Posts on Pinterest are monitored for the following metrics. 

Save: The number of times your pin was saved to a board.

Pin click: The number of clicks on your pin.

Outbound click: The number of times users click on a destination URL in your pin that will take them away from Pinterest.

Impression: The number of times your pin was displayed on the screen.

Video average watch time: The average time the video included in your pin was played.

Video watch time: The total time the video included in your pin was played.

Quartile 95% view: The number of times the video in your pin was played to 95% of its length or more. This also includes if the video was skipped to that point.