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wal_buffers_full tracks the number of times WAL buffers become full, giving hints to be able to tune the GUC wal_buffers. Up to now, this information was only available in pg_stat_wal. With this field available in WalUsage since eaf502747bac, exposing it in pg_stat_statements is straight-forward, and it offers more granularity at query level. pg_stat_statements does not need a version bump as one has been done in commit cf54a2c00254 for this development cycle. Author: Bertrand Drouvot Reviewed-by: Ilia Evdokimov Discussion: https://postgr.es/m/Z6SOha5YFFgvpwQY@ip-10-97-1-34.eu-west-3.compute.internal