The ornamental design for an inhalermonitoringattachment, as shown and described.
FIG. 1 is a front, top, and left side perspective view of an inhaler monitoring attachment;
FIG. 2 is a front elevation view thereof;
FIG. 3 is a rear elevation view thereof;
FIG. 4 is a top plan view thereof;
FIG. 5 is a left side elevation view thereof; and,
FIG. 6 is a right side elevation view thereof.
The broken line showing of the inhaler depicts environmental structure and forms no part of the claimed design. All other broken lines depict portions of the inhaler attachment for an inhaler that form no part of the claimed design.