Cost optimisation for Kinesis Firehose

One option is to make sure the Buffer Interval is cranked up to the max of 900 seconds. That gives firehose longer to buffer the records together into larger objects. If the source of the data is direct Puts, you definitely want to use PutRecordBatch to send in several records. If the source is machines with the kinesis log agent you can increase the maxBufferAgeMillis to increase how long the client buffers data before sending it to firehose, the trade off being the amount of data lost if something happens to the host.