How do I restore missing menu extras (clock, wi-fi, etc)?

When I log in to Mac OS X (10.10.5) I sometimes find that most of my menu extras are missing (clock, wi-fi, sound, bluetooth, etc.). If I logout and login, they almost always come back, but this takes too much time.

I suspect the problem is caused by menumeters but I find this menulet too useful to uninstall it.

How can I reset my menu extras (aka menulets) without logging out?

I was able to get my menu extras back without logging out by running killall SystemUIServer in the Terminal.app.

I found the answer from zane's Recover missing menubar icons - revisited System post. The post is from 2006, but the trick still works on Yosemite.