We're trying to find a safe zone of page numbers that we can use beyond 9998 as APEX seems to be occupying 9999-20020 for its predefined pages, leaving a gap between 10100-19999. Our app has mini apps in increments of 100s and pages in increments of 10s (eg: app 200 will have page numbers 2000-2999).
Are these APEX feature page numbers set in stone or can we re-number them to say 20000+ or just renumber the last 3 pages to below 11000? Will re-numbering them cause any issues in future upgrades? Or is there a safe zone without causing any future collisions? There are settings on app creation wizard where we can set a page as Home or Admin page and also settings in App Definition > User Interface to specify Home and Login page URLs but no options for these other APEX feature pages to alter their numbers:
9999 Login
10000 Administration
10010 Configuration Options
10020 Application Appearance
10030 Activity Dashboard
10031 Top Users
10032 Application Error Log
10033 Page Performance
10034 Page Views
10035 Automations Log
10036 Log Messages
10040 Configure Access Control
10041 Manage User Access
10042 Manage User Access
10043 Add Multiple Users - Step 1
10044 Add Multiple Users - Step 2
10050 Feedback
10051 Feedback Submitted
10053 Manage Feedback
10054 Feedback
10060 About
10061 Help
20000 Settings
20010 Push Notifications
20020 Email Reporting
There may be newer APEX pages in addition to the above we aren't aware of.