Stripe's usage of "lurking" is a bit idiosyncratic. (There are a couple of other words like this, distributed in a glossary, the majority of which is less idios

Stripe's usage of "lurking" is a bit idiosyncratic. (There are a couple of other words like this, distributed in a glossary, the majority of which is less idiosyncratic word usage and more industry- or company-specific jargon.) In the sense used here, "Lurking into someone's thread" means sending an unsolicited comment to a thread you were not an expected participant on. This is something we're broadly supportive of but which, if done poorly, can be socially contentious. You could imagine pathologically bad examples like "Hey thanks for working on this project for the last 8 months, but before you ship it, just wondered if we had considered adding a teal bikeshed? Taking the liberty of CCing seven people for their thoughts on the bikeshed you'll be building."