rohitsinha54 commented on PR #34363:
URL: https://github.com/apache/beam/pull/34363#issuecomment-2764132011

   Sorry for the late reply. This is not an urgent change (i.e. not essential 
for 2.64 release hence not actively following this on my time off).
   
   This will only be triggered if the metric result contains bounded trie. So 
for 2.64 this would not happen unless a customer specifically opt-in to track 
lineage with boundedtrie or uses boundedtrie metrics (undocumented) in any 
other way. For the StringSet it happened in that way because lineage emission 
is enabled by default and was being tracked as StringSet and hence querying 
/metric for any metric results in StringSet being in result. 
   
   Yes, we can change it to do something else other than empty values. I will 
work on that. We will need this as a safeguard before we switch to bounded trie 
as default metric type for lineage tracking. 


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