Hi all,

For the upcoming 0.17.0 release, I'm wondering if this would be a good time
to officially declare Tranquility as deprecated/sunsetted in the release
notes.

This was discussed a few times in the past, such as:
https://lists.apache.org/thread.html/476fdd5b6c681854df38bc78e5fae11d3fa371345e1924694ea6be4a%40%3Cdev.druid.apache.org%3E

Tranquility hasn't had any updates and no on seems interested in
maintaining it, it's been de-emphasized in the docs, and I think the reply
from Gian in that thread gives a good breakdown of the rationale for
favoring Kafka ingestion instead:

> We should include some rationale as to why that
decision was made, too. To me the rationale boils down to: KIS style
ingestion doesn't have a windowPeriod restriction, doesn't lose data when
tasks fail, is lower footprint when reading from an external stream hub
like Kafka/Kinesis, and has generally proven to be easier to set up and
debug.

Any thoughts?

Best,
Jon

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