5838. Proxy & Routing: backend health checks — Automate the workflow with idempotent retries and observability. — logistics — PHP PDO

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Scenario: A logistics application must handle backend health checks. Automate the workflow with idempotent retries and observability. Explain the invariant, SQL strategy, transaction/locking behavior, failure handling, observability and test plan. Use MySQL 8-oriented syntax where applicable.
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