Add exisitng Kisesis Stream as Data Source

[usman-zulfiqar]

Background

As of now in StreamAlert We don't have the option where we can add existing Kinesis streams as a data source. We can only add a new one. Trust me this is creating a big issue especially with organizations that already started on AWS like us. Not sure to what extent this will be prioritized but we are in serious need of this as we already integrated Streamalert with our setup.

We would highly appreciate a response and a sprint with an ETA in the best case so that we can expect this feature in the near future.
Thanks in advance

NOTE: Before filing this issue, please consider the following:

Have you tried pinging us on Slack?
https://streamalert.herokuapp.com/
Yes, i did

Are you on the latest version of StreamAlert?

Description

Steps to Reproduce

Desired Change

when we are creating a cluster in-stream alert we have the option only to add new Kinesis stream as input but mostly in production case we already have some running stream. So please add this in the new release of StreamAlert

High level overview of the desired change or outcome.