The on-call model is one of the pillars of any technological operation that requires continuity.
It ensures that, in the event of an incident, there is always someone responsible for reacting.
But while the concept seems simple, in practice there are many nuances that make the difference between a system that works… and one that generates frustration.
In simple
The on-call is a scheme where:
👉 a person (or team) is available to respond to incidents in a given time frame
This may be:
- after working hours
- during weekends
- on rotating shifts
- or even 24/7
The objective is clear:
👉 not relying on chance when a problem occurs.
How it works in practice
A typical on-call flow looks like this:
- A system detects an alert
- A notification is generated
- Assigned to the engineer on duty
- That person evaluates and acts
- If no response, it is scaled
👉 it’s all about ensuring timely response.
Key components of a good on-call
For the model to work well, it needs more than just “shifts”.
1. Shift schedule
Define who is available at any given time.
- weekly or daily rotation
- coverage by team or specialty
- total clarity of responsibilities
👉 avoid confusion at critical moments
Notification system
It is in charge of alerting the on-call.
May include:
- push
- telephone calls
👉 here you define whether or not the alert is actually heeded
3. Confirmation of receipt
It is not enough to send the alert.
👉 you need to know if someone took it.
This allows:
- avoid “orphan” incidents
- enable automatic scaling
- to ensure liability
4. Automatic scaling
If the on-call does not answer:
- another engineer is notified
- or at a higher level
- or an entire team
👉 ensures that the incident does not go unattended.
Most common on-call types
Reactive on-call
- only responds when an incident occurs
- is the most traditional model
Preventive on-call
- actively monitors
- anticipates problems
- acts before impact
👉 more mature, but also more demanding.
Distributed on-call
- different teams according to type of incident
- e.g. infrastructure, applications, database, etc.
👉 improves specialization, but requires coordination
Typical on-call problems
Although necessary, it is often poorly implemented.
Some common problems:
- alerts that no one answers
- excessive notifications (alert fatigue)
- unclear shifts
- dependence on checking emails or messages
- lack of context when receiving the alert
👉 the result: slow response times
What makes an on-call work well
A good on-call system achieves:
- that critical alerts are impossible to ignore
- that there is always a clear person in charge
- that there is automatic scaling
- that the information arrives with context
👉 not only warns, it ensures response.
Simple example
Scenario without good on-call
- alert arrives by mail
- no one checks it in time
- the incident escalates
Result: business impact
Scenario with good on-call
- alert is sent to the person in charge
- receives immediate notification
- confirms receipt
- acts or scale
Result: rapid incident control
Something important
The on-call is not just one shift.
It is a complete response system.
Includes:
- people
- processes
- technology
👉 if one fails, all fails
What changes when well implemented
When the on-call is working properly:
- decrease reaction times
- reduction in unattended incidents
- improves business continuity
- lowers the dependence on manual supervision
👉 operation becomes much more reliable.
Today, many companies already have on-call, but still have reaction problems.
That’s where the focus is not on having shifts, but on how they are managed.
👉 24Cevent enables automated on-call management, assigning responsible parties, notifying through multiple channels (including calls), ensuring confirmation of attention and automatically escalating when necessary.
