robertwb commented on pull request #14490:
URL: https://github.com/apache/beam/pull/14490#issuecomment-828836493


   I'm wondering about the value of attaching startTime to each metric. It 
seems to add a lot of complexity and is a bit ill-defined in the Beam model. 
Are these tied somehow to process-wide metrics? If so, could we just use the 
start time of the process itself when publishing these rather than adding the 
overhead of tracking it per-metric? 


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