WIP: otel metrics

[rachelyangdog]

Description

Reviewer checklist

• Test coverage seems ok.
• Appropriate labels assigned.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 62.15%. Comparing base (1fa51af) to head (2b43c21).
⚠️ Report is 27 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3460      +/-   ##
==========================================
- Coverage   62.19%   62.15%   -0.04%     
==========================================
  Files         141      141              
  Lines       12622    12622              
  Branches     1650     1650              
==========================================
- Hits         7850     7845       -5     
- Misses       4045     4050       +5     
  Partials      727      727              

see 2 files with indirect coverage changes

---

Continue to review full report in Codecov by Sentry.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 1fa51af...2b43c21. Read the comment docs.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[pr-commenter]

Benchmarks [ tracer ]

Benchmark execution time: 2025-11-04 21:51:07

Comparing candidate commit 06ac1e0 in PR branch rachel.yang/otel-metrics-part1 with baseline commit 1fa51af in branch master.

Found 3 performance improvements and 4 performance regressions! Performance is the same for 186 metrics, 1 unstable metrics.

scenario:EmptyFileBench/benchEmptyFileDdprof-opcache

• 🟥 execution_time [+173.529µs; +341.791µs] or [+4.725%; +9.306%]

scenario:LogsInjectionBench/benchLogsInfoBaseline-opcache

• 🟩 execution_time [-80.937ns; -55.863ns] or [-4.512%; -3.114%]

scenario:MessagePackSerializationBench/benchMessagePackSerialization

• 🟥 execution_time [+6.178µs; +7.602µs] or [+5.867%; +7.218%]

scenario:MessagePackSerializationBench/benchMessagePackSerialization-opcache

• 🟥 execution_time [+3.875µs; +5.365µs] or [+3.666%; +5.075%]

scenario:SamplingRuleMatchingBench/benchGlobMatching1-opcache

• 🟩 execution_time [-173.301ns; -55.899ns] or [-7.250%; -2.338%]

scenario:SymfonyBench/benchSymfonyDdprof-opcache

• 🟥 execution_time [+193.087µs; +298.953µs] or [+2.281%; +3.532%]

scenario:TraceSerializationBench/benchSerializeTrace

• 🟩 execution_time [-30.369µs; -17.131µs] or [-6.908%; -3.897%]

[rachelyangdog]

Closed in favor of #3487