before this change, the format string contains two placeholders,
but only one extra argument is passed in. if we actually format
this logging message, fmtlib would throw.
after this change, we pass the exception's error message as yet
another argument.
this logging message is printed with "trace" level, guess that's
why we haven't have the exception thrown by fmtlib.
Signed-off-by: Kefu Chai <kefu.chai@scylladb.com>
Closes#14628
5443bf69f7