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The purpose of the function is to reduce the effective autovacuum_multixact_freeze_max_age if the multixact members SLRU is approaching wraparound, to make multixid freezing more aggressive. The returned value should therefore never be greater than plain autovacuum_multixact_freeze_max_age. Reviewed-by: Robert Haas Discussion: https://www.postgresql.org/message-id/85fb354c-f89f-4d47-b3a2-3cbd461c90a3@iki.fi Backpatch-through: 12, all supported versions