On Fri, Dec 03, 2021 at 11:52:58AM -0800, Elijah Newren wrote:

Are there some rather large delays in mailing list delivery these
days?  Anyone know who to contact to investigate?  [*]

The right person to contact is postmaster@vger.kernel.org, however I can
actually answer your question (despite not actually being in charge of
vger.kernel.org). Periodically, Gmail decides that there's just too much
incoming mail for some accounts and will arbitrarily delay delivery by
returning a "this account is receiving too much mail, please try later."

I am willing to bet that this is what happened to you.

Best regards,
-K