If we have separate instance groups, we can see the status with the API output below.
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https://<CONTROLLER_URL>/api/v2/instance_groups/<ID>/jobs/
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Note: Please note that the status of running Jobs will not be listed and if you want to know "Currently Running Jobs you can use the API below.
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https://<CONTROLLER_URL>/api/v2/unified_jobs/?status=running
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However, the above API output can only list the jobs running on specific instance group.

We need additional function to check which job occupied most resources on specific execution node for monitoring our resource.