Flume SDK info?

Hi,

I recently noticed somebody (Ashish, I believe) mentioning Flume SDK.
Never heard of it before. Googled, but really only found this:
https://flume.apache.org/FlumeDeveloperGuide.html#client-sdk

Is there any other info/documentation available about this anywhere?

What's the main use case for this? If there are no Flume sinks or sources
for one's data stores or end-points, then one can use Flume's data
transport mechanism by sending data to Flume via RPC... is that the main
idea?

Thanks,
Otis