Definition. The number of "yes" votes cast by the validator committee attesting to the validity of the block produced in each slot.

Technical. Each epoch, up to 64 committees of at least 128 validators are algorithmically selected per slot for block production and attestation. For each slot, one validator from the committee is selected to propose a block, while the remaining committee members are responsible for casting attestation votes.

This is the Point-in-Time (PiT) variant of Attestation Count. PiT metrics are strictly append-only and their history is immutable. The historic data does not necessarily reflect the best current knowledge, but the information at the time when a data point was first computed. PiT metrics are ideal candidates for applications in model backtesting and related quantitative purposes. Read our article on PiT metrics for more information.