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指标说明：

运行中的计划(runningCount)：
select count(1) from QRTZ_FIRED_TRIGGERS;

服务器数量(serverCount):
select count(1) from QRTZ_SCHEDULER_STATE where LAST_CHECKIN_TIME + CHECKIN_INTERVAL > unix_timestamp();

每台服务器最大并发数(threadCount):
org_quartz_threadPool_threadCount=10

totalCount = serverCount * threadCount
当 runningCount >= totalCount ，超载(waitingCount):

待执行(waitingCount)
select count(1) from QRTZ_TRIGGERS where NEXT_FIRE_TIME < unix_timestamp() and TRIGGER_STATE = 'WAITING';