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1b373aed20
pgstat_initialize() is currently used by the WAL stats as a code path to take some custom actions when a backend starts. A callback is added to generalize the concept so as all stats kinds can do the same, for builtin and custom kinds, if set. Reviewed-by: Bertrand Drouvot, Kyotaro Horiguchi Discussion: https://postgr.es/m/ZtZr1K4PLdeWclXY@paquier.xyz