log for high offroad memory usage

selfdrive/thermald/thermald.py

@@ -244,6 +244,9 @@ def thermald_thread():
     msg.deviceState.batteryVoltage = HARDWARE.get_battery_voltage()
     msg.deviceState.usbOnline = HARDWARE.get_usb_present()
 
+    if EON and started_ts is not None and msg.deviceState.memoryUsagePercent > 40:
+      cloudlog.warning("High offroad memory usage", mem=msg.deviceState.memoryUsagePercent)
+
     # Fake battery levels on uno for frame
     if (not EON) or is_uno:
       msg.deviceState.batteryPercent = 100