feat(profiler) add exception message to exception sample

[realFlowControl]

Description

This will add the exception message to the sample that is taken. You'd need to opt-in to the collection of exception messages by setting the environment variable DD_PROFILING_EXCEPTION_MESSAGE_ENABLED or the INI setting datadog.profiling.exception_message_enabled to true/1/on.

Additionally I moved reading the exception class name (and the message) to after the sampling decision which lowers the overhead of exception profiling.

PROF-8838

Reviewer checklist

• Backend and UI support is implemented
• Test coverage seems ok.
• Appropriate labels assigned.

[pr-commenter]

Benchmarks

Benchmark execution time: 2024-02-19 11:14:01

Comparing candidate commit 486661c in PR branch florian/exception-message with baseline commit 7da29d0 in branch master.

Some scenarios are present only in baseline or only in candidate runs. If you didn't create or remove some scenarios in your branch, this maybe a sign of crashed benchmarks 💥💥💥
Check Gitlab CI job log to find if any benchmark has crashed.

Scenarios present only in baseline:

• BM_TeaSapiSpindown
• BM_TeaSapiSpinup

Found 0 performance improvements and 0 performance regressions! Performance is the same for 42 metrics, 50 unstable metrics.

[morrisonlevi]

Are there any concerns about gathering the exception message? Any filtering or anything that needs done? I wonder if APM does anything.

[realFlowControl]

@morrisonlevi I added an option to disable the collection of messages for exceptions. It is default enabled

[codecov-commenter]

Codecov Report

Merging #2434 (486661c) into master (7da29d0) will decrease coverage by 0.02%.
The diff coverage is 25.00%.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #2434      +/-   ##
============================================
- Coverage     76.67%   76.65%   -0.02%     
  Complexity      267      267              
============================================
  Files           136      136              
  Lines         17627    17629       +2     
  Branches       1034     1034              
============================================
- Hits          13515    13514       -1     
- Misses         3575     3578       +3     
  Partials        537      537              

Flag	Coverage Δ
appsec-extension	70.24% <ø> (ø)
tracer-extension	78.61% <25.00%> (-0.03%)	⬇️
tracer-integrations	79.49% <ø> (ø)

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

Files	Coverage Δ
zend_abstract_interface/symbols/lookup.c	82.58% <25.00%> (-1.34%)	⬇️

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[realFlowControl]

@morrisonlevi I am btw. open to set this default disabled

[bwoebi]

Looks good to me now :-)