cadvisor: reduce CPU usage

prometheus.yaml

@@ -15,6 +15,9 @@ services:
     image: gcr.io/cadvisor/cadvisor:latest
     restart: always
     container_name: cadvisor
+    command:
+      - '--housekeeping_interval=15s'
+      - '--docker_only=true'
     volumes:
     - /:/rootfs:ro
     - /var/run:/var/run:rw

prometheus/prometheus.yaml

@@ -1,17 +1,17 @@
 global:
-  scrape_interval: 15s 
+  scrape_interval: 30s
   external_labels:
     monitor: 'codelab-monitor'
  
 scrape_configs:  
   # nginx vts data
   - job_name: 'nginx'
-    scrape_interval: 5s
+    scrape_interval: 30s
     metrics_path: "/status/format/prometheus"
     static_configs:
       - targets: ['nginx:80']
   - job_name: 'metrics'
-    scrape_interval: 5s
+    scrape_interval: 30s
     static_configs:
       # grafana data from /metrics
       - targets: ['dashboard:3000']
@@ -20,7 +20,7 @@ scrape_configs:
       # cadvisor system
       - targets: ['cadvisor:8080']
   - job_name: "synapse"
-    scrape_interval: 15s
+    scrape_interval: 30s
     metrics_path: "/_synapse/metrics"
     static_configs:
       - targets: ["matrix-synapse:9000"]