[prometheus-redis-exporter] Allow setting namespace for redis-exporter deployment

[nikochiko]

Is your feature request related to a problem ?

prometheus-redis-exporter's deployment has no way to set the namespace (

helm-charts/charts/prometheus-redis-exporter/templates/deployment.yaml

Lines 3 to 7 in 25238a6

	metadata:
	name: {{ template "prometheus-redis-exporter.fullname" . }}
	labels:
	{{ include "prometheus-redis-exporter.labels" . | indent 4 }}
	annotations:

).

The related service monitor's namespace can be set with Values.serviceMonitor.namespace but not for the deployment.

This is a problem because my Helm chart is installed with a monitoring namespace, but I want the deployment for redis-exporter to be created in the same namespace as the Redis pods -- for sharing secrets.

Describe the solution you'd like.

The redis-exporter deployment should respect Values.namespace (a key that doesn't exist yet).

It would also make sense for this key to be the default for the related serviceMonitor unless Values.serviceMonitor.namespace is explicitly provided.

Describe alternatives you've considered.

NONE

Additional context.

I can contribute the needed change for this.