SLAs establish mutual understanding between providers and customers about service expectations, creating accountability and a framework for measuring performance.
Why it matters
- Sets clear expectations for both parties.
- Provides remedies (usually credits) when service falls short.
- Helps customers evaluate and compare service providers.
- Creates incentives for providers to maintain quality.
- Essential for compliance and audit requirements.
Key SLA components
- Service description: What's being provided.
- Performance metrics: Measurable criteria (uptime, latency, throughput).
- Measurement methodology: How metrics are calculated and reported.
- Remedies: Compensation for failures (service credits, refunds).
- Exclusions: What's not covered (maintenance windows, customer-caused issues).
Related terms
- SLO (Service Level Objective): Internal target, usually stricter than SLA.
- SLI (Service Level Indicator): Actual measured metric.
- Error budget: Allowable amount of unreliability (100% - SLO).
Common SLA metrics
- Availability/Uptime: Percentage of time service is operational.
- Response time: How quickly the service responds to requests.
- Resolution time: How long to fix reported issues.
- Throughput: Transactions or operations per time period.
- Support response: Time to initial response for support tickets.
SLA calculations example
- Monthly uptime of 99.9% = Maximum 43.8 minutes downtime.
- If actual downtime is 60 minutes, SLA is breached.
- Remedy might be 10% service credit for that month.
Best practices
- Define metrics precisely to avoid disputes.
- Establish monitoring and reporting mechanisms.
- Review SLAs regularly as needs change.
- Understand exclusions and maintenance windows.
- Document escalation procedures for SLA breaches.
- Negotiate meaningful remedies that incentivize performance.
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