Document log_transaction_sample_rate as superuser-only

The docs do say which GUCs can be changed only by superusers, but we
forgot to mention this for the new log_transaction_sample_rate. This
GUC was introduced in PostgreSQL 12, so backpatch accordingly.

Author: Adrien Nayrat
Backpatch-through: 12

diff --git a/doc/src/sgml/config.sgml b/doc/src/sgml/config.sgml
index 0bb00011464f979165e7e22118502206c0e9aae3..c2124393d076b7535e4d30693224d68731e028ef 100644 (file)
--- a/doc/src/sgml/config.sgml
+++ b/doc/src/sgml/config.sgml
@@ -5988,6 +5988,7 @@ local0.*    /var/log/postgresql
          logs all statements for all transactions.
          log_transaction_sample_rate is helpful to track a
          sample of transaction.
+         Only superusers can change this setting.