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Protocol v4 introduces parallel streaming, which allows Stream Abort messages to include additional abort information such as LSN and timestamp. However, the current documentation only states, "This field is available since protocol version 4," which may misleadingly suggest that the fields are always present when using protocol v4. This patch clarifies that the abort LSN and timestamp are included only when parallel streaming is enabled, even under protocol v4. Author: Anthonin Bonnefoy <anthonin.bonnefoy@datadoghq.com> Reviewed-by: Amit Kapila <amit.kapila16@gmail.com> Backpatch-through: 16, where it was introduced Discussion: https://postgr.es/m/CAO6_XqoKteQR1AnaR8iPcegbBE+HkAc2-g12rxN04yOt4-2ORg@mail.gmail.com