Hi Peter, long story short: AFAICT it's a deprecated or moved configuration entry inside the file /etc/machine-info and should be safe to just delete, maybe even with the whole file machine-info itself.
On my machine with openrc and systemd-boot I don't even have /etc/machine-info at all and things work fine together. To me it looks as the variable was just thrown out of the machine-info file and in case you would need it you should put it into /etc/kernel/install.conf. I don't know which software uses the string. If you compile your kernel manually or using the gentoo-kernel packages it seems to be not necessary. (But as always when taking advice from strangers on the internet: First make a backup, have a live medium for recovery at hand and test it yourself.) Kind regards, Nils
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