Service Level Objectives and Error Budgets
Learn how SaaS teams define reliability with SLAs, SLOs, and SLIs, and use error budgets to balance shipping speed against stability.
Defining Reliability
Reliability cannot be improved if it is not measured. SaaS teams use a vocabulary of three terms: SLI, SLO, and SLA.
Together they turn 'the system should be up' into precise, trackable targets.
Service Level Indicator (SLI)
An SLI is a measured value describing service quality, such as:
- Request success rate
- Latency (95th percentile response time)
- Availability (uptime percentage)
SLIs are the raw signals you collect.
All lessons in this course
- High Availability & Disaster Recovery
- Monitoring & Alerting Systems
- Logging & Distributed Tracing
- Service Level Objectives and Error Budgets