Please post your tag synonym suggestions as new answers in this thread, one answer per suggestion. Upvote answers where you believe that the suggested tags should be made synonyms, and downvote answers where you believe the tags should remain separate. Well upvoted suggestions will be eventually implemented by the moderators (and then the corresponding answers will be deleted).
As a piece of software,
xgboost is just one (popular) boosting library. However, it's not the only boosting software; we do not have tags for other individual boosting libraries like
light-gbm, for instance.
stats.SE is not primarily oriented to debugging issues with statistical software, so it can be confusing to have tags for individual libraries as opposed to the underlying statistical procedures that those libraries implement.
The specific implementation choices that
xgboost makes naturally have statistical and computational consequences, and it can be reasonable to ask about them, but I'm not sure we need to dedicate a tag for this boosting implementation (or, in general, every boosting implementation).