Add smartctl-exporter to copenhagen-a and Prometheus scrape

- Add smartctl-exporter to copenhagen-a docker_services
- Add copenhagen-a as a Prometheus smartmontools scrape target
- Update compose file comment to reflect multi-host usage

Closes PESO-128

ansible/inventory/host_vars/copenhagen-a.yml

@@ -15,6 +15,7 @@ systemd_services:
 # Docker Compose services deployed by docker_services role
 docker_services:
   - minecraft
+  - smartctl-exporter
 
 # MaNGOS database backend — managed by apt, not Ansible
 system_packages_services:

ansible/services/prometheus/prometheus.yml

@@ -53,6 +53,10 @@ scrape_configs:
         labels:
           location: london
           server: london-b
+      - targets: ["100.89.206.60:9633"]
+        labels:
+          location: copenhagen
+          server: copenhagen-a
 
   - job_name: "plex"
     static_configs:

ansible/services/smartctl-exporter/docker-compose.yml

@@ -1,7 +1,7 @@
 ---
 # smartctl-exporter - SMART disk metrics for Prometheus
-# Host: london-b (100.84.65.101)
+# Hosts: london-b (100.84.65.101), copenhagen-a (100.89.206.60)
-# Access: http://london-b:9633/metrics
+# Access: http://<host>:9633/metrics
 
 services:
   smartctl-exporter: