We put Site-Wide incident in a different category with normal incident due to more crucial resolution speed and complexity involved.
Only Deri, Budi, Denni is expected to be the PIC handling Site-Wide incident (with @web-infra and @site-infra as primary supporting parties). They will in turn involve people as necessary. We don't expect anyone to be able to be the PIC and coordinate for this type of incident.
On Site-Wide incident, your response should be to immediately tag Deri, Budi, Denni, or call their phone numbers if necessary

Update to Incident Handling Process