slo-implementation

# SLO Implementation Framework for defining and implementing Service Level Indicators (SLIs), Service Level Objectives (SLOs), and error budgets. ## Purpose Implement measurable reliability targets using SLIs, SLOs, and error budgets to balance reliability with innovation velocity. ## When to Use - Define service reliability targets - Measure user-perceived reliability - Implement error budgets - Create SLO-based alerts - Track reliability goals ## SLI/SLO/SLA Hierarchy ``` SLA (Service Level Agreement) ↓ Contract with customers SLO (Service Level Objective) ↓ Internal reliability target SLI (Service Level Indicator) ↓ Actual measurement ``` ## Defining SLIs ### Common SLI Types #### 1. Availability SLI ```promql # Successful requests / Total requests sum(rate(http_requests_total{status!~"5.."}[28d])) / sum(rate(http_requests_total[28d])) ``` #### 2. Latency SLI ```promql # Requests below latency threshold / Total requests sum(rate(http_request_duration_seconds_bucket{le="0.5"}[28d])) / sum(rate(http_request_duration_seconds_count[28d])) ``` #### 3. Durability SLI ``` # Successful writes / Total writes sum(storage_writes_successful_total) / sum(storage_writes_total) ``` **Reference:** See `references/slo-definitions.md` ## Setting SLO Targets ### Availability SLO Examples | SLO % | Downtime/Month | Downtime/Year | | ------ | -------------- | ------------- | | 99% | 7.2 hours | 3.65 days | | 99.9% | 43.2 minutes | 8.76 hours | | 99.9...