feat: add optional service monitor namespace (kubernetes-sigs#2609)

* feat: add optional service monitor namespace

* namespace to None

Author: shalomy-cyera

helm/aws-load-balancer-controller/README.md

@@ -166,7 +166,7 @@ The following tables lists the configurable parameters of the chart and their de
 The default values set by the application itself can be confirmed [here](https://kubernetes-sigs.github.io/aws-load-balancer-controller/guide/controller/configurations/).
 
 | Parameter                                      | Description                                                                                              | Default                                                                            |
-| ---------------------------------------------- | -------------------------------------------------------------------------------------------------------- | ---------------------------------------------------------------------------------- |
+|------------------------------------------------| -------------------------------------------------------------------------------------------------------- | ---------------------------------------------------------------------------------- |
 | `image.repository`                             | image repository                                                                                         | `602401143452.dkr.ecr.us-west-2.amazonaws.com/amazon/aws-load-balancer-controller` |
 | `image.tag`                                    | image tag                                                                                                | `<VERSION>`                                                                        |
 | `image.pullPolicy`                             | image pull policy                                                                                        | `IfNotPresent`                                                                     |
@@ -238,4 +238,5 @@ The default values set by the application itself can be confirmed [here](https:/
 | `serviceMonitor.enabled`                       | Specifies whether a service monitor should be created, requires the ServiceMonitor CRD to be installed   | `false`                                                                            |
 | `serviceMonitor.additionalLabels`              | Labels to add to the service account                                                                     | `{}`                                                                               |
 | `serviceMonitor.interval`                      | Prometheus scrape interval                                                                               | `1m`                                                                               |
+| `serviceMonitor.namespace`                     | Namespace in which Prometheus is running                                                                 | None                                                                               |
 | `clusterSecretsPermissions.allowAllSecrets`    | If `true`, controller has access to all secrets in the cluster.                                          | `false`                                                                            |

helm/aws-load-balancer-controller/templates/servicemonitor.yaml

@@ -3,6 +3,11 @@ apiVersion: monitoring.coreos.com/v1
 kind: ServiceMonitor
 metadata:
   name: {{ include "aws-load-balancer-controller.fullname" . }}
+  {{- if .Values.serviceMonitor.namespace }}
+  namespace: {{ .Values.serviceMonitor.namespace }}
+  {{- else }}
+  namespace: {{ .Release.Namespace | quote }}
+  {{- end }}
   labels:
     {{- include "aws-load-balancer-controller.labels" . | nindent 4 }}
     {{- with .Values.serviceMonitor.additionalLabels }}
@@ -27,4 +32,4 @@ spec:
       {{- with .Values.serviceMonitor.interval }}
       interval: {{ . }}
       {{- end }}
-{{- end -}}
+{{- end -}}

helm/aws-load-balancer-controller/values.yaml

@@ -287,6 +287,8 @@ serviceMonitor:
   additionalLabels: {}
   # Prometheus scrape interval
   interval: 1m
+  # Namespace to create the service monitor in
+  namespace:
 
 # clusterSecretsPermissions lets you configure RBAC permissions for secret resources
 # Access to secrets resource is required only if you use the OIDC feature, and instead of