InterpolatedIv
InterpolatedIv is the implied volatility and expected move calculated for a fixed horizon expressed in days. If a horizon lines up with a real option expiry the value is taken from an exact matching expiry (is_exact = true) and otherwise interpolated between the two surrounding expiries (is_exact = false). The interpolation is not linear in implied volatility. It is done in total variance space (volatility^2 * time): the surrounding terms are converted to total variance, then interpolated linearly there and then via the square root rooted back to an implied volatility. The message itself does not carry the ticker: the Kafka message key is the ticker of the underlying.
