Tenant Failure Alerting via Metrics API Poll Queries (Preserving Reconstruction Evidence)

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The page says tenant_experiment stalled, but the on-call needs a more useful answer: which cohort stopped, which scheduled evaluation observed it, and whether the notification represents a new failure or a replay. The least complex design that preserves those answers is a scheduled poller with a small durable state record. It queries one failure-oriented metric, evaluates freshness and consecutive failures, then sends an idempotent webhook containing the evidence used for the decision. TL;DR: For a small property-management application, polling a metrics query endpoint is a reasonable failure-

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