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When pg_recvlogical receives a SIGHUP signal, it closes the current output file and reopens a new one. This is useful since it allows us to rotate the output file by renaming the current file and sending a SIGHUP. This behavior was previously undocumented. This commit adds the missing documentation. Back-patch to all supported versions. Author: Fujii Masao <masao.fujii@gmail.com> Reviewed-by: Shinya Kato <shinya11.kato@gmail.com> Discussion: https://postgr.es/m/0977fc4f-1523-4ecd-8a0e-391af4976367@oss.nttdata.com Backpatch-through: 13