What happens when no one responds to an alert?

When no one responds to an alert, the problem is not the alert itself: it is that the incident goes unattended.
That means the system continues to fail, the impact grows over time and, in many cases, the customer ends up detecting it before the team does.

What is software incident management?

Software incident management is the process of detecting, communicating and resolving failures in technological systems as quickly as possible, with the objective of minimizing their impact on users and the business.