Remove revisions for 1386, PPC64EL and S390X

I keep getting messages that my snaps (guitarfinetune and timedatecalculator) contains outdated Ubuntu packages. That is for old revisions and for architectures that can’t be build (i386, ppc64el and s390x (the snap uses extensions: [gnome-3-38] and base: core20)).

How do I remove old revisions and architectures that can’t be build from Releases ?

You can close the channel, and then re-push newer builds of specific architecture, another way is to omit those architectures from snapcraft yaml i.e, dont build them if you are still building it, if not do the first one, close all channels and then only push the newer builds with the preferred architecture