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For a production software service, the scheduled primary on-call responder should receive the first actionable 2 a.m. page. That person acknowledges and triages the incident, then brings in the backup or other specialists if needed. Alerts that do not require immediate human action should not wake someone overnight.
Who gets paged first?
The first recipient should be the on-call person responsible for the affected service—usually a member of the team currently maintaining it. Google SRE describes rotations with a primary and secondary responder; PagerDuty recommends that the first escalation level come from the service’s owning team. See Google SRE’s on-call guidance and PagerDuty’s escalation policy guidance.
The precise arrangement is a team decision. A secondary may act as a fallback if the primary misses a page, or may have a separate role handling less urgent production work. Some systems notify primary and secondary together, but the cited guidance does not establish simultaneous notification as the default or universally best choice.
What is the primary responder expected to do?
A page starts incident response; it does not mean the first person must solve the problem alone. Google SRE says the on-call engineer should acknowledge the page, triage the issue, work toward resolution, and involve colleagues or escalate as needed. PagerDuty likewise describes incident resolution as a team responsibility.
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- Acknowledge: Confirm that someone has taken responsibility for responding.
- Triage: Assess the impact, urgency, and likely scope of the problem.
- Act or escalate: Begin an appropriate response and involve the service owner, backup, or other specialists when the incident requires them.
- Hand over deliberately: If responsibility must pass to another responder, make sure the handoff is agreed rather than assuming someone else has taken over. PagerDuty covers this practice in its on-call shift guidance.
Response-time expectations should reflect the service’s needs and be agreed by the team and business system owners. Google SRE gives five minutes as a typical example for highly time-critical systems and 30 minutes for less time-sensitive systems; these are examples, not a universal service-level agreement.
Which alerts should wake someone overnight?
Page someone at night when an issue requires immediate human action. An alarm by itself is not a reason to wake the rota: the alert should make clear that a responder needs to act now. PagerDuty’s Alerting Principles puts it this way: “Anything that wakes up a human in the middle of the night should be immediately human actionable.” That is PagerDuty’s guidance, not a universal standard.
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| Alert need | Reasonable notification approach |
|---|---|
| Immediate intervention is required | Send an overnight page to the on-call responder. |
| Action is needed but can wait until business hours, or the issue is lower urgency | Use a business-hours alert or track it without waking someone, according to the service’s policy. |
| The event is informational and requires no response | Record or notify without paging a person. |
The timing categories above summarize PagerDuty’s own alerting framework. A team should set its priorities according to the actual response required, its service objectives, and the consequences of waiting—not simply because monitoring software generated an alert.
What if the primary does not respond?
A defined escalation path should route an unacknowledged page to a backup or another responsible responder. PagerDuty recommends a second escalation level to catch notifications that have not been acknowledged. The waiting period should depend on the service tier and its service-level objective (SLO); the guidance does not prescribe one interval for every service.
The primary can also escalate manually when the incident is beyond their expertise or capacity. The purpose of the rota is to get the right response moving, not to leave the first recipient isolated with every technical problem.
How should a team choose its on-call design?
There is no single rotation that fits every service. Team size, service criticality, geography, and local policy affect which design works. Teams can make the main choices explicitly:
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- Service-owning primary or centralized first line: A responder from the maintaining team is closer to the service; a centralized responder may route or coordinate incidents. PagerDuty’s cited service-ownership guidance recommends that the first escalation level come from the group maintaining the service.
- Secondary as fallback or simultaneous notification: A fallback limits unnecessary interruptions to the backup, while notifying both can make sense under a team’s policy. The cited sources establish primary/secondary and fallback arrangements but do not prescribe one notification pattern for all teams.
- Overnight page or deferred notification: Match the alert channel and timing to how soon a person must act.
- Fixed-site rota or follow-the-sun coverage: Choose coverage that fits the team’s geography and ability to provide a reliable handoff; the cited sources do not designate one model as universally preferable.
- Escalation timing: Set acknowledgment and escalation expectations in line with the service’s tier and SLO.
How do teams keep pages useful?
Frequent low-priority or nonactionable pages can disrupt work and make responders less attentive to serious alerts. Google SRE recommends making pages actionable, grouping related alerts, and reviewing operational load. Its on-call workbook also recommends reviewing and testing new paging rules and ensuring responders have suitable playbooks.
Google SRE reports that its on-call incident work averages six hours, including root-cause analysis, remediation, and follow-up. The same chapter derives a maximum of two incidents per 12-hour shift from that estimate, and the workbook separately says its teams target no more than two incidents per shift. These figures describe Google’s SRE practice, not an independently established industry-wide average or required limit.
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- Review pages after incidents and remove or reclassify alerts that did not require immediate action.
- Group alerts that describe the same underlying problem where appropriate.
- Test paging rules and make sure the relevant response instructions are available.
- Review the shift’s load so recurring interruptions can be addressed rather than normalized.
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