Use the semantics of the standard Incident Command System. Emergency responders have spent decades figuring out the best way to organize for these situations. Tech orgs should leverage that work.
Agreed. ICS is designed to be scalable and flexible (without the marketing fluff that tech companies try to sell).
Am firefighter/emergency manager and regularly train and utilise ICS. It works for any incident you throw at it, even a kids birthday party if you really need it to.
https://en.wikipedia.org/wiki/Incident_Command_System
https://training.fema.gov/nims/