Add Pool.on_acquire hook with AcquireEvent#1320
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Adds an optional `on_acquire` callback to `Pool` / `create_pool`, mirroring the existing setup/init/reset style. The callback is invoked synchronously with an `AcquireEvent(wait_seconds, size, idle, max_size)` after every successful `Pool.acquire` dispatch. Lets applications detect pool saturation (long wait, idle == 0) without subclassing the pool or wrapping every callsite. Callback exceptions are logged and suppressed. No behavior change when unused.
Caller branches in `_acquire` so `_fire_on_acquire` does not need a redundant None check.
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Adds an optional
on_acquirecallback toPool/create_pool, mirroring the existing setup/init/reset style. The callback is invoked synchronously with anAcquireEvent(wait_seconds, size, idle, max_size)after every successfulPool.acquiredispatch. Lets applications detect pool saturation (long wait, idle == 0) without subclassing the pool or wrapping every callsite. Callback exceptions are logged and suppressed. No behavior change when unused.