Type Alias: CostGuardMode

CostGuardMode = "warn" | "reject" | "kill"

Defined in: observability/src/cost-guard-advanced.ts:24

Production-grade cost guard. Extends the multi-tenant guard with:

• Modes: warn (log only) · reject (per-tenant flag, no abort) · kill (disable the tenant runtime via an injected disableRuntime callback; requires explicit re-enable).
• Window caps: per-minute / per-day / per-month rolling buckets. Each window has its own threshold; tripping any one fires alerts and (in kill mode) disables the tenant.
• Linear forecasting: at 50 / 80 / 100 % of any window cap, emit a cost:threshold alert with an extrapolated time-to-cap.
• Pluggable alert sinks: the same contract regardless of where the alert lands (Slack webhook, PagerDuty, email gateway).
• Throttled alerting: at most one alert per (tenant, window, threshold) per cap window — avoids alert storms.

Closes #787 (hard-kill), #788 (forecasting + caps), #789 (alert sinks). Chargeback report (#790) lives in chargebackReport() below.