Add trace origin

[ribice]

Resolves #668

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 87.50000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 82.11%. Comparing base (77f9517) to head (0cfd1ef).

Files	Patch %	Lines
tracing.go	77.77%	1 Missing and 1 partial :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #849      +/-   ##
==========================================
+ Coverage   82.05%   82.11%   +0.06%     
==========================================
  Files          51       51              
  Lines        4507     4518      +11     
==========================================
+ Hits         3698     3710      +12     
+ Misses        661      660       -1     
  Partials      148      148              

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[cleptric]

LGTM, anything else you want to add here?

[ribice]

LGTM, anything else you want to add here?

No, just haven't had the chance to test it e2e.

[ribice]

These are visible in spans. Ready for review/merge now.