How to send an email notification to specific set of users when a Salesforce Visualforce Page gets updated?

Hello,

ublic class CheckPageUpdates implements Schedulable {
public void execute(SchedulableContext context) {
LastTimeChecked__c check = LastTimeChecked__c.getOrgDefaults();
if(check != null) {
check = new LastTimeChecked__c(LastCheckedDateTime__c=DateTime.now());
}
ApexPage[] pagesModified = [SELECT Name FROM ApexPage WHERE LastModifiedDate <= :check.LastCheckedDateTime__c];
if(!pagesModified.isEmpty()) {
// Send an email or something here
}
check.LastCheckedDateTime__c = DateTime.now();
upsert check;
}
You can schedule this for whatever frequency you like, such as hourly:

System.schedule('MonitorVFChanges', '0 0 * * * ?', new CheckPageUpdates());