Ensure the integrity of the pages that you check with SiteAlarm using Content Scan.
Content Scan checks for the presence - or absence - of certain text on the pages that are checked.
You can add a word or text string that should always appear on the page you are checking, and you will be alerted if this is not detected.
You can add a negative word or string that should not appear on the page you are checking, and you will be alerted if this is detected.