Propagated sampling rates

[solnic]

This ensures that we follow the spec as described here https://develop.sentry.dev/sdk/telemetry/traces/#propagated-random-value

[codecov]

Codecov Report

❌ Patch coverage is 98.92473% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 97.44%. Comparing base (dd8b418) to head (db7da2e).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
sentry-ruby/lib/sentry/utils/sample_rand.rb	98.07%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2671      +/-   ##
==========================================
+ Coverage   97.39%   97.44%   +0.04%     
==========================================
  Files         135      136       +1     
  Lines        5229     5315      +86     
==========================================
+ Hits         5093     5179      +86     
  Misses        136      136              

Components	Coverage Δ
sentry-ruby	97.76% <98.92%> (+0.02%)	⬆️
sentry-rails	96.10% <ø> (+0.14%)	⬆️
sentry-sidekiq	96.57% <ø> (ø)
sentry-resque	94.44% <ø> (ø)
sentry-delayed_job	94.68% <ø> (ø)
sentry-opentelemetry	99.31% <ø> (ø)

Files with missing lines	Coverage Δ
sentry-ruby/lib/sentry-ruby.rb	99.14% <100.00%> (+<0.01%)	⬆️
sentry-ruby/lib/sentry/hub.rb	97.93% <ø> (ø)
sentry-ruby/lib/sentry/propagation_context.rb	97.40% <100.00%> (+0.91%)	⬆️
sentry-ruby/lib/sentry/transaction.rb	98.22% <100.00%> (+0.14%)	⬆️
sentry-ruby/lib/sentry/utils/sample_rand.rb	98.07% <98.07%> (ø)

... and 1 file with indirect coverage changes

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[sl0thentr0py]

logic looks perfect, nice work!

if we can avoid deduplication it would be great, but maybe I missed a reason why transaction needs its own logic. We will remove Transaction.from_sentry_trace completely in the major either way.

[sl0thentr0py]

some suggestions for the specs

[sl0thentr0py]

sorry if I'm blind but where are we using this method?

[solnic]

ugh sorry about that, messed up rebasing and unused methods kept reappearing, it's removed now :)

[sl0thentr0py]

right, but then I wanted us to check the incoming request headers too by actually using this method, not removing it..

anyway it's just a spec so don't care that much, feel free to add it or not

[solnic]

@sl0thentr0py OK added expectations for proper headers and stuff via db7da2e