Service level objective monitoring#96
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elizabetheonoja-art merged 2 commits intoJul 18, 2026
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Add SLO burn-rate monitoring, tests, and documentation
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Motivation
Provide a small, dependency-free SLO evaluation component that services can use to detect availability and latency regressions via burn-rate windows and to power alerting/dashboard labels.
Encode the shared objectives of 99.99% availability and <100 ms P99 latency and make canary/blue-green analysis simpler and auditable.
Description
Add meter-simulator/src/slo-monitor.js, a compact SLOMonitor implementation with DEFAULT_CONFIG (availabilityTarget 0.9999, latencyP99TargetMs 100) and multi-window burn-rate evaluation (fast and slow) plus evaluate, evaluateWindow, and buildAlert helpers.
Add unit tests in meter-simulator/tests/slo-monitor.test.js covering healthy windows, fast-window page alerts, latency SLO violations, and custom canary windows.
Add documentation docs/SLO_MONITORING.md describing objectives, architecture, burn-rate policy, blue-green/canary rollout guidance, and a security review checklist.
Testing
Ran the meter-simulator test suite with cd meter-simulator && npm test -- --runInBand slo-monitor.test.js, which passed: 1 test suite, 4 tests all succeeded.
The new module is exercised by the Jest tests SLOMonitor unit tests and the test run completed without failures.
Closes #88