resources for prometheus mqtt exporter

apps/mosquitto-prometheus-exporter/live.hcl

@@ -33,6 +33,10 @@ job "mosquitto-prometheus-exporter" {
             "--endpoint", "tcp://mqtt.wks:1883"
         ]
       }
+      resources {
+        cpu    = 50
+        memory = 10
+      }
     }
   }
 }