How Does a Large Deviation between Mark Price and Last Traded Price Trigger a Warning?
A large deviation between the mark price (fair value, derived from the oracle) and the last traded price (exchange spot price) suggests a potential market anomaly, illiquidity, or manipulation on that specific exchange. This deviation triggers a warning or a 'circuit breaker' to alert traders and prevent liquidations based on the potentially manipulated spot price.
The mark price is used as the safe reference point.