Send spans_created telemetry metric

[iamluc]

Description

spans_created is the first telemetry metric collected as part of https://datadoghq.atlassian.net/browse/AIT-4125

Reviewer checklist

• Test coverage seems ok.
• Appropriate labels assigned.

[pr-commenter]

Benchmarks

Benchmark execution time: 2024-03-28 19:40:07

Comparing candidate commit c21845b in PR branch lv/tracer-telemetry with baseline commit 8e98f4d in branch master.

Found 13 performance improvements and 1 performance regressions! Performance is the same for 168 metrics, 0 unstable metrics.

scenario:EmptyFileBench/benchEmptyFileOverhead

• 🟩 execution_time [-358.485µs; -242.955µs] or [-10.390%; -7.042%]

scenario:EmptyFileBench/benchEmptyFileOverhead-opcache

• 🟩 execution_time [-366.606µs; -262.774µs] or [-10.264%; -7.357%]

scenario:HookBench/benchWithoutHook-opcache

• 🟩 execution_time [-3.433µs; -2.166µs] or [-6.642%; -4.191%]

scenario:LaravelBench/benchLaravelOverhead

• 🟩 execution_time [-339.723µs; -227.077µs] or [-9.513%; -6.358%]

scenario:LaravelBench/benchLaravelOverhead-opcache

• 🟩 execution_time [-395.047µs; -246.493µs] or [-10.603%; -6.616%]

scenario:SpanBench/benchDatadogAPI-opcache

• 🟥 execution_time [+409.560ns; +686.440ns] or [+2.364%; +3.961%]

scenario:SymfonyBench/benchSymfonyBaseline

• 🟩 execution_time [-337.620µs; -294.860µs] or [-5.689%; -4.968%]

scenario:SymfonyBench/benchSymfonyBaseline-opcache

• 🟩 execution_time [-336.061µs; -237.539µs] or [-5.543%; -3.918%]

scenario:SymfonyBench/benchSymfonyOverhead

• 🟩 execution_time [-707.544µs; -651.096µs] or [-9.097%; -8.371%]

scenario:SymfonyBench/benchSymfonyOverhead-opcache

• 🟩 execution_time [-722.734µs; -655.226µs] or [-9.139%; -8.286%]

scenario:WordPressBench/benchEnhancedWordPressOverhead

• 🟩 execution_time [-6.490ms; -4.706ms] or [-3.060%; -2.219%]

scenario:WordPressBench/benchEnhancedWordPressOverhead-opcache

• 🟩 execution_time [-7.327ms; -6.103ms] or [-3.437%; -2.863%]

scenario:WordPressBench/benchWordPressOverhead

• 🟩 execution_time [-10.208ms; -8.083ms] or [-4.747%; -3.759%]

scenario:WordPressBench/benchWordPressOverhead-opcache

• 🟩 execution_time [-9.867ms; -7.866ms] or [-4.574%; -3.646%]

[codecov-commenter]

Codecov Report

Merging #2577 (2a269e0) into master (8e98f4d) will increase coverage by 0.04%.
Report is 1 commits behind head on master.
The diff coverage is 98.18%.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #2577      +/-   ##
============================================
+ Coverage     75.47%   75.52%   +0.04%     
  Complexity     2603     2603              
============================================
  Files           242      242              
  Lines         27225    27276      +51     
  Branches        985      985              
============================================
+ Hits          20549    20599      +50     
- Misses         6151     6152       +1     
  Partials        525      525              

Flag	Coverage Δ
appsec-extension	69.01% <ø> (ø)
tracer-extension	78.71% <97.61%> (+0.06%)	⬆️
tracer-php	74.08% <100.00%> (+0.02%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
ext/ddtrace.c	73.31% <100.00%> (+0.18%)	⬆️
ext/ddtrace.h	62.50% <ø> (ø)
ext/ddtrace_arginfo.h	100.00% <100.00%> (ø)
ext/span.c	93.01% <100.00%> (+0.01%)	⬆️
ext/span.h	100.00% <ø> (ø)
src/DDTrace/OpenTelemetry/Span.php	85.71% <100.00%> (+0.07%)	⬆️
src/DDTrace/OpenTracer/Tracer.php	86.88% <100.00%> (+0.92%)	⬆️
src/DDTrace/OpenTracer1/Tracer.php	86.66% <100.00%> (+0.95%)	⬆️
ext/telemetry.c	98.82% <96.55%> (-1.18%)	⬇️

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[bwoebi]

LGTM :-)