Add prometheus

prometheus/.gitignore

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+/data/*
+!/data/config

prometheus/data/config/prometheus.yaml

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+global:
+    scrape_interval: 10s
+
+scrape_configs:
+    - job_name: "node_exporter"
+      scrape_interval: 2s
+      static_configs:
+          - targets: ["node_exporter:9100"]
+
+    - job_name: "cadvisor"
+      scrape_interval: 2s
+      static_configs:
+          - targets: ["cadvisor:8080"]
+
+    - job_name: caddy
+      scrape_interval: 2s
+      static_configs:
+          - targets: ["caddy:2019"]

prometheus/docker-compose.yml

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+networks:
+    prometheus:
+        external: false
+    grafana:
+        name: grafana
+        driver: bridge
+        external: true
+
+services:
+    prometheus:
+        image: prom/prometheus:v3.2.1
+        container_name: prometheus
+        networks:
+            - prometheus
+            - grafana
+        command: "--config.file=/etc/prometheus/prometheus.yaml --storage.tsdb.retention.time=10d storage.tsdb.retention.size=5GB"
+        volumes:
+            - ./data/config/prometheus.yaml:/etc/prometheus/prometheus.yaml:ro
+            - prometheus-data:/prometheus
+
+    node_exporter:
+        image: quay.io/prometheus/node-exporter:v1.9.1
+        container_name: node_exporter
+        networks:
+            - prometheus
+        command:
+            - "--path.rootfs=/host"
+        pid: host
+        volumes:
+            - "/:/host:ro,rslave"
+
+    cadvisor:
+        image: gcr.io/cadvisor/cadvisor:v0.49.1
+        container_name: cadvisor
+        networks:
+            - prometheus
+        volumes:
+            - "/:/rootfs:ro"
+            - "/var/run:/var/run:ro"
+            - "/sys:/sys:ro"
+            - "/var/lib/docker/:/var/lib/docker:ro"
+            - "/dev/disk/:/dev/disk:ro"
+        privileged: true
+        devices:
+            - "/dev/kmsg:/dev/kmsg"
+
+volumes:
+    prometheus-data: