https://arstechnica.com/gadgets/2021/11/androids-november-security-patch-brings-pixel-6-fixes-ends-pixel-3-support/

The start of a new month means it's time for Google to roll out an Android security patch. November's patch is more notable than usual, thanks to some Pixel 6-specific bugfixes and the cutoff of the three-year-old Pixel 3 hardware.

This release also marks the death of the Pixel 3 in Google's support lineup. The Pixel 3 launched in October 2018 with one of the biggest display notches ever and a serious dearth of RAM, earning it a lukewarm reception and disappointing sales. While the phone survived long enough to get the big Android 12 update and the October 2021 security patch, October marked three years of updates, so the November security update won't be arriving on the Pixel 3.