I recently noticed the code-generation tag, which is a redundant with metagolf. I'd suggest that code-generation is a synonym of metagolf, but don't have the rep to do so.
Since there's only one question tagged code-generation, I'm tempted to just retag it. Is that the appropriate action? It seems strange to me that if somebody makes up a tag, others must get reputation in it to point out that it's redundant.