LineageOS is the most popular custom ROM by far, providing hundreds of Android devices a light, near-stock version of Android. LineageOS 18.1, which is based on Android 11, is the latest version of the ROM. But with Android 12 out for a while now, many fans are looking forward to the next iteration: LineageOS 19.0. While we still don’t know when the new builds based on Android 12 will arrive, the LineageOS team has now announced that they’re ending support for LineageOS 17.1.
In a Reddit post, the LineageOS team revealed that LineageOS 17.1, based on Android 10, has now reached retirement. That means new builds of LineageOS 17.1 won’t be developed moving forward. The team says they had to take this step because of the storage restrictions of their build servers.
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As per the announcement, the following devices are being dropped from the LineageOS 17.1 build roaster:

If you’re running LineageOS 17.1 on any of the above-mentioned devices, you can continue to use the ROM as it is but note that there won’t be any new updates. That means you will miss out on important security patches and other improvements. Your best bet is to upgrade to LineageOS 18.1, assuming it’s available for your device, or switch to another custom ROM which is in active development.
At the time, LineageOS 17.1 builds are still listed on the LineageOS download page. The team notes that builds and recoveries will eventually be removed from the website.
As for the Android 12 release, the team says they have started testing build systems to support LineageOS 19.0. However, no exact timeline has been provided for when the new version is officially coming out.
https://www.xda-developers.com/lineageos-17-support-dropped/