On-Call Best Practices for Engineering Teams: Building a Sustainable Incident Response Culture
Being on-call is a reality for most engineering teams today. As systems become more complex and customers expect 24/7 availability, having a well-structured on-call process is crucial for maintaining reliability while keeping your team happy and productive.
But let's face it: poorly managed on-call rotations can lead to burnout, decreased morale, and ultimately, worse service for your customers. The good news? With the right practices in place, you can create an on-call culture that balances operational excellence with team well-being.
Understanding the Foundation: SLIs, SLOs, and SLAs
Before diving into on-call practices, it's essential to understand what you're protecting. Your on-call team exists to maintain your service level objectives (SLOs), which are built on service level indicators (SLIs) and often formalized in service level agreements (SLAs) with customers.
SLIs are the metrics that matter most to your users - things like response time, error rate, or availability. SLOs are the targets you set for these metrics, while SLAs are the contractual commitments you make to customers. Your on-call team's primary job is to respond when these metrics are threatened.
Building a Sustainable On-Call Rotation
1. Right-Size Your Rotation
The ideal on-call rotation has enough people to prevent burnout but not so many that engineers lose touch with production systems. Most teams find success with 4-8 engineers in a rotation. This ensures:
- No one is on-call more than once a month
- Engineers stay familiar with systems
- There's coverage for vacations and sick days
2. Define Clear Escalation Paths
Not every alert needs to wake someone up at 3 AM. Create clear escalation policies that match the severity of issues:
- Critical: Customer-facing outages that violate SLOs
- High: Issues affecting internal systems or degraded performance
- Medium: Problems that can wait until business hours
- Low: Informational alerts for tracking
3. Invest in Quality Runbooks
A good runbook can turn a stressful 3 AM incident into a manageable situation. Every alert should have a corresponding runbook that includes:
- Clear description of what the alert means
- Step-by-step troubleshooting instructions
- Common fixes and their expected outcomes
- Escalation contacts if the issue persists
- Links to relevant dashboards and logs
Remember: runbooks should be living documents. After each incident, update them with new learnings. As outlined in our guide on how to write effective incident post-mortems, documenting what went wrong and how it was fixed is crucial for continuous improvement.
Leveraging DevOps Practices for Better On-Call
Embrace Error Budgets
One of the most powerful concepts from Site Reliability Engineering is the error budget. If your SLO is 99.9% uptime, you have 43 minutes of downtime per month to "spend." This budget helps teams:
- Make informed decisions about risk
- Balance feature velocity with reliability
- Reduce unnecessary pages for minor issues
Automate What You Can
The best on-call page is the one that never happens. Invest in automation to handle common issues:
- Auto-scaling for traffic spikes
- Self-healing systems that restart failed services
- Automated rollbacks for failed deployments
- Intelligent alerting that groups related issues
Creating a Positive On-Call Culture
1. Compensate Fairly
Being on-call is demanding work that happens outside normal hours. Consider:
- Time-off in lieu for weekend on-call shifts
- Additional compensation for on-call hours
- Reduced workload during on-call weeks
- Flexibility to work from home when on-call
2. Protect On-Call Time
When someone is on-call, their primary responsibility is incident response. This means:
- No critical meetings during on-call shifts
- Reduced sprint commitments
- Time allocated for runbook updates and system improvements
- Protected time for rest after night incidents
3. Share the Knowledge
Avoid creating heroes who are the only ones who can fix certain issues. Implement:
- Pair debugging during incidents
- Regular knowledge-sharing sessions
- Rotation of primary and secondary on-call
- Documentation requirements for all systems
Measuring and Improving Your On-Call Process
Track metrics that matter for both reliability and team health:
System Metrics: - Mean time to resolution (MTTR) - Number of pages per shift - False positive rate - Repeat incident rate
Team Metrics: - On-call load distribution - Time between on-call shifts - After-hours page frequency - Team satisfaction scores
Regularly review these metrics and adjust your process. If certain team members are getting paged more often, investigate why. If MTTR is increasing, it might be time to update your runbooks or invest in better monitoring.
Communication During Incidents
Effective incident communication is just as important as technical response. Your on-call team should have clear protocols for keeping stakeholders informed. This includes internal updates to leadership and external communication to customers through status pages.
Tools like StatusRay can help automate incident communication, ensuring customers stay informed without adding to the on-call engineer's workload. When engineers can focus on fixing issues rather than fielding customer inquiries, resolution times improve significantly.
Looking Forward: The Future of On-Call
As systems become more complex and customer expectations continue to rise, on-call practices must evolve. The most successful teams are those that:
- Continuously refine their processes based on data
- Invest in tools and automation to reduce toil
- Prioritize team well-being alongside system reliability
- Build a culture where being on-call is seen as a shared responsibility, not a burden
Remember, the goal isn't to eliminate all incidents - that's impossible. The goal is to build a sustainable system where your team can effectively respond to incidents while maintaining their sanity and work-life balance.
Frequently Asked Questions
What's the ideal length for an on-call shift?
Most teams find one-week rotations work best. This provides consistency without causing fatigue. Some teams prefer shorter 3-4 day shifts for high-incident services, while others do two-week rotations for more stable systems. The key is finding what works for your team's specific needs and incident volume.
How do we handle on-call during holidays and vacations?
Plan holiday coverage well in advance and consider offering incentives like extra time off or compensation for holiday shifts. Create a backup schedule and ensure at least two people are available during major holidays. Some teams also implement "follow the sun" coverage with international team members to reduce the burden.
Should junior engineers be included in on-call rotations?
Yes, but with proper support. Pair junior engineers with experienced mentors for their first few rotations. Start them as secondary on-call to observe and learn before taking primary responsibilities. This helps them gain valuable production experience while ensuring they're not overwhelmed.
What tools are essential for effective on-call management?
At minimum, you need: an alerting system (like PagerDuty or Opsgenie), comprehensive monitoring tools, centralized logging, clear runbook documentation, and incident communication tools. A status page service helps keep customers informed during incidents without adding to the on-call burden.
How do we reduce alert fatigue?
Regularly review and tune your alerts. Remove or adjust alerts that frequently fire without indicating real issues. Implement smart grouping to prevent alert storms. Set appropriate thresholds based on your SLOs, not arbitrary values. Most importantly, fix the root causes of frequent alerts rather than just acknowledging them.
What's the difference between primary and secondary on-call?
Primary on-call is the first responder who receives initial alerts and begins troubleshooting. Secondary on-call serves as backup if the primary doesn't respond within a set time (usually 5-15 minutes) or needs help with complex issues. This two-tier system ensures coverage while distributing the workload.
