feat: add Prometheus alerting rules for API latency and error-rate SLAs (#846)#863
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- Add twitter and openGraph fields to root layout metadata (global default) - Create (auth)/layout.tsx with Twitter Cards for login, signup, verify-email - Extend metadata in editor, search, study-groups, leaderboard, privacy pages - Add Twitter Cards to generateMetadata in topics/[slug] and courses/[courseId] - Add unit tests to verify twitter card fields across layout files Closes rinafcode#378
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Summary
Closes #846
Adds Prometheus alerting rules for SLA breach detection on the TeachLink backend, along with Alertmanager Slack routing config and on-call runbooks. Previously, SLA breaches were only detectable by manually watching dashboards.
Changes
New files
charts/teachlink-backend/templates/prometheus-rules.yaml: PrometheusRule CR with 4 alerts
charts/teachlink-backend/values.yaml: configurable thresholds, Alertmanager/Slack routing
charts/teachlink-backend/Chart.yaml: Helm chart metadata
charts/teachlink-backend/templates/_helpers.tpl: standard Helm template helpers
docs/RUNBOOKS.md: on-call runbook for all 4 alerts