A new warning message started today when trying to update syncthing:
Warning: Skipping acquire of configured file ‘release/binary-amd64/Packages’ as repository ‘https://apt.syncthing.net syncthing InRelease’ doesn’t have the component ‘release’ (component misspelt in sources.list?)
followed by 8 more warnings for all packages… i386, i18n,… but same warning.
I’m guessing you set this up a good long while ago? We used to have a “release” channel, but we renamed it to “stable” in 2017. Replace release with stable in your APT sources.list and you should be better off.
True. That did the trick. Thanks!
Just came here to say the same thing - thanks for the explanation and solution.
FWIW: this only recently broke (today for me), but I suspect it will start hitting various people who have followed external guides for apt setups, like How to Install Syncthing on Ubuntu 22.04 | Atlantic.Net which is generally a better approach than the official https://apt.syncthing.net documentation, which suggests using deprecated apt functionality.
Please do file an update on apt-web/site/index.html at main · syncthing/apt-web · GitHub for whatever the deprecated stuff is. 
This seems to change every couple of years.
The guide you linked to seems to be based on how things were a decade ago (using --dearmor on the text format key instead of the .gpg version that exists, release instead of stable), probably lightly updated along the way.
fair point - will file something
From my knowledge, it’s the other way around: The guide you linked uses deprecated keyrings, while apt.s.n provides current best practice on how to manage signing keys.
Ah, my apologies in that case, I may well have conflated the error logs I was seeing this morning. I’ll try a clean install later and confirm what combination I was seeing