leventov opened a new issue #9283: MonitorScheduler is prone to clock drift URL: https://github.com/apache/druid/issues/9283 [`MonitorScheduler`](https://github.com/apache/druid/blob/6ee0afa8e5cdfd36409ef78b236bba085c40c892/core/src/main/java/org/apache/druid/java/util/metrics/MonitorScheduler.java) emits metrics periodically using a `ScheduledExecutorService`, provided `ScheduledThreadPoolExecutor`, which is [prone to unbounded clock drift](https://medium.com/@leventov/cronscheduler-a-reliable-java-scheduler-for-external-interactions-cb7ce4a4f2cd). It's impossible to say whether any of the Monitors intricate time, or any of the emitters imply time of the sendings, so to reduce the chance of getting unreliable metrics in case of clock drift, I suggest to use [CronScheduler](https://github.com/TimeAndSpaceIO/CronScheduler).
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