Move wal_buffers_full to WalUsage (and report it in pgss/explain)

When Who What
2025-02-17 06:27:17 Michael Paquier (michael-kun) Closed in commitfest 2025-03 with status: Committed
2025-02-17 06:27:17 Michael Paquier (michael-kun) Changed committer to michael-kun
2025-02-06 10:30:13 Bertrand Drouvot (bertranddrouvot.pg) Changed authors to Bertrand Drouvot (bertranddrouvot.pg)
2025-02-06 10:30:13 Bertrand Drouvot (bertranddrouvot.pg) Changed targetversion to 18
2025-02-06 10:29:57 Bertrand Drouvot (bertranddrouvot.pg) Attached mail thread Z6SOha5YFFgvpwQY@ip-10-97-1-34.eu-west-3.compute.internal
2025-02-06 10:29:57 Bertrand Drouvot (bertranddrouvot.pg) Created patch record