Google apps status dashboard displays its major applications and their performance and downtime for the last one week. The dashboard reports are categorized into three main areas for every application as No issues, Service disruption and Service outage. These reports are applicable to both public version and enterprise applications hosted via Google Apps. The applications are also categorized into two categories one set of applications which are covered as defined in the service level agreement and next set of those that are not covered by service level agreements. The timings are reported in local time zone.
To view the dashboard click http://www.google.com/appsstatus
To check the service disruption in the past click on Older link located at the bottom of the table and status for last two months are displayed in the dashboard. Normally Google products go down very rarely and whenever it does you can check the status here and be informed.