Convert histogram measurements to double before passing recording exemplar reservoir

[jack-berg]

Resolves #6010.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (c57ca65) 91.16% compared to head (ff5595a) 91.20%.
Report is 3 commits behind head on main.

❗ Current head ff5595a differs from pull request most recent head c40a4cb. Consider uploading reports for the commit c40a4cb to get more accurate results

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #6024      +/-   ##
============================================
+ Coverage     91.16%   91.20%   +0.04%     
- Complexity     5613     5621       +8     
============================================
  Files           616      617       +1     
  Lines         16564    16575      +11     
  Branches       1642     1642              
============================================
+ Hits          15101    15118      +17     
+ Misses         1013     1011       -2     
+ Partials        450      446       -4     

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