Grafana: No phoning home

Seems this is opt-out:
https://github.com/NixOS/nixpkgs/blob/9d1350d9d56411b685ff3de5839ed6728b1bf808/nixos/modules/services/monitoring/grafana.nix#L576-L582

nixos/modules/monitoring/server/grafana.nix

@@ -38,6 +38,9 @@ in {
       port = 2342;
       addr = "127.0.0.1";
 
+      # No phoning home
+      analytics.reporting.enable = false;
+
       # All three are required to forego the user/pass prompt:
       auth.anonymous.enable = true;
       auth.anonymous.org_role = "Admin";