SLO / SLI / Error Budgets
Service Level Indicators (what you measure), Service Level Objectives (target you commit to), and Error Budgets (the gap that funds risk). Multi-window multi-burn-rate alerts from the Google SRE Workbook. Tooling: Sloth, Pyrra, Nobl9, Datadog SLO, Grafana SLO, Honeycomb SLO.
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