Add telegraf metrics for x509 certificates

common/fragments/grafana.nix

@@ -41,6 +41,14 @@
           ];
         }];
       }
+      {
+        job_name = "telegraf";
+        static_configs = [{
+          targets = [
+            config.services.telegraf.extraConfig.outputs.prometheus_client.listen
+          ];
+        }];
+      }
     ];
   };
 }

common/fragments/prometheus_exporters.nix

@@ -22,5 +22,19 @@
       };
     };
   };
+
+  services.telegraf = {
+    enable = true;
+    extraConfig = {
+      inputs.x509_cert = {
+        sources = [ "https://technogothic.net:443" ];
+        interval = "10m";
+      };
+      outputs.prometheus_client = {
+        listen = "localhost:9004";
+        metric_version = 2;
+      };
+    };
+  };
 }