diff -w -U3 C:/cirrus/src/test/regress/expected/guc.out C:/cirrus/build/testrun/pg_upgrade/002_pg_upgrade/data/results/guc.out
--- C:/cirrus/src/test/regress/expected/guc.out	2024-03-08 16:06:49.321554800 +0000
+++ C:/cirrus/build/testrun/pg_upgrade/002_pg_upgrade/data/results/guc.out	2024-03-08 16:10:18.363920100 +0000
@@ -850,8 +850,9 @@
   WHERE category = 'Developer Options' AND NOT not_in_sample
   ORDER BY 1;
  name 
-------
-(0 rows)
+-------------------------------
+ backtrace_functions_min_level
+(1 row)
 
 -- Most query-tuning GUCs are flagged as valid for EXPLAIN.
 -- default_statistics_target is an exception.