Add skeleton for vmalert and alertmanager (without configuration)

pica-metrologie/docker-compose.yml

@@ -52,6 +52,7 @@ services:
       - metrics
     restart: unless-stopped
 
+  # Stores all metrics in a TSDB compatible with PromQL queries
   vmagent:
     image: victoriametrics/vmagent:v1.63.0
     container_name: vmagent
@@ -67,3 +68,41 @@ services:
     networks:
       - metrics
     restart: unless-stopped
+
+  # Fires alerts based on custom rules (like disk > 80% etc)
+  vmalert:
+    image: victoriametrics/vmalert:v1.62.0
+    container_name: vmalert
+    command:
+      - "-rule=/config/vmalert-rules.yml"
+      # Where to read metrics
+      - "-datasource.url=http://victoria-metrics:8428"
+      # Where to write and read alert states, to keep
+      # state during restart, as vmagent stores states in memory
+      - "-remoteWrite.url=http://victoria-metrics:8428"
+      - "-remoteRead.url=http://victoriametrics:8428"
+      # Where to send alert when they must be triggered
+      - "-notifier.url=http://alertmanager:9093"
+      # HTTP server for vmagent's own metrics
+      - "-httpListenAddr=:8880"
+      # Evaluate rules every 10 minutes
+      - "-evaluationInterval=10m"
+      - "-loggerOutput=stdout"
+    volumes:
+      - ./vmalert-rules.yml:/config/vmalert-rules.yml
+    networks:
+      - metrics
+    restart: unless-stopped
+
+  # Receives alerts and decides what to do, e.g. send a mail or a Mattermost message
+  # Takes care of deduplication etc
+  alertmanager:
+    image: prom/alertmanager:v0.22.2
+    container_name: alertmanager
+    command:
+      - "--config.file=/config/alertmanager.yml"
+    volumes:
+      - ./alertmanager.yml:/config/alertmanager.yml
+    networks:
+      - metrics
+    restart: unless-stopped