According to the [koala](/questions/tagged/koala "show questions tagged 'koala'") tag wiki it is targeting questions about the Ruby-on-Rails koala gem. It has 169 questions

So, the [koala-gem](/questions/tagged/koala-gem "show questions tagged 'koala-gem'") (it does not have a tag wiki) is exactly identical (it has 8 questions, of which most also use the [koala](/questions/tagged/koala "show questions tagged 'koala'") tag).

I therefore propose to make [koala-gem](/questions/tagged/koala-gem "show questions tagged 'koala-gem'") a synonym of [koala](/questions/tagged/koala "show questions tagged 'koala'")