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I think taskContStatsMonitor is an overlord thing

Yes,

TaskCountStatsMonitor

works only with Overlord as it is bound with a concrete impl only in overlord. To use it correctly, you must specify this monitor in the overlord

runtime.properties

(and not

common.runtime.properties

or that of any other service). @İbrahim Ercan, does your use case require some task count at the middle manager level?

Since doc does not say anything about it, I thought I need to add it to middlemanagers since they are task related. We are running coordinator as overlord. I've added it on coordinator config. I didn't get any error but still I'm not able to get task metrics. I'm using prometheus emitter and see below warnings on metric page.

# HELP druid_task_waiting_count Number of current waiting tasks. This metric is only available if the TaskCountStatsMonitor module is included.
# TYPE druid_task_waiting_count counter

👍 . Yeah, I think the warning can be a little misleading when the module is already included.