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>

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;

}

}

}

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...");

}
}

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