Register a Kinesis enhanced fan-out consumer and manage per-shard dedicated throughput

Steps

1. Register the consumer: aws kinesis register-stream-consumer --stream-arn <arn> --consumer-name my-app; the API returns a ConsumerARN
2. Subscribe to a shard using SubscribeToShard with the ConsumerARN and a StartingPosition (TRIM_HORIZON, LATEST, AT_SEQUENCE_NUMBER, or AT_TIMESTAMP)
3. Read from the HTTP/2 event stream returned by SubscribeToShard; each shard delivers up to 2 MB/sec dedicated throughput to this consumer independent of other consumers on the same shard
4. Handle SubscribeToShard expiration: subscriptions auto-expire after 5 minutes; resubscribe using the sequence number of the last processed record as the next AT_SEQUENCE_NUMBER starting position
5. Deregister consumers you no longer use: aws kinesis deregister-stream-consumer --consumer-arn <arn> to free slot capacity
6. Monitor consumer read throughput with the GetRecords.IteratorAgeMilliseconds and SubscribeToShard.IteratorAgeMilliseconds CloudWatch metrics per shard