base.go
func (b *Base) Fatalm(m *Attrs, msg string, a ...interface{}) error {
	return b.Log(LevelFatal, m, msg, a...)
}
func (b *Base) Fatalm(m *Attrs, msg string, a ...interface{}) error {
	return b.Log(LevelFatal, m, msg, a...)
}
/*
Fatalm uses msg as a format string with subsequent parameters as values and logs
the resulting message to all added loggers at LogLevel.LevelFatal. It will also
merge all attributes passed in m with any attributes added to Base and include them
with the message if the Logger supports it.
*/