When Flow Control Flows Against You

I've just published ADR-0024 and, based on it, a new gRPC Communication Guide documenting when flow control helps and when it interferes.

The decision was straightforward once the analysis was done: implement flow control for event streaming (where slow clients can block fast ones) but avoid it entirely for API requests (where gRPC's threading model and STM transactions already coordinate beautifully).

Sometimes the most sophisticated solution is knowing where not to add sophistication.

The guide covers the technical reasoning and includes practical examples for anyone implementing gRPC clients, regardless of language choice.

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