diff --git a/ansible/group_vars/all.yml b/ansible/group_vars/all.yml
index 009b5881e2..06add8995d 100644
--- a/ansible/group_vars/all.yml
+++ b/ansible/group_vars/all.yml
@@ -1066,9 +1066,11 @@ enable_prometheus_ceph_mgr_exporter: "{{ enable_ceph | bool and enable_prometheu
 enable_prometheus_openstack_exporter: "{{ enable_prometheus | bool }}"
 enable_prometheus_elasticsearch_exporter: "{{ enable_prometheus | bool and enable_elasticsearch | bool }}"
 enable_prometheus_blackbox_exporter: "{{ enable_prometheus | bool }}"
+
 prometheus_alertmanager_user: "admin"
 prometheus_openstack_exporter_interval: "60s"
 prometheus_elasticsearch_exporter_interval: "60s"
+prometheus_cmdline_extras:
 
 ############
 # Vitrage
diff --git a/ansible/roles/prometheus/templates/prometheus-server.json.j2 b/ansible/roles/prometheus/templates/prometheus-server.json.j2
index 990185c7d5..3849cf9611 100644
--- a/ansible/roles/prometheus/templates/prometheus-server.json.j2
+++ b/ansible/roles/prometheus/templates/prometheus-server.json.j2
@@ -1,5 +1,5 @@
 {
-    "command": "/opt/prometheus/prometheus -config.file /etc/prometheus/prometheus.yml -web.listen-address {{ api_interface_address }}:{{ prometheus_port }} -web.external-url={{ internal_protocol }}://{{ kolla_internal_fqdn }}:{{ prometheus_port }} -log.format logger:stdout -storage.local.path /var/lib/prometheus",
+    "command": "/opt/prometheus/prometheus -config.file /etc/prometheus/prometheus.yml -web.listen-address {{ api_interface_address }}:{{ prometheus_port }} -web.external-url={{ internal_protocol }}://{{ kolla_internal_fqdn }}:{{ prometheus_port }} -log.format logger:stdout -storage.local.path /var/lib/prometheus{% if prometheus_cmdline_extras %} {{ prometheus_cmdline_extras }}{% endif %}",
     "config_files": [
         {
             "source": "{{ container_config_directory }}/prometheus.yml",
diff --git a/etc/kolla/globals.yml b/etc/kolla/globals.yml
index f35b6f76f4..07c68061b6 100644
--- a/etc/kolla/globals.yml
+++ b/etc/kolla/globals.yml
@@ -598,6 +598,9 @@
 #enable_prometheus_elasticsearch_exporter: "{{ enable_prometheus | bool and enable_elasticsearch | bool }}"
 #enable_prometheus_blackbox_exporter: "{{ enable_prometheus | bool }}"
 
+# List of extra parameters passed to prometheus. You can add as many to the list.
+#prometheus_cmdline_extras:
+
 #########
 # Freezer
 #########
diff --git a/releasenotes/notes/prometheus-cmdline-extras-2e680c8697c1a308.yaml b/releasenotes/notes/prometheus-cmdline-extras-2e680c8697c1a308.yaml
new file mode 100644
index 0000000000..51819d8121
--- /dev/null
+++ b/releasenotes/notes/prometheus-cmdline-extras-2e680c8697c1a308.yaml
@@ -0,0 +1,3 @@
+---
+features:
+  - Adds support for passing extra options to Prometheus.