Fix trace sampler 1.8

[grcevski]

Backport of #1240

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.10%. Comparing base (3339917) to head (14f5fc7).

Additional details and impacted files

@@               Coverage Diff               @@
##           release-1.8    #1241      +/-   ##
===============================================
+ Coverage        82.06%   82.10%   +0.03%     
===============================================
  Files              140      140              
  Lines            11590    11604      +14     
===============================================
+ Hits              9511     9527      +16     
  Misses            1555     1555              
+ Partials           524      522       -2     

Flag	Coverage Δ
integration-test	57.92% <76.92%> (+0.01%)	⬆️
k8s-integration-test	59.21% <69.23%> (+0.06%)	⬆️
oats-test	37.09% <69.23%> (+0.11%)	⬆️
unittests	52.31% <84.61%> (+0.04%)	⬆️

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