Add node.exported monitoring (#22)

* Add node-exporter to collect node metrics

* Increase monitoring scraping time to avoid costs in AWS

Author: acs

docker/prometheus/prometheus.yml

@@ -4,7 +4,7 @@ scrape_configs:
   # The job name is added as a label `job=<job_name>` to any timeseries scraped from this config.
   - job_name: 'prometheus'
 
-    scrape_interval: 5s
+    scrape_interval: 15s
 
     # metrics_path defaults to '/metrics'
     # scheme defaults to 'http'.
@@ -15,7 +15,7 @@ scrape_configs:
   # Create a job for Docker Swarm containers.
   - job_name: 'dockerswarm'
 
-    scrape_interval: 5s
+    scrape_interval: 15s
 
     dockerswarm_sd_configs:
       - host: unix:///var/run/docker.sock