Hooks Guide for Clean Lifecycles
· 5 min read
Many runtime incidents happen during transitions, not steady state.
A service is starting up, shutting down, draining workers, or flushing telemetry, and behavior is only partially defined. If your deploy process relies on conventions like "we always flush metrics before exit," but nobody enforced that in code, you get data loss during rollouts. If startup checks happen in scattered goroutines, a failing dependency might not block listen, and you serve errors for the first few seconds after deploy.
Fiber v3 hooks give that lifecycle a concrete structure. Instead of hoping everyone follows the same script, you can register pre and post handlers for startup and shutdown and make the behavior reviewable.