Log in to Pingdom:
Click Experience Monitoring on the left hand side to expand, and click Uptime:
Places to Pay Attention to, and Investigate:
If Uptime is red for any reason, and a site is showing, it will need to be investigated immediately. Let the Infrastructure Manager and Associate Director/Director of Support know ASAP.
If Maintenance is red for any reason, make sure it is because there is a scheduled rollout, or other coordinated reason for the site(s) to be down.