业务系统的Prometheus实践示例详解

@Component
public class ApolloRefreshConfig {
    @Resource
    private RefreshScope refreshScope;
    @Resource
    private ApplicationContext applicationContext;
    @Resource
    private ThreadPoolExecutor executorService;
    @ApolloConfigChangeListener
    public void onChange(ConfigChangeEvent changeEvent) {
        applicationContext.publishEvent(new EnvironmentChangeEvent(changeEvent.changedKeys()));
        refreshScope.refreshAll();
        // 刷新变量
        asyncRequestTaskConfigChange(changeEvent.changedKeys());
    }
    private void asyncRequestTaskConfigChange(Set<String> changedKeys) {
        //apollo 变更的是线程池变量
        if (changedKeys.contains(EvaluationProcessAsyncRequestTaskConfig.ASYNC_REQUEST_TASK_CHANGE_FLAG_KEY)) {
            // 核心线程数
            Integer corePoolSizeOld = executorService.getCorePoolSize();
            if (!corePoolSize.equals(corePoolSizeOld)) {
                executorService.setCorePoolSize(corePoolSize);
            }
            // 最大线程数
            Integer maximumPoolSizeOld = executorService.getMaximumPoolSize();
            if (!maximumPoolSize.equals(maximumPoolSizeOld)) {
                executorService.setMaximumPoolSize(maximumPoolSize);
            }
            // 修改线程空闲时间
            Long keepAliveTimeOld = executorService.getKeepAliveTime(TimeUnit.MINUTES);
            if (!keepAliveTime.equals(keepAliveTimeOld)) {
                executorService.setKeepAliveTime(keepAliveTime, TimeUnit.MINUTES);
            }
        }
    }
}

<dependency>
    <groupId>cn.gov.zcy.boot</groupId>
    <artifactId>spring-boot-starter-actuator</artifactId>
</dependency

@Component
public class MonitorFactory {
    @Resource
    private MeterRegistry meterRegistry;
    @Resource
    private ThreadPoolExecutor threadPoolExecutor;
    private ThreadPoolSizeMonitor threadPoolSizeMonitor = new ThreadPoolSizeMonitor(threadPoolExecutor);
    class ThreadPoolSizeMonitor implements ToDoubleFunction {
        private ThreadPoolExecutor executor;
        //计数
        private AtomicDouble monitor = new AtomicDouble(0);
        public Object getMonitor() {
            return monitor;
        }
        public ThreadPoolSizeMonitor(ThreadPoolExecutor executor) {
            this.executor = executor;
        }
        @Override
        public double applyAsDouble(Object o) {
            monitor.set(executor.getPoolSize());
            return monitor.get();
        }
    }
    //上报指标，初始化时注册指标
    @PostConstruct
    public void monitorThreadPool() {
        // 当前存活线程数
        Gauge.builder("ReportBatchSignPool_poolSizeMonitor", threadPoolSizeMonitor.getMonitor(), threadPoolSizeMonitor).register(meterRegistry);
        // 当前活跃（忙碌）线程数
        // 核心存活线程数
        // 提交的任务数
        // 执行完毕的任务数
        // 任务队列积压监控
    }
    //1 分钟更新一次指标数据
    @Scheduled(cron = "0 0/1 * * * ?")
    public void publishWatcher() {
        threadPoolSizeMonitor.applyAsDouble(null);
    }
}