docs(prometheus-exporter): add README and sample compose setup

prometheus-exporter/support/compose.yml

@@ -0,0 +1,31 @@
+services:  
+  grafana:
+    image: grafana/grafana-oss
+    container_name: factorio_grafana
+    restart: unless-stopped
+    ports:
+      - 3000:3000
+    volumes:
+      - ./grafana/config:/etc/grafana/provisioning/datasources:ro
+      - factorio_grafana:/var/lib/grafana:Z
+
+  prometheus:
+    image: prom/prometheus
+    container_name: factorio_prometheus
+    restart: unless-stopped
+    volumes:
+      - factorio_prometheus:/prometheus:Z
+      - ./prometheus/config:/etc/prometheus:ro
+
+  sidecar:
+    image: httpd:latest
+    container_name: factorio_prometheus_sidecar
+    restart: unless-stopped
+    volumes:
+      - ~/.factorio/script-output:/usr/local/apache2/htdocs:ro
+
+volumes:
+  factorio_grafana:
+    external: true
+  factorio_prometheus:
+    external: true

prometheus-exporter/support/grafana/config/datasource.yml

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+apiVersion: 1
+
+datasources:
+- name: Prometheus
+  type: prometheus
+  url: http://factorio_prometheus:9090 
+  isDefault: true
+  access: proxy
+  editable: true

prometheus-exporter/support/prometheus/config/prometheus.yml

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+global:
+  scrape_interval: 15s
+  scrape_timeout: 10s
+  evaluation_interval: 15s
+alerting:
+  alertmanagers:
+  - static_configs:
+    - targets: []
+    scheme: http
+    timeout: 10s
+    api_version: v2
+scrape_configs:
+- job_name: factorio
+  honor_timestamps: true
+  scrape_interval: 15s
+  scrape_timeout: 10s
+  metrics_path: /metrics.prom
+  scheme: http
+  static_configs:
+  - targets:
+    - factorio_prometheus_sidecar:9010