I just uploaded cloud-init 20.4 to unstable. It'll be included in the nightly sid cloud image builds that we publish in the next day or so. If you can, please try launching one of them in whatever cloud environment you can, with whatever bits of userdata configuration you can throw at them. File bug reports as appropriate. It's somewhat likely that this is the upstream version of cloud-init that gets shipped with bullseye, so finding out early if something is wrong with it will save pain later. Thanks noah
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