gnus-add-timestamp-to-message

gnus-add-timestamp-to-message is a variable defined in `gnus-util.el'.
Its value is

nil

Documentation:
Non-nil means add timestamps to messages that Gnus issues.
If it is `log', add timestamps to only the messages that go into the
"*Messages*" buffer (in XEmacs, it is the " *Message-Log*" buffer).
If it is neither nil nor `log', add timestamps not only to log messages
but also to the ones displayed in the echo area.

You can customize this variable.

This variable was introduced, or its default value was changed, in version 23.1 of Emacs.