Kinesis- Firehose data when redeploying

Hi, I am deploying my node.js code on lambda on AWS with serverless framework.
My code uses Kinesis-Firehose to store data in S3.
I was wondering if each time I’m deploying my code with “serverless deploy”, the events appearing during the deployment are managed.
Indeed, firehose store buffered data in S3 so i am wondering if some events data are loose in the process.

For now, Firehose delivery stream is not created with serverless.yml