Add way to specify namespaces

Signed-off-by: Michel Hollands <michel.hollands@grafana.com>

charts/meta-monitoring/templates/agent/_helpers-agent.tpl

@@ -0,0 +1,7 @@
+{{- define "agent.namespaces" -}}
+{{- $list := list }}
+{{- range .Values.namespacesToMonitor }}
+{{- $list = append $list (printf "\"%s\"" .) }}
+{{- end }}
+{{- join ", " $list }}
+{{- end }}

charts/meta-monitoring/templates/agent/config.yaml

@@ -0,0 +1,34 @@
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: agent-configmap
+  namespace: {{ .Release.Namespace }}
+data:
+  config.river: |
+    discovery.kubernetes "pods" {
+      role = "pod"
+      namespaces {
+        names = [ {{ include "agent.namespaces" . }} ]
+
+      }
+    }
+    loki.source.kubernetes "pods" {
+      targets    = discovery.kubernetes.pods.targets
+      forward_to = [loki.write.local.receiver]
+    }
+    loki.write "local" {
+      endpoint {
+        url = "http://{{- .Release.Name -}}-loki.{{- .Release.Namespace -}}.svc.cluster.local:3100/loki/api/v1/push"
+      }
+    }
+    prometheus.scrape "pods" {
+      targets    = discovery.kubernetes.pods.targets
+      forward_to = [prometheus.remote_write.default.receiver]
+    }
+    prometheus.remote_write "default" {
+      endpoint {
+        url = "http://{{- .Release.Name -}}-mimir-nginx.{{- .Release.Namespace -}}.svc:80/api/v1/push"
+      }
+    }
+
+