Not aware of any feature or capability to monitor data pages.
We are planning to offer support for custom alerts / events in PDC and a client ruleset with RUF's and activities that can be integrated into application to send events to PDC. Are your data pages loaded by activities or do you use data transform, reports or connectors directly from the data flow definition?
Are any of your pages keyed or parameter driven? Would you consider loading tied to specific keys / parameters to be a "reload"?