Current day of year in redaction salt

[KalleOlaviNiemitalo]

eca8bd0 mentions:

The salt is derived from the name of the item being redacted, and can optionally include the current day of the year (which induces daily rotation).

and there is a JustInTimeRedactor.MaxDayOfYearLength constant that is added to the buffer size:

extensions/src/Libraries/Microsoft.Extensions.Telemetry/Logging/JustInTimeRedactor.cs

Line 98 in 7d9d589

int maxLenToRedact = charsInWorkBuffer + DiscriminatorSeparator.Length + _discriminator.Length + MaxDayOfYearLength;

But where is the code that adds the day of year to the salt?