OItsMAK opened a new issue #7778: How can we do health checks on Druid 
processes?
URL: https://github.com/apache/incubator-druid/issues/7778
 
 
   We use Druid and would like a way to know when its processes have started up 
successfully. 
   Something like the `ruok` check on zookeeper (explained 
[here](https://zookeeper.apache.org/doc/r3.1.2/zookeeperAdmin.html), example 
[here](https://stackoverflow.com/a/55609944)).
   
   The point of this is problematic starts and/or rolling updates of the Druid 
Docker containers, where HealthChecks come in handy.
   
   Currently, the methods that come to my mind are simple `min_healthy_time` 
waits,
   Or checking the announcements of Druid nodes in `Zookeeper`, which is a 
weird method since it includes setting up some sort of monitoring on registered 
`ZK` nodes, or contacting `ZK` directly.

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