diff --git a/docs/values.md b/docs/values.md
index 7e265bd7afc2b879747146c2b4416f027c651245..3d7038258468e7b687bfe5cb53917a14dd9f28cd 100644
--- a/docs/values.md
+++ b/docs/values.md
@@ -56,7 +56,7 @@ This file contains the markdown version of the default values that this chart ta
 | metrics.prometheus.operator | object | Resources configuration. See `values.yaml`. | specific configuration for the prometheus operator |
 | metrics.prometheus.operator.nodeSelector | hash | `"nil"` | prometheus operator node selectors |
 | metrics.prometheus.server.nodeSelector | hash | `"nil"` | prometheus server node selectors |
-| metrics.prometheus.server.extraLabelsForMetrics | list | `[]` | set of static labels and values to add to all the metrics gathered by the in-cluster prometheus when exported to central monitoring |
+| metrics.prometheus.server.extraLabelsForMetrics | hash | `{}` | set of static labels and values to add to all the metrics gathered by the in-cluster prometheus when exported to central monitoring |
 | metrics.prometheus.server.remoteWrite | object | `{}` | remote write prometheus configuration |
 | metrics.prometheus.server.resources.limits.cpu | string | `"500m"` |  |
 | metrics.prometheus.server.resources.limits.memory | string | `"5Gi"` |  |
@@ -72,4 +72,4 @@ This file contains the markdown version of the default values that this chart ta
 | tenant.name | string | `"nil"` | username used for authenitcating in the MONIT infrastructure |
 | tenant.password | string | `"nil"` | password (plain) used for authenitcating in the MONIT infrastructure |
 
-----------------------------------------------
\ No newline at end of file
+----------------------------------------------
diff --git a/templates/prometheus/prometheus.yaml b/templates/prometheus/prometheus.yaml
index 9bc348b2f61f799beeabdacfa70009f47653af67..83cd97f384fbe058216eec94ed18653b17f18549 100644
--- a/templates/prometheus/prometheus.yaml
+++ b/templates/prometheus/prometheus.yaml
@@ -12,6 +12,9 @@ spec:
   retention: {{ .Values.metrics.prometheus.server.retention }}
   externalLabels:
     k8s_cluster_name: {{ .Values.kubernetes.clusterName }}
+    {{- with .Values.metrics.prometheus.server.extraLabelsForMetrics }}
+    {{- toYaml . | nindent 4 }}
+    {{- end }}
   nodeSelector:
     {{- .Values.metrics.prometheus.server.nodeSelector | default .Values.metrics.defaultNodeSelector | toYaml | nindent 4 }}
   serviceAccountName: it-monit-metrics-collector-prometheus
diff --git a/values.yaml b/values.yaml
index e9dc25b2451962da8cb915f2627bcf569631b32b..a7d05c06cb484f7b0250bf65cef8d5311f191abf 100644
--- a/values.yaml
+++ b/values.yaml
@@ -88,7 +88,7 @@ metrics:
       # -- interval during which local cluster prometheus will store metrics
       retention: "24h"
       # -- set of static labels and values to add to all the metrics gathered by the in-cluster prometheus when exported to central monitoring
-      extraLabelsForMetrics: []
+      extraLabelsForMetrics: {}
       # -- remote write prometheus configuration
       remoteWrite: {}
         # endpoint: "https://monit-prom-mom.cern.ch:9090/api/v1/write"