LGTM, but this is my 1st review, so maybe someone else can take a look as well: nixos/swap: add discardPolicy option by nessdoor · Pull Request #107728 · NixOS/nixpkgs · GitHub
Thanks! 
Simple version bump: rtl_433: 20.11 -> 21.05 by Mindavi · Pull Request #122780 · NixOS/nixpkgs · GitHub, approved by maintainer.
Hi, this has been reviewed, and all relevant checks have passed:
https://github.com/NixOS/nixpkgs/pull/108348
Adds brscan5 scanner driver and NixOS module. Has been reviewed, but there’s one commit I pushed afterwards that might warrant another look.
https://github.com/NixOS/nixpkgs/pull/123426
Can someone merge this PR for proper boot mount priority? It fixes an issue when using agenix and impermanence together and it has been thoroughly reviewed by myself and @dotlambda:
https://github.com/NixOS/nixpkgs/pull/86967
These have both been tested and looked over, and have been sitting around for quite a bit:
https://github.com/NixOS/nixpkgs/pull/123765
https://github.com/NixOS/nixpkgs/pull/124431
This has been sitting around for a while and has been tested/reviewed by a few folks now.
nixos/unbound: fix define-tag option by rissson · Pull Request #124799 · NixOS/nixpkgs · GitHub fixes quite a few issues with the unbound module.
These two:
https://github.com/NixOS/nixpkgs/pull/130320
https://github.com/NixOS/nixpkgs/pull/130289
The following GNOME-related backports are ready and would be nice to merge:
https://github.com/NixOS/nixpkgs/pull/125926
https://github.com/NixOS/nixpkgs/pull/125925
https://github.com/NixOS/nixpkgs/pull/125924
https://github.com/NixOS/nixpkgs/pull/125851
https://github.com/NixOS/nixpkgs/pull/125928
https://github.com/NixOS/nixpkgs/pull/125927
https://github.com/NixOS/nixpkgs/pull/126011
This change should fix completely broken native armv7l builds on 21.05 while not touching anything else:
https://github.com/NixOS/nixpkgs/pull/131554