On Call
In plain terms
Being available to respond to system issues outside hours.
Going deeper
On-call rotations assign engineers to respond to alerts and incidents at any time, ensuring round-the-clock coverage. Someone is always reachable.
Under the hood
Rotations and escalation policies share the burden; healthy on-call limits alert fatigue and toil.
Examples
Rotations, PagerDuty, incident response, escalations, SRE, alerting.
Think of it like...
Like a doctor on call ready to respond to emergencies anytime.