Germane

How is that question germane to what we're discussing?

What you're saying is interesting but hardly germane to the topic at hand.

1924, W. D. Ross., translator, Aristotle, Metaphysics. Nashotah, Wisconsin, USA: The Classical Library, 2001, Book 1, Part 5. Yet this much is germane to the present inquiry:

Connors was addicted to this racquet and kept using it even after Wilson stopped making it, forfeiting millions in potential endorsement money by doing so. Connors was eccentric (and kind of repulsive) in lots of other ways, too, none of which are germane to this article.

Valentine’s Day means different things for different people. [...] Most germane to the episode, for Lisa, Valentine’s Day means being the only person in her entire class to give Ralph a Valentine after noticing him looking crestfallen and alone at his desk.