Add enable_prometheus switch

group_vars/default/base.yml

@@ -28,7 +28,9 @@ debian_main_repository: http://ftp.debian.org/debian
 debian_security_repository: http://security.debian.org
 debian_pvc_repository: https://repo.parallelvirtualcluster.org/debian
 
-# Enable Prometheus metric reporting from PVC nodes (installs prometheus-node-exporter)
+# Enable Prometheus metric reporting from PVC nodes; installs prometheus-node-exporter and enables
+# (unauthenticated) metrics endpoints within the PVC API. Set "no" to turn off Prometheus metric
+# functionality.
 enable_prometheus_exporters: yes
 
 # Root user password

roles/pvc/defaults/main.yml

@@ -21,7 +21,7 @@ pvc_fence_successful_action: migrate    # What to do with VMs when a fence is su
 pvc_fence_failed_action: None           # What to do with VMs when a fence is failed (migrate, None) - migrate is DANGEROUS without pvc_suicide_intervals set to < pvc_fence_intervals
 pvc_migrate_target_selector: mem        # The selector to use for migrating VMs
 
-# Enable Prometheus exporters
+# Enable Prometheus exporters and corresponding API endpoints
 enable_prometheus_exporters: yes
 
 # Memory tuning

roles/pvc/templates/pvc/pvc.conf.j2

@@ -15,6 +15,7 @@ subsystem:
   enable_storage: yes
   enable_worker: yes
   enable_api: yes
+  enable_prometheus: {{ 'yes' if enable_prometheus_exporters else 'no' }}
 
 cluster:
   name: {{ cluster_group }}