I'd love to be able to setup an alert anytime the total content on my home page is > 5MB downloaded to the browser.
This will allow me to action image and content optimzations with my team as home ...
This is only possible right now using Report API and collecting the 'bytes' information for each call on the page, summing the total, and measuring it against a threshold like AlertSite does with performance Alerts currently. It's a good use case for alerts on non-specific content changes in general, especially as they impact metrics in reporting. For example, a Full Page time increases of 50% may be acceptable, if the browser is downloading twice as much content on the same page suddenly versus prior runs.