Revert "release: remove metrics from unstable channel (temporarily)"
Revert "release: remove metrics from unstable channel (temporarily)"

This reverts commit 96d73edaf33f4c9ee452f65504bfdfab9a653eaa.
IPv6 connectivity restored by ISP a few hours after I pushed
the workaround.  Apparently it was something complicated;
I suppose that has to do with the issue appearing on Friday 13th
during full moon ;-)

NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs