FYI, SRE has re-imaged bast1002.wikimedia.org.  This means that if you use this as your ssh bastion, you will get a warning about SSH key change. 
If the key being offered you is the one in https://wikitech.wikimedia.org/wiki/Help:SSH_Fingerprints/bast1002.wikimedia.org, you can accept the new key.

---------- Forwarded message ---------
From: Moritz Mühlenhoff <mmuhlenhoff@wikimedia.org>
Date: Wed, Feb 24, 2021 at 4:44 AM
Subject: Re: [Ops] Reimage of bast1002 tomorrow
To: Operations Engineers <ops@lists.wikimedia.org>


On Tue, Feb 23, 2021 at 11:25 AM Moritz Mühlenhoff
<mmuhlenhoff@wikimedia.org> wrote:
> I'm going to reimage bast1002 for an OS update to Buster tomorrow
> during the early European morning. Please use a different bastion
> during that time.

This is complete, you can use bast1002.wikimedia.org again.

You can fetch the updated fingerprint by running the
wmf-update-known-hosts-production script, or as a fallback updated
fingerprints are also at
https://wikitech.wikimedia.org/wiki/Help:SSH_Fingerprints/bast1002.wikimedia.org.

Cheers,
Moritz

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