The first one is more popular than the latter two, so I went through all topics tagged with lsp or language-server and retagged them with languageserver. I suppose there’s more that could be done here, something like making the two tags, that are now empty, make them just alias the languageserver tag, so they couldn’t be applied directly any more.
Thanks so much for doing all that! We can set tags as aliases and the system will auto-rename them, I think. If you find more sets let us know and we can try it.