Github user bowenli86 commented on the issue:
https://github.com/apache/flink/pull/5236
@aljoscha @StephanEwen This metadata of timers helps users to understand
their timer usage and write logic in code to handle it. I think it's really
helpful and convenient to provide the data out-of-box. As you said, it can be
expensive and can also be implemented as valuestate or something else by users.
I'm fine to drop it---
