diff --git a/docker/swarm/service/monitoring/prometheus_alertmanager.yml b/docker/swarm/service/monitoring/prometheus_alertmanager.yml
index 99eb226..5d5f237 100644
--- a/docker/swarm/service/monitoring/prometheus_alertmanager.yml
+++ b/docker/swarm/service/monitoring/prometheus_alertmanager.yml
@@ -6,11 +6,12 @@
       service:
         prometheus_alertmanager:
           network: monitoring
-          replica: 2
+          replicas: 2
           environment:
             config_dir: /opt/alertmanager/config
             bind_port: ${prometheus:alertmanager:bind:port}
             bind_address: ${prometheus:alertmanager:bind:address}
+            discovery_domain: 'prometheus_alertmanager'
           restart:
             condition: any
           image: ${_param:docker_image_alertmanager}
diff --git a/docker/swarm/service/monitoring/prometheus_pushgateway.yml b/docker/swarm/service/monitoring/prometheus_pushgateway.yml
index 7ba37af..ad159b6 100644
--- a/docker/swarm/service/monitoring/prometheus_pushgateway.yml
+++ b/docker/swarm/service/monitoring/prometheus_pushgateway.yml
@@ -4,7 +4,7 @@
       service:
         prometheus_pushgateway:
           network: monitoring
-          replica: 2
+          replicas: 2
           restart:
             condition: any
           image: ${_param:docker_image_pushgateway}
diff --git a/docker/swarm/service/monitoring/prometheus_server.yml b/docker/swarm/service/monitoring/prometheus_server.yml
index 94207ca..37bb6d3 100644
--- a/docker/swarm/service/monitoring/prometheus_server.yml
+++ b/docker/swarm/service/monitoring/prometheus_server.yml
@@ -6,7 +6,7 @@
       service:
         prometheus_server:
           network: monitoring
-          replica: 1
+          replicas: 1
           environment:
             config_dir: /opt/prometheus/config
             bind_port: ${prometheus:server:bind:port}
@@ -17,6 +17,7 @@
             storage_local_memory_chunks: ${prometheus:server:storage:local:memory_chunks}
             storage_local_max_chunks_to_persist: ${prometheus:server:storage:local:max_chunks_to_persist}
             storage_local_num_fingerprint_mutexes: ${prometheus:server:storage:local:num_fingerprint_mutexes}
+            discovery_domain: 'prometheus_alertmanager'
           restart:
             condition: any
           image: ${_param:docker_image_prometheus}