Sanitize is only trimming properties etc, but not message itself.
https://github.com/Microsoft/ApplicationInsights-Home/blob/master/EndpointSpecs/Schemas/Bond/ExceptionDetails.bond#L19
Also need to make sure everything is conforming to the schema above. At present ingestion is rejecting exception only if above 65K. As per schema it should be 32K. But the following doc says 10K.
https://github.com/Microsoft/azure-docs/blob/master/includes/application-insights-limits.md