Use SourceID when spread events

[vadimalekseev]

Fixes #515

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (1b30680) 67.82% compared to head (1384a01) 67.82%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #516   +/-   ##
=======================================
  Coverage   67.82%   67.82%           
=======================================
  Files         104      104           
  Lines       10690    10690           
=======================================
  Hits         7250     7250           
  Misses       2977     2977           
  Partials      463      463           

Files	Coverage Δ
pipeline/pipeline.go	61.12% <100.00%> (ø)

... and 3 files with indirect coverage changes

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