concourse_workers_tasks metric keeps reporting 0

[net-expertise]

Hi,
I am trying to monitor the number of active tasks on each worker but it always returns 0, even when a job is running.
Other metrics like concourse_workers_containers are just working fine.

Port-forwarding Prometheus service 9090, here's what I get:
`concourse_workers_tasks{platform="linux",worker="concourse-worker-656496fff4-wvb7v"} 0
concourse_workers_tasks{platform="linux",worker="concourse-worker-656496fff4-tf6c4"} 0

concourse_workers_containers{platform="linux",tags="",team="",worker="concourse-worker-656496fff4-tf6c4"} 29
concourse_workers_containers{platform="linux",tags="",team="",worker="concourse-worker-656496fff4-wvb7v"} 5
`
I did not open an issue since it seems to be working for others.
Am I missing something?

[pn-santos]

If I'm not mistaken for that metric to work concourse needs to be run with the limit-active-tasks-strategy enabled (don't remember if you also need to set max-active-tasks-per-worker too but I don't think so).

[net-expertise]

Indeed, I chained the limit-active-tasks to the volume-locality strategy with a high enough max tasks value
and I got this working
I'd like to use this metric to know when to scale down my deployments.

It'd be good to have this metric no matter the strategy IMHO
Thanks for the hint