feat: implement website alerting plan with Blackbox Exporter and VictoriaMetrics integration

hosts/web-arm/configuration.nix

@@ -1,4 +1,4 @@
-{ lib, pkgs, ... }: {
+{ config, lib, pkgs, ... }: {
   imports = [
     ./utils/bento.nix
     ./utils/modules/sops.nix
@@ -17,12 +17,12 @@
     ./modules/grafana/default.nix
     ./modules/loki.nix
     ./modules/victoriametrics.nix
+    ./modules/blackbox-exporter.nix
     ./modules/updns.nix
 
     ./utils/modules/autoupgrade.nix
     ./utils/modules/promtail
     ./utils/modules/borgbackup.nix
-    ./utils/modules/netdata.nix
     ./modules/set-nix-channel.nix # Automatically manage nix-channel from /var/bento/channel
 
     ./hardware-configuration.nix