diff --git a/data/common/kafka.yaml b/data/common/kafka.yaml
--- a/data/common/kafka.yaml
+++ b/data/common/kafka.yaml
@@ -68,6 +68,8 @@
     public_tls_port: 9093
     internal_tls_port: 9094
     public_listener_network: 128.93.166.0/26
+    # to label the prometheus exporter metrics
+    environment: production
   rocquencourt_staging:
     zookeeper::chroot: '/kafka/softwareheritage'
     zookeeper::servers:
@@ -89,5 +91,7 @@
     cluster_config_overrides:
       offsets.topic.replication.factor: 1 # this is mandatory with only one node
     public_listener_network: "%{alias('kafka::cluster::public_network')}"
+    # to label the prometheus exporter metrics
+    environment: staging
 
 
diff --git a/site-modules/profile/manifests/kafka/prometheus_consumer_group_exporter.pp b/site-modules/profile/manifests/kafka/prometheus_consumer_group_exporter.pp
--- a/site-modules/profile/manifests/kafka/prometheus_consumer_group_exporter.pp
+++ b/site-modules/profile/manifests/kafka/prometheus_consumer_group_exporter.pp
@@ -26,8 +26,9 @@
     $defaults_file = "${defaults_dir}/${cluster}"
     $service = "${pkg}@${cluster}"
 
-    $bootstrap_servers = $kafka_clusters[$cluster]["brokers"].keys.sort.join(',')
+    $bootstrap_servers = $kafka_clusters[$cluster]['brokers'].keys.sort.join(',')
     $port = $base_port + $index
+    $environment = $kafka_clusters[$cluster]['environment']
 
     file {$defaults_file:
       ensure  => present,
@@ -39,8 +40,8 @@
     }
 
     service {$service:
-      ensure => 'running',
-      enable => true,
+      ensure  => 'running',
+      enable  => true,
       require => [
         File[$defaults_file],
         Package[$pkg],
@@ -52,7 +53,8 @@
       job    => 'kafka-consumer-group',
       target => $target,
       labels => {
-        cluster => $cluster,
+        cluster     => $cluster,
+        environment => $environment
       }
     }
   }