In commit e6080a38 (Wed Mar 19 00:29:36 2014) I renamed this from "debug stats record start|stop"
Unfortunately, I didn't do this fully so before this commit "stats record start|stop" will report a usage failure with the old debug text.
Unfortunately this is in the 0.8 release. The workaround is to repeat the last command twice (e.g. "stats record start start")