Merge branch 'cluster-tag-external-label' into 'master'

fix cluster label section to external_label

Closes big-bang/product/packages/promtail#56

See merge request !4591

chart/templates/promtail/values.yaml

@@ -45,16 +45,15 @@ imagePullSecrets:
 
 {{- if .Values.loki.enabled }}
 config:
-  snippets:
-    extraRelabelConfigs: 
-      - action: replace
-        replacement: {{ $clusterName }}
-        target_label: cluster
   clients:
     {{- if eq .Values.loki.strategy "monolith" }}
     - url: http://logging-loki.logging.svc.cluster.local:3100/loki/api/v1/push
+      external_labels:
+        cluster: {{ $clusterName }}
     {{- else }}
     - url: http://logging-loki-write.logging.svc.cluster.local:3100/loki/api/v1/push
+      external_labels:
+        cluster: {{ $clusterName }}
     {{- end }}
 {{- end }}
 # If loki is disabled and promtail is not