Set it to, say, 80, to have a ruler drawn in the 80th column, i.e., in the console, type view.options().set(‘rulers’, ‘80’). It’s handy if you’re trying to keep to an n character limit.
It’s not like the indentation indicators in the screenshot you linked to, though I expect that’s just rendering tab characters so that they look like vertical rulers: you can turn on visible whitespace in sublime, but it’s not drawn the same way.