Added debug logging by sending heartbeats.

systemd_notifier.rb

@@ -11,8 +11,10 @@ class SystemdNotifier
     MethodExecutor.record("error", "heartbeat", "NOTIFY_SOCKET is not set or is not a socket, am I a service?")
     @enable_heartbeat = false
   else
+    MethodExecutor.record("debug", "heartbeat", "Found NOTIFY_SOCKET, enabling heartbeat")
     @enable_heartbeat = true
     @socket = UNIXSocket.new(@notify_socket)
+    MethodExecutor.record("debug", "heartbeat", "Heartbeat socket opened")
   end
 
   def enabled?
@@ -24,6 +26,7 @@ class SystemdNotifier
 
     begin
       @socket.send(message, 0)
+      MethodExecutor.record("debug", "heartbeat", "Heartbeat sent: #{message}")
     rescue => e
       MethodExecutor.error("heartbeat", "Failed to send heartbeat: #{e}")
       @enable_heartbeat = false