(WIP) monitoring: attempt at container alerts

roles/alpina/templates/services/monitoring/docker-compose.yml.j2

@@ -60,12 +60,15 @@ services:
   prometheus:
     image: prom/prometheus:latest
     container_name: prometheus
+    labels:
+      - {{ helpers.traefik_labels('prom', port='9090') | indent(6) }}
     restart: unless-stopped
     # Needed to make config files readable (not anymore, TODO: remove)
     user: "{{ remote_uid }}"
     command:
       - --config.file=/etc/prometheus/prometheus.yml
       - --storage.tsdb.retention.time=30d
+      - --web.external-url=https://prom.{{ domain }}/
     volumes:
       - ./prometheus_config:/etc/prometheus:ro
       - {{ base_volume_path }}/monitoring/prometheus_configs:/etc/prometheus/extra:ro
@@ -74,12 +77,15 @@ services:
   alertmanager:
     image: prom/alertmanager:latest
     container_name: alertmanager
+    labels:
+      - {{ helpers.traefik_labels('alert', port='9093') | indent(6) }}
     restart: unless-stopped
     command:
       - --config.file=/etc/alertmanager/alertmanager.yml
+      - --web.external-url=https://alert.{{ domain }}/
     volumes:
       - ./alertmanager_config:/etc/alertmanager:ro
-    # TODO: add volume for alertmanager data
+      - {{ base_volume_path }}/monitoring/alertmanager:/alertmanager
 
   node-exporter:
     image: prom/node-exporter:latest

roles/alpina/templates/services/monitoring/prometheus_config/container.alerts.yml

@@ -0,0 +1,23 @@
+groups:
+  - name: qbit-low-traffic
+    interval: 1m
+    rules:
+      - alert: QbitLowTraffic
+        expr: |
+          rate(container_network_transmit_bytes_total{name=~"gluetun"}[1m]) < 1024
+        for: 2m
+        labels:
+          severity: warning
+        annotations:
+          title: 'Low traffic on qBit'
+          description: |
+            The traffic on qBittorrent is lower than 1KiB/s for 2 minutes.
+
+            Last value was x bytes/s.
+
+            [Grafana Dashboard](https://grafana.{{ domain }}/d/containers?orgId=1)
+            [View in Grafana](https://grafana.{{ domain }}/d/containers?orgId=1&viewPanel=3)
+
+          __dashboard__uid: 'containers'
+          __orgId__: 1
+          __panelId__: 3

roles/alpina/templates/services/monitoring/prometheus_config/prometheus.yml.j2

@@ -43,7 +43,7 @@ scrape_configs:
           - 'demo.promlabs.com:10002'
 
 rule_files:
-  - "/etc/prometheus/demo-alerts.yml"
+  - "/etc/prometheus/container.alerts.yml"
   - "/etc/prometheus/extra/rules/*.yml"
   - "/etc/prometheus/extra/rules/*.json"