Prometheus 普罗米修斯监控

周末在家无聊看新闻看到关于监控的东西拿来玩玩试一下感觉还蛮有意思特此记录一下

这里只介绍客户端的配置

1：首先在POM中添加依赖

<dependency>
            <groupId>io.prometheus</groupId>
            <artifactId>simpleclient</artifactId>
            <version>${prometheus.version}</version>
        </dependency>
        <!-- Hotspot JVM metrics-->
        <dependency>
            <groupId>io.prometheus</groupId>
            <artifactId>simpleclient_hotspot</artifactId>
            <version>${prometheus.version}</version>
        </dependency>
        <!-- Exposition servlet-->
        <dependency>
            <groupId>io.prometheus</groupId>
            <artifactId>simpleclient_servlet</artifactId>
            <version>${prometheus.version}</version>
        </dependency>
        <!-- Pushgateway exposition-->
        <dependency>
            <groupId>io.prometheus</groupId>
            <artifactId>simpleclient_pushgateway</artifactId>
            <version>${prometheus.version}</version>
        </dependency>
        <dependency>
            <groupId>io.prometheus</groupId>
            <artifactId>simpleclient_spring_web</artifactId>
            <version>${prometheus.version}</version>
        </dependency>

2:在web.xml文件里添加servlet拦截器

    <servlet>
        <servlet-name>PrometheusServlet</servlet-name>
        <servlet-class>io.prometheus.client.exporter.MetricsServlet</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>PrometheusServlet</servlet-name>
        <url-pattern>/metrics</url-pattern>
    </servlet-mapping>

web.xml

3:添加拦截器class

public class WebInterceptor extends HandlerInterceptorAdapter {

    private static Logger logger = Logger.getLogger(WebInterceptor.class);

    private static final String SYSTEM_ID= "BLOAN-GJJ";

    private static final String APP_ID= "gjj-ics-credit";

    private static final String TYPE = "java";


    private static final Histogram requestLatency = Histogram.build()
            .name("service_requests_latency_seconds")
            .help("Request latency in seconds.")
            .labelNames("systemId", "appId", "type", "name", "method").register();

    private ThreadLocal<Histogram.Timer> timerThreadLocal;

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        return super.preHandle(request, response, handler);
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        String name = this.getName(request, handler).toLowerCase();
        String method = request.getMethod().toUpperCase();
        timerThreadLocal = new ThreadLocal<>();
        timerThreadLocal.set(requestLatency.labels(SYSTEM_ID, APP_ID, TYPE, name, method).startTimer());
        super.postHandle(request, response, handler, modelAndView);
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        super.afterCompletion(request, response, handler, ex);
        if (timerThreadLocal.get() != null) {
            timerThreadLocal.get().observeDuration();
        }
    }

    @Override
    public void afterConcurrentHandlingStarted(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        super.afterConcurrentHandlingStarted(request, response, handler);
    }

    private String getName(HttpServletRequest request, Object handler) {
        String name = "";
        try {
            if (handler != null
                    && handler instanceof HandlerMethod) {
                HandlerMethod method = (HandlerMethod) handler;
                String className = ((HandlerMethod) handler).getBeanType().getName();
                name = className + "." + method.getMethod().getName();
            } else {
                name = request.getRequestURI();
            }
        } catch (Exception ex) {
            logger.error("getName", ex);
        } finally {
            return name;
        }
    }
}

View Code

4:配置初始化的类

@Component
public class PrometheusConfig {

    private static Logger logger = Logger.getLogger(PrometheusConfig.class);

    @PostConstruct
    public void initialize() {
        logger.info("prometheus init...");
        DefaultExports.initialize();
        logger.info("prometheus has been initialized...");
    }

}

PrometheusConfig.class

5:springmvc.xml中添加拦截器

        <mvc:interceptor>
            <bean class="com.pingan.credit.interceptor.WebInterceptor"/>
        </mvc:interceptor>

6:spring-application.xml 初始化初始化类中的方法

 <bean id="prometheusConfig" class="com.pingan.credit.service.PrometheusConfig" init-method="initialize" />

7:添加controller

@Controller
public class MetricsController {
    private CollectorRegistry registry;

    /**
     * Construct a MetricsServlet for the default registry.
     */
    public MetricsController() {
        this(CollectorRegistry.defaultRegistry);
    }

    /**
     * Construct a MetricsServlet for the given registry.
     */
    private MetricsController(CollectorRegistry registry) {
        this.registry = registry;
    }

    @RequestMapping(value="/metrics",method= RequestMethod.GET)
    public void metrics(final HttpServletRequest req,
                        final HttpServletResponse resp) throws ServletException,
            IOException {
        resp.setStatus(HttpServletResponse.SC_OK);
        resp.setContentType(TextFormat.CONTENT_TYPE_004);

        try (Writer writer = resp.getWriter()) {
            TextFormat.write004(writer,
                    registry.filteredMetricFamilySamples(parse(req)));
            writer.flush();
        }
    }

    private Set<String> parse(HttpServletRequest req) {
        String[] includedParam = req.getParameterValues("name[]");
        if (includedParam == null) {
            return Collections.emptySet();
        } else {
            return new HashSet<>(Arrays.asList(includedParam));
        }
    }
}

启动tomcat 以及你的project 然后进入localhost:8080/metrics就可以看到JVM的信息了

原文地址：https://www.cnblogs.com/showme1942/p/7457451.html