Commits on Oct 7, 2022

1. usage reporting: fix memory leak …

   A data structure in the usage reporting plugin would get a new entry
   each time the server's schema changed. Old entries would never be
   deleted, though their values would be shrunk to a minimum size.
   
   It seems that this was not good enough and is producing notable memory
   leaks for some folks. So let's fix it!
   
   The reason for the old behavior was to be really careful to never write
   to a report that may have already been taken out of the map and sent.
   Previously this was accomplished by having the main entry in the map
   never change. Now this is accomplished by making sure that we never
   write to the report any later than immediately (and synchronously) after
   we pull it out of the map.
   
   Fixes #6983.

   

   glasser committed Oct 7, 2022
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