[apmbench] Add trace only benchmarks

[carsonip]

Motivation/summary

Existing benchmarks are a mix of logs, metrics and traces (sampled and unsampled transactions). Using these benchmarks will introduce noise in benchmark results to assess TBS performance. It will create strange results where the slower the disk, the higher the throughput, because traces ingestion slows and ingestion of other events speeds up to take up the CPU time spared by slow disk, making benchmark results very hard to interpret.

Create a special benchmark with only sampled traces to accurately benchmark traces. Benchmark files are obtained by e.g. grep -E '^{"span|^{"transaction|^{"meta' apm-nodejs-3.29.0.ndjson > apm-nodejs-traces-3.29.0.ndjson

We may want to revert this in the future to add these files to upstream apm-perf and bump apm-server to use upstream apm-perf e.g. #15379 . It is currently using a very old apm-perf.

Checklist

• Update CHANGELOG.asciidoc
• Documentation has been updated

For functional changes, consider:

• Is it observable through the addition of either logging or metrics?
• Is its use being published in telemetry to enable product improvement?
• Have system tests been added to avoid regression?

How to test these changes

Related issues

Useful to benchmark #15235 and related TBS optimizations

[mergify]

This pull request does not have a backport label. Could you fix it @carsonip? 🙏
To fixup this pull request, you need to add the backport labels for the needed
branches, such as:

• backport-7.17 is the label to automatically backport to the 7.17 branch.
• backport-8./d is the label to automatically backport to the 8./d branch. /d is the digit.
• backport-8.x is the label to automatically backport to the 8.x branch.

[mergify]

backport-8.x has been added to help with the transition to the new branch 8.x.
If you don't need it please use backport-skip label.

[carsonip]

@Mergifyio backport 9.0 8.x 8.18

[mergify]

backport 9.0 8.x 8.18

✅ Backports have been created

• #15601 [apmbench] Add trace only benchmarks (backport #15434) has been created for branch 9.0
• #15602 [apmbench] Add trace only benchmarks (backport #15434) has been created for branch 8.x
• #15603 [apmbench] Add trace only benchmarks (backport #15434) has been created for branch 8.18