internal(prof): configurable upload compression

[morrisonlevi]

Description

This adds support for DD_PROFILING_UPLOAD_COMPRESSION. It has 4 values:

• off
• on
• lz4
• zstd

"on" is the default, and aliases one of the other forms of compression. This is not expected to be used by end-users, but rather development and testing and benchmarking cost trade-offs. Specifically, we're testing out zstd.

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 79.26%. Comparing base (0f03e1a) to head (4d78bf7).

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #3259      +/-   ##
============================================
+ Coverage     76.35%   79.26%   +2.90%     
  Complexity     2948     2948              
============================================
  Files           145      118      -27     
  Lines         16082    11633    -4449     
  Branches       1110        0    -1110     
============================================
- Hits          12280     9221    -3059     
+ Misses         3225     2412     -813     
+ Partials        577        0     -577     

Flag	Coverage Δ
appsec-extension	?
tracer-php	79.26% <ø> (-0.02%)	⬇️

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see 28 files with indirect coverage changes

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[pr-commenter]

Benchmarks [ profiler ]

Benchmark execution time: 2025-05-21 16:40:22

Comparing candidate commit 4d78bf7 in PR branch PROF-11833-Support-DD_PROFILING_UPLOAD_COMPRESSION-in-PHP with baseline commit 0f03e1a in branch master.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 29 metrics, 7 unstable metrics.