I'd like to propose graduating a couple of features out of 'experimental' status in 0.14. Both are popular features (judging by mailing list & github issue/PR activity). Both have been around for a while and have attained a good level of quality and stability of API & behavior. I believe removing the 'experimental' banner from these features would more accurately reflect reality, and be a good signal to the user community.
1) Kafka indexing service. First introduced in Druid 0.9.1, it went through a major protocol change in Druid 0.12.0 that added incremental publishing, & 'mixing' of data from different partitions. Subjectively, quality appears to be getting more solid, based on frequency of bug reports and also based on our own experiences running this in production. Finally- I believe it is already much more robust than Tranquility, the only 'stable' alternative. 2) Druid SQL. First introduced in Druid 0.10.0. It isn't feature complete yet (multi-value dimensions, datasketches, etc, remain unsupported) but the API and behavior have been generally stable. No major issues around memory / performance / etc regressions relative to native Druid queries are outstanding. IMO, it is well on its way to becoming a first class way to query Druid, and it is a good time to remove the 'experimental' banner.
