Definition: Formal agreement between provider and client defining service level commitments, including guaranteed availability, performance, and response times.
— Source: NERVICO, Product Development Consultancy
What Is an SLA
A Service Level Agreement (SLA) is a formal contract or agreement defining service level commitments between a provider and its client. It establishes specific metrics such as guaranteed availability (for example, 99.9%), maximum response times, minimum performance, and applicable compensations when these commitments are not met. It is the document that translates service expectations into measurable contractual obligations.
How It Works
A typical SLA defines measurable indicators (SLIs), objectives for those indicators (SLOs), and the consequences of not meeting them. For example, a cloud SLA may commit to 99.95% monthly availability, measured as the percentage of error-free minutes over total minutes in the month. If actual availability falls below the commitment, the provider applies service credits proportional to the severity of the breach. AWS SLAs, for instance, offer credits from 10% to 100% depending on the unavailability level.
Key Use Cases
- Formalizing availability commitments between a SaaS provider and its enterprise clients
- Defining maximum response times for technical support by incident severity level
- Establishing automatic economic compensations when service levels are not met
- Governance of internal services between platform teams and product teams in large organizations
Advantages and Considerations
SLAs create transparency and expectation alignment between provider and client, reducing conflicts and providing an objective framework for evaluating service quality. They also incentivize the provider to maintain high operational standards. The main consideration is that an overly aggressive SLA can be costly to fulfill, while an overly lenient one does not build trust. The balance between infrastructure cost and service commitment is a critical business decision.