Add wal_fpi_bytes to VACUUM and ANALYZE logs

The new wal_fpi_bytes counter calculates the total amount of full page
images inserted in WAL records, in bytes.  This commit adds this
information to VACUUM and ANALYZE logs alongside the existing counters,
building upon f9a09aa.

Author: Shinya Kato <[email protected]>
Reviewed-by: Michael Paquier <[email protected]>
Discussion: https://postgr.es/m/[email protected]

Author: michaelpq

src/backend/access/heap/vacuumlazy.c

@@ -1148,10 +1148,11 @@ heap_vacuum_rel(Relation rel, const VacuumParams params,
 							 total_blks_read,
 							 total_blks_dirtied);
 			appendStringInfo(&buf,
-							 _("WAL usage: %" PRId64 " records, %" PRId64 " full page images, %" PRIu64 " bytes, %" PRId64 " buffers full\n"),
+							 _("WAL usage: %" PRId64 " records, %" PRId64 " full page images, %" PRIu64 " bytes, %" PRIu64 " full page image bytes, %" PRId64 " buffers full\n"),
 							 walusage.wal_records,
 							 walusage.wal_fpi,
 							 walusage.wal_bytes,
+							 walusage.wal_fpi_bytes,
 							 walusage.wal_buffers_full);
 			appendStringInfo(&buf, _("system usage: %s"), pg_rusage_show(&ru0));
 

src/backend/commands/analyze.c

@@ -831,10 +831,11 @@ do_analyze_rel(Relation onerel, const VacuumParams params,
 							 total_blks_read,
 							 total_blks_dirtied);
 			appendStringInfo(&buf,
-							 _("WAL usage: %" PRId64 " records, %" PRId64 " full page images, %" PRIu64 " bytes, %" PRId64 " buffers full\n"),
+							 _("WAL usage: %" PRId64 " records, %" PRId64 " full page images, %" PRIu64 " bytes, %" PRIu64 " full page image bytes, %" PRId64 " buffers full\n"),
 							 walusage.wal_records,
 							 walusage.wal_fpi,
 							 walusage.wal_bytes,
+							 walusage.wal_fpi_bytes,
 							 walusage.wal_buffers_full);
 			appendStringInfo(&buf, _("system usage: %s"), pg_rusage_show(&ru0));