Helm chart: expose worker_threads configuration

[Kirill888]

I would like to configure number of worker threads separately from worker.cores.{request|limit}.

But generated code here:

dask-gateway/resources/helm/dask-gateway/templates/gateway/configmap.yaml

Lines 55 to 75 in c81c71f

	# Forward dask cluster configuration
	for field, prop_name in [
	# Scheduler config
	("scheduler_cores", "scheduler.cores.request"),
	("scheduler_cores_limit", "scheduler.cores.limit"),
	("scheduler_memory", "scheduler.memory.request"),
	("scheduler_memory_limit", "scheduler.memory.limit"),
	("scheduler_extra_container_config", "scheduler.extraContainerConfig"),
	("scheduler_extra_pod_config", "scheduler.extraPodConfig"),
	# Worker config
	("worker_cores", "worker.cores.request"),
	("worker_cores_limit", "worker.cores.limit"),
	("worker_memory", "worker.memory.request"),
	("worker_memory_limit", "worker.memory.limit"),
	("worker_extra_container_config", "worker.extraContainerConfig"),
	("worker_extra_pod_config", "worker.extraPodConfig"),
	# Additional fields
	("image_pull_policy", "image.pullPolicy"),
	("environment", "environment"),
	("namespace", "namespace"),
	]:

does not expose worker_threads configuration option. I think this should be easy to add?

I'd like to run 8 threads on an 8 core node, but I need to request fewer cores from k8s to fit pod into the node, with the current helm we end up with 7 threads worker on an 8 core instance and I don't think k8s needs one whole core for service processes.

[aktech]

I believe this was added in #413