Now zero-based.
Reported-by: David Rowley
Discussion: https://postgr.es/m/CAApHDvqMfTBdfwc0Z-tHXLnBMKJLYEZDApgUzA7x_PUDZsY3GA@mail.gmail.com
-Change pg_backend_memory_contexts.level to be one-based (Melih Mutlu)
+Change pg_backend_memory_contexts.level and pg_log_backend_memory_contexts()() to be one-based (Melih Mutlu, Fujii Masao)
-It was previously zero-based.
+These were previously zero-based.