See Execution Status

Click the right menu "Execution status monitor" of "Monitor" tab, all pipeline execution status can be seen on displayed screen.

Sensor action	Display execution number of sensor actions.
Filter action	Display execution number of filter actions.
Joint action	Display execution number of joint actions.
Filter action execution waiting	Display number of items to wait for processing displayed in the queue between sensor and filter.
Joint action execution waiting	Display number of items to wait for processing displayed in the queue between filter and joint.