je-ik commented on issue #23379:
URL: https://github.com/apache/beam/issues/23379#issuecomment-1263841450

   We are able to observe input watermark via timers. The input watermark has 
to be there in the ProcessContext, because event timer with 
`timer.setRelative().offset(0)` needs to know the value of input watermark. It 
is questionable if this should not be the output watermark, but currently we 
use the input one. If the watermark is already present, I think we could make 
it available. If we are afraid of users misusing it, then we are maybe talking 
more about the API, then the fact, it already is available, although in a 
somewhat obfuscated way. But I agree this deserves broader discussion.


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