大众点评CAT,我是怎么增加HEARTBEAT心跳指标的

步骤一：

修改工程cat-client的

com.dianping.cat.status.StatusInfoCollector.visitStatus方法

  /**   * 自定义指标   * @param status   */  private void addCustomItems(StatusInfo status) {    ServerInfo serverInfo = ServerInfoService.instance().calcServerInfo(); //生成了CPU、内存数据    CustomInfo cpuRate = new CustomInfo();    cpuRate.setKey("cpuRate");   //自定义指标的KEY    cpuRate.setValue(serverInfo.getCpuPercent() + ""); //自定义指标的值     status.addCustomInfo(cpuRate); //在statusInfo        CustomInfo memoryRate = new CustomInfo();      memoryRate.setKey("memoryRate");    memoryRate.setValue(serverInfo.getMemoryPercent() + "");    status.addCustomInfo(memoryRate);  }

这样客户端在发心跳的时候，就会把cpuRate、memoryRate发送到服务端了。

步骤二： 

修改工程cat-consumer的

com.dianping.cat.consumer.heartbeat.HeartbeatAnalyzer.

translateHeartbeat()方法

  /**   * 自定义指标   * @param info   */  private void addCustomItems(StatusInfo info) {    Extension customExtension = info.findOrCreateExtension("ServerInfo"); //这个是指标的类型        CustomInfo cpuRate = info.getCustomInfos().get("cpuRate");    customExtension.findOrCreateExtensionDetail(cpuRate.getKey())        .setValue(ServerInfoUtils.str2Double(cpuRate.getValue()));        CustomInfo memoryRate = info.getCustomInfos().get("memoryRate");    customExtension.findOrCreateExtensionDetail(memoryRate.getKey())    .setValue(ServerInfoUtils.str2Double(memoryRate.getValue()));      }

步骤三：

修改工程cat-consumer

com.dianping.cat.consumer.heartbeat.HeartbeatReportMerger

.mergePeriod()方法

  @Override  protected void mergePeriod(Period old, Period period) {    old.setCatMessageOverflow(period.getCatMessageOverflow());    old.setCatMessageProduced(period.getCatMessageProduced());    old.setCatMessageSize(period.getCatMessageSize());    old.setCatThreadCount(period.getCatThreadCount());    old.setDaemonCount(period.getDaemonCount());    old.setHeapUsage(period.getHeapUsage());    old.setHttpThreadCount(period.getHttpThreadCount());    old.setMemoryFree(period.getMemoryFree());    old.setMinute(period.getMinute());    old.setNewGcCount(period.getNewGcCount());    old.setNoneHeapUsage(period.getNoneHeapUsage());    old.setOldGcCount(period.getOldGcCount());    old.setPigeonThreadCount(period.getPigeonThreadCount());    old.setSystemLoadAverage(period.getSystemLoadAverage());    old.setThreadCount(period.getThreadCount());    old.setTotalStartedCount(period.getTotalStartedCount());    //新增的两个指标    old.setDynamicAttribute("cpuRate", period.getDynamicAttribute("cpuRate"));    old.setDynamicAttribute("memoryRate", period.getDynamicAttribute("memoryRate"));  }

步骤四：工程cat-home

修改内部类com.dianping.cat.report.page.heartbeat.service

.HeartbeatReportService.HeartbeatConvertor的visitPeriod方法

    /**     * 自定义指标     * @param period     */    private void addCustomItems(Period period) {      Extension customExtension = period.findOrCreateExtension("ServerInfo");                  customExtension.findOrCreateDetail("cpuRate")          .setValue(ServerInfoUtils.str2Double(period.getDynamicAttribute("cpuRate")));                        customExtension.findOrCreateDetail("memoryRate")      .setValue(ServerInfoUtils.str2Double(period.getDynamicAttribute("memoryRate")));          }

至此，修改代码部分已经完成。

步骤五：配置[应用监控配置-心跳报表展示]增加一个group

   <group id="ServerInfo" order="1">      <metric id="cpuRate" unit="1" delta="false" order="1" lable="%" alert="true"/>      <metric id="memoryRate" unit="1" delta="false" order="2" lable="%" alert="true"/>   </group>

自定义指标就成功了，可以在心跳报表里看到效果。

自定义的指标，也可以配置告警，这样就能在CPU异常的时候发送告警，非常实用。具体怎么配置告警，可以看这篇文章

大众点评CAT告警配置手把手教学

源码时刻，公众号：源码时刻大众点评CAT告警配置手把手教学

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