The The median length for the field values analyzed is over 400 characters. warning which is displayed in the anomaly detection categorization is probably unnecessary and can give the user the wrong idea that the categorization job will fail if their messages are too long.

This warning was added because of the 1000 character limit in the AD c++ process for creating example messages to accompany the anomalies.
Strings longer than 1000 characters will be truncated, but this is just effecting the examples and not the actual categorization or anomaly detection.