Add ntfy alert delivery for monitoring

monitoring/docker-compose.yml

@@ -19,10 +19,49 @@ services:
     security_opt:
       - no-new-privileges:true
     depends_on:
+      - alertmanager
       - blackbox-exporter
       - node-exporter
       - cadvisor
 
+  alertmanager:
+    image: prom/alertmanager:v0.28.1
+    container_name: monitoring-alertmanager
+    restart: unless-stopped
+    command:
+      - --config.file=/etc/alertmanager/alertmanager.yml
+      - --storage.path=/alertmanager
+    volumes:
+      - ./alertmanager/alertmanager.yml:/etc/alertmanager/alertmanager.yml:ro
+      - alertmanager_data:/alertmanager
+    networks:
+      - monitoring_net
+    expose:
+      - "9093"
+    security_opt:
+      - no-new-privileges:true
+
+  alertmanager-ntfy-bridge:
+    image: python:3.13-alpine
+    container_name: monitoring-alertmanager-ntfy-bridge
+    restart: unless-stopped
+    dns:
+      - 1.1.1.1
+      - 8.8.8.8
+    environment:
+      NTFY_URL: https://ntfy.kaleschke.info/homelab-alerts
+    command:
+      - python
+      - /app/bridge.py
+    volumes:
+      - ./alertmanager-ntfy-bridge/bridge.py:/app/bridge.py:ro
+    networks:
+      - monitoring_net
+    expose:
+      - "8080"
+    security_opt:
+      - no-new-privileges:true
+
   blackbox-exporter:
     image: prom/blackbox-exporter:v0.27.0
     container_name: monitoring-blackbox-exporter
@@ -311,6 +350,7 @@ networks:
 
 volumes:
   prometheus_data:
+  alertmanager_data:
   loki_data:
   promtail_positions:
   grafana_data: