MX304 NPU Utilization sensor (resource path /junos/system/linecard/npu/utilization).

The sensors are only valid for PTX and QFX dont see these sensors for Mx304 in the pathfinder.

NPU Utilization for PTX10000 and QFX1000 Series Table 8

https://www.juniper.net/documentation/us/en/software/junos/interfaces-telemetry/interfaces-telemetry.pdf