method = ((HandlerMethod) handler).getMethod(); handlerLabel = method.getDeclaringClass().getSimpleName() + "." + method.getName(); } // Note (2) requestTotal.labels(request.getMethod(), handlerLabel, Integer.toString(response.getStatus())).inc(); } }
RequestTimingInterceptor(统计请求时间):
package com.itstyle.webhook.interceptor;import java.lang.reflect.Method;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import io.prometheus.client.Summary;import org.springframework.web.method.HandlerMethod;import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;public class RequestTimingInterceptor extends HandlerInterceptorAdapter { private static final String REQ_PARAM_TIMING = "timing"; // @formatter:off // Note (1) private static final Summary responseTimeInMs = Summary .build() .name("http_response_time_milliseconds") .labelNames("method", "handler", "status") .help("Request completed time in milliseconds") .register(); // @formatter:on @Override public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { // Note (2) request.setAttribute(REQ_PARAM_TIMING, System.currentTimeMillis()); return true; } @Override public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)throws Exception { Long timingAttr = (Long) request.getAttribute(REQ_PARAM_TIMING); long completedTime = System.currentTimeMillis() - timingAttr; String handlerLabel = handler.toString(); // get short form of handler method name if (handler instanceof HandlerMethod) { Method method = ((HandlerMethod) handler).getMethod(); handlerLabel = method.getDeclaringClass().getSimpleName() + "." + method.getName(); } // Note (3) responseTimeInMs.labels(request.getMethod(), handlerLabel, Integer.toString(response.getStatus())).observe(completedTime); } }
配置Controller
主要是为了测试拦截器的效果
@RestControllerpublic class HomeController { private static final Logger logger = LoggerFactory.getLogger(HomeController.class); @RequestMapping("/endpointA") public void handlerA() throws InterruptedException { logger.info("/endpointA"); Thread.sleep(RandomUtils.nextLong(0, 100)); } @RequestMapping("/endpointB") public void handlerB() throws InterruptedException { logger.info("/endpointB"); Thread.sleep(RandomUtils.nextLong(0, 100)); } }
以上都配置完成后启动项目即可。
配置Prometheus
vi prometheus.yml
- job_name: webhook metrics_path: '/prometheus' static_configs: - targets: ['localhost:8080'] labels: instance: webhook
保存后重新启动Prometheus即可。
访问http://ip/targets 服务State 为up说明配置成功,查阅很多教程都说需要配置 spring.metrics.servo.enabled=false,否则在prometheus的控制台的targets页签里,会一直显示此endpoint为down状态,然貌似并没有配置也是ok的。
访问http://ip/graph 测试一下效果
配置Grafana
如图所示:
参考链接
https://blog.52itstyle.com/archives/1984/
https://blog.52itstyle.com/archives/2084/
https://raymondhlee.wordpress.com/2016/09/24/monitoring-spring-boot-applications-with-prometheus/