The Ethereum PoS protocol allows for the movement of validators both into, and out of the validating network. On both entrance and exit, there is a queue system which regulates changes in the number of validators per epoch, to assure smooth network operation. The churn limit per Epoch defined as:

Epoch Churn Limit = max(4, Active_Validators/65536)

With these parameters, and 6.4-min Epochs, the expected daily validator churn limit will range from a minimum of 900/day, to a maximum of 3,600/day.

This workbench metric displays the observed daily net change in Active Validators, as well as the daily validator churn limit cap.