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FastAPI utilizes the lifespan context manager to handle application startup and shutdown logic. This mechanism allows developers to manage resources like database connection pools or HTTP clients across the entire application lifecycle. While the startup phase is straightforward, the shutdown phase lacks a built-in framework constraint to enforce a maximum e
The goal is to configure application lifecycle handling so that monitoring alerts capture real startup and shutdown failures without generating noise from deprecation signals during a migration period. FastAPI 0.93 introduced the lifespan async context manager as the documented standard for startup and shutdown management, with @app.on_event("startup") and @
Choosing a Lifecycle Hook for Upgrade Safety When deploying a FastAPI application, a failed upgrade can leave resources—such as database connections or external services—in an inconsistent state. FastAPI exposes two primary mechanisms for initializing and cleaning up resources: the lifespan context manager and the legacy @app.on_event('startup') / @app.on_ev
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