[FLINK-32560] Properly deprecate all Scala APIs

• Type: Sub-task
• Status: Closed
• Priority: Major
• Resolution: Done
• Fix Version/s: 1.18.0
• Component/s: API / Scala
• Labels: pull-request-available
• Assignee: Ryan Skraba
• Reporter: Xintong Song
• Created: 07/Jul/23 08:44
• Updated: 03/Aug/23 02:10
• Resolved: 03/Aug/23 02:10

Description

We agreed to drop Scala API support in FLIP-265 [1], and have tried to deprecate them in FLINK-29740. Also, both user documentation and roadmap[2] shows that scala API supports are deprecated. However, none of the APIs in `flink-streaming-scala` are annotated with `@Deprecated` atm, and only `ExecutionEnvironment` and `package` are marked `@Deprecated` in `flink-scala`.

[1] https://cwiki.apache.org/confluence/display/FLINK/FLIP-265+Deprecate+and+remove+Scala+API+support
[2] https://flink.apache.org/roadmap/

Issue Links

• relates to: FLINK-29740 [FLIP-265] Deprecate all customer-facing Scala APIs
• links to: GitHub Pull Request #23006