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c54b5891f4
The previous definition of the column was almost universally disliked, so provide this updated definition which is more useful for monitoring purposes: a large positive value is good, while zero or a negative value means danger. This should be operationally more convenient. Backpatch to 13, where the new column to pg_replication_slots (and the feature it represents) were added. Author: Kyotaro Horiguchi <horikyota.ntt@gmail.com> Author: Álvaro Herrera <alvherre@alvh.no-ip.org> Reported-by: Fujii Masao <masao.fujii@oss.nttdata.com> Discussion: https://postgr.es/m/9ddfbf8c-2f67-904d-44ed-cf8bc5916228@oss.nttdata.com