Thank you Marc.
When I have leading dot, we are facing issues with schema confluent schema registry integration.
1. We register schema without leading dot.
2. Confluent Schema registry uses the descriptor data to look up schema def for a given protobuf message since descriptorData has extra dot, it is throwing schema not found exception.
Workaround for now looks like: add leading dot in the schema definition as well so that schema def and descriptor data both will have the dot. Not sure whether this is the right solution or not, but seems to be working for now.