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2c5b57ec7f
Per a recommendation from Tomas Vondra, it's more helpful to refer to the value that determines how skewed a Gaussian or exponential distribution is as a parameter rather than a threshold. Since it's not quite too late to get this right in 9.5, where it was introduced, back-patch this. Most of the patch changes only comments and documentation, but a few pgbench messages are altered to match. Fabien Coelho, reviewed by Michael Paquier and by me.