Add SLO error-budget tracking with weekly burn-rate report

[thlpkee20-wq]

Description

Define SLOs (availability, p95 latency, payout success) and track error-budget burn weekly. Emit a report and gate deploys when burn-rate exceeds 2x for the previous window.

Requirements and context

• Must be secure, tested, and documented
• Should be efficient and easy to review
• Relevant code: src/lib/metrics.ts, docs/
• Report must be queryable per service line

Suggested execution

• Fork the repo and create a branch
• git checkout -b obs/slo-error-budget
• Implement changes
  • Define SLO YAML and parser
  • Compute burn-rate from metrics history
  • Add weekly cron emitting markdown report
• Validate security and correctness assumptions

Test and commit

• Run tests
  • npm test
• Cover edge cases
  • Gap in metrics, partial week, threshold rounding
• Include test output and notes

Example commit message

obs: SLO error-budget burn-rate tracking

Guidelines

• Minimum 95 percent test coverage
• Clear documentation
• Timeframe: 96 hours

[akinerin]

@akinerin has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Please assign me to this task, I would like to work on it

ℹ️ Repo Maintainers: To accept this application, review their application or assign @akinerin to this issue.