Where can we find the official (mathematical) definitions for the keys in the websocket ticks?

How is average_price defined? Is it for that snapshot, or average through the day till that point?

Scouting around, I found this code snippet which helps how "change" is defined: https://gist.github.com/ajinasokan/b36d17da1a58af62782978c16bca309a#file-ticker-js-L530

tick.change = (tick.last_price - tick.ohlc.close) * 100 / tick.ohlc.close

Can buy_quantity/ sell_quantity decrease? (would depend on how it is computed)

The definitions https://kite.trade/docs/connect/v3/websocket/#quote-packet-structure are a bit confusing since some of the params are clearly snapshots (measured at that instant), and some others are across that day (till that tick). A few are ambiguous.

It would help if is there a place where authoritative info about how it is computed/ calculated, is made available about the definitions.