nixos-module/collectd: install additional TypesDB

nix/nixos-module/collectd.nix

@@ -3,12 +3,19 @@
 let
   hostRole = config.site.hosts.${hostName}.role;
   networkPort = 25826;
+  typesDb = builtins.toFile "types.db" ''
+    stations                value:GAUGE:0:U
+  '';
 in
 {
   services.collectd = {
     enable = true;
     buildMinimalPackage = true;
 
+    extraConfig = ''
+      TypesDB ${config.services.collectd.package}/share/collectd/types.db ${typesDb}
+    '';
+
     plugins = lib.mkMerge [ {
       interface = "";
       conntrack = "";