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The post-upgrade script in pmos-base isn't symlinked to the post-install script, so zram-init wasn't being enabled on systems that upgraded to the pmos-base version that intro'd this feature. I think this should have been enabled by default on upgraded systems. There's a deviceinfo toggle for it, so users who won't want to use this can set that var to disable it, in that case having the service enabled is basically a no-op.
(cc @pabloyoyoista)