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Marketplace Delivery Error Alerting with 429-Aware Metrics API Polling

Short answer: treat each metrics poll as a bounded, idempotent read, and treat HTTP 429 as an inconclusive observation rather than evidence that notification delivery is healthy or broken.

  • Treat each polling window independently in error alerting.
  • Disregard HTTP 429 responses when calculating checkpoint progress.
  • Only update alert states when observations are tied to a closed window.

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