Add log message when dashboard connected to proxy

artiq/dashboard/moninj.py

@@ -660,6 +660,8 @@ class _DeviceManager:
                 await asyncio.sleep(10.)
                 self.reconnect_mi.set()
             else:
+                logger.info("ARTIQ dashboard connected to moninj proxy (%s)",
+                            self.mi_addr)
                 self.mi_connection = new_mi_connection
                 for ttl_channel in self.ttl_widgets.keys():
                     self.setup_ttl_monitoring(True, ttl_channel)