IS_ONE_PROCESS variable

Default for PgPubSubOptions.singleListener — on.

With it on, an inter-process lock elects exactly ONE process to receive each channel's notifications, which is what makes scaling out safe: LISTEN/NOTIFY delivers to every listening connection, so without the lock every replica handles every message. Turn it off only when you genuinely want a broadcast to all replicas.

Signature:

IS_ONE_PROCESS = true

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