[7.x] Configuration for dropping non-sampled transactions (#3702)

[axw]

Backports the following commits to 7.x:

• Configuration for dropping non-sampled transactions (Configuration for dropping non-sampled transactions #3702)

[codecov-io]

Codecov Report

Merging #3742 into 7.x will decrease coverage by 0.03%.
The diff coverage is 74.19%.

@@            Coverage Diff             @@
##              7.x    #3742      +/-   ##
==========================================
- Coverage   79.78%   79.75%   -0.04%     
==========================================
  Files         132      134       +2     
  Lines        6080     6110      +30     
==========================================
+ Hits         4851     4873      +22     
- Misses       1229     1237       +8     

Impacted Files	Coverage Δ
beater/config/config.go	67.21% <14.28%> (-6.87%)	⬇️
beater/beater.go	70.00% <50.00%> (-0.95%)	⬇️
beater/config/sampling.go	100.00% <100.00%> (ø)
sampling/sampling.go	100.00% <100.00%> (ø)

[ghost]

💚 Build Succeeded

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Build stats

• Build Cause: [Pull request [7.x] Configuration for dropping non-sampled transactions (#3702) #3742 opened]

• Start Time: 2020-05-05T03:44:07.660+0000

• Duration: 27 min 36 sec (1596013)

• Commit: 6a27580

Test stats 🧪

Test	Results
Failed	0
Passed	3005
Skipped	142
Total	3147

Steps errors

Expand to view the steps failures

• Name: Test Sync

  • Description: ./script/jenkins/sync.sh

  • Result: FAILURE

  • Duration: 3 min 55 sec<

  • Start Time: 2020-05-05T03:53:52.588+0000

[simitt]

Tested that only sampled transactions are recorded and a warning is logged, in case aggregation is not configured but unsampled transactions are dropped.