chore: prepare monitoring config via globals

hosts/sire/guests/influxdb.nix

@@ -29,6 +29,17 @@ in {
 
   meta.telegraf.secrets."@GITHUB_ACCESS_TOKEN@" = config.age.secrets.github-access-token.path;
   services.telegraf.extraConfig.outputs.influxdb_v2.urls = lib.mkForce ["http://localhost:${toString influxdbPort}"];
+
+  globals.monitoring.ping.cloudflare-dns = {
+    host = "1.1.1.1";
+    location = "external";
+  };
+
+  globals.monitoring.ping.google-dns = {
+    host = "8.8.8.8";
+    location = "external";
+  };
+
   services.telegraf.extraConfig.inputs = {
     ping = [
       {

modules/globals.nix

@@ -98,10 +98,14 @@ in {
             ping = mkOption {
               type = types.attrsOf (types.submodule {
                 options = {
-                  fromNetwork = mkOption {
+                  host = mkOption {
                     type = types.str;
-                    description = "The network from which this service is reachable.";
+                    description = "The IP/hostname to ping.";
-                    default = "external";
+                  };
+
+                  location = mkOption {
+                    type = types.str;
+                    description = "A location tag added to this metric.";
                   };
                 };
               });

nix/globals.nix

@@ -26,7 +26,7 @@
     in {
       # Make sure the keys of this attrset are trivially evaluatable to avoid infinite recursion,
       # therefore we inherit relevant attributes from the config.
-      inherit (globalsSystem.config.globals) net services;
+      inherit (globalsSystem.config.globals) net services monitoring;
     };
   };
 }