add back probing

[vchuravy]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 6 lines in your changes missing coverage. Please review.

Project coverage is 71.64%. Comparing base (de1bed2) to head (a9ae5e9).
Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
src/UCX.jl	0.00%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #29      +/-   ##
==========================================
- Coverage   72.09%   71.64%   -0.45%     
==========================================
  Files           4        4              
  Lines         971      977       +6     
==========================================
  Hits          700      700              
- Misses        271      277       +6     

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