Oncalls get paged first and then escalate. As they assess impact to other teams and orgs, they usually post their tickets to a shared space. Once multiple team/org impact is determined, leadership and relevant ops groups (networking, eg) get pulled in to a call. A single ticket gets designated the Master Ticket for the Event, and oncalls dump diagnostic info there. Root cause is found (hopefully), affected teams work to mitigate while RC team rushes to fix.
The largest of these calls I've seen was well into the hundreds of sw engineers, managers, network engineers, etc.
The largest of these calls I've seen was well into the hundreds of sw engineers, managers, network engineers, etc.