An embodiment of monitoring resource usage in a computing environment begins with a first client registering a session with a monitoring entity. The shroud may be released from the balloon. The breathing hole has a cover side opening, which connects to an accommodation side opening of the communication passage. The toner amount restricting plate restricts the amount of toner adhered to the surface of the rubbing roller. A judgment signal input circuit logically combines comparison results of divided voltages of the above output voltages Vif, Vcp, Vup and Vsb with a divided voltage of the output voltage Vad as a reference voltage, and inputs relative voltage information ER2, ER3, ER4 and ER5 to a microprocessor. Each of said optical resonators is configured to resonantly couple to the optical waveguide at a different optical frequency.