Replace manual.keep tag usage with an specific method to keep the trace

[iunanua]

What does this PR do?

• Incorporate the new PrioritySampler.setPriority(span, samplingPriority, mechanism) method to allow to set an span priority directly.
• Replace the usage of manual.keep tag in appsec and iast modules with the PrioritySampler.keepTrace() method.

Motivation

Modules like appsec and iast use manual.keep tag when they want to indicate the tracer to keep the trace.
But this is not entirely correct because some times priority has been set on the creation of the trace and adding manual.keep tag has no effect in the trace's priority.

Plugin Checklist

• Unit tests.
• TypeScript definitions.
• TypeScript tests.
• API documentation.
• CircleCI jobs/workflows.
• Plugin is exported.

Additional Notes

[github-actions]

Overall package size

Self size: 7.61 MB
Deduped: 64.47 MB
No deduping: 64.81 MB

Dependency sizes

| name | version | self size | total size | |------|---------|-----------|------------| | @datadog/native-appsec | 8.2.1 | 19.18 MB | 19.19 MB | | @datadog/native-iast-taint-tracking | 3.2.0 | 13.9 MB | 13.91 MB | | @datadog/pprof | 5.4.1 | 9.76 MB | 10.13 MB | | protobufjs | 7.2.5 | 2.77 MB | 5.16 MB | | @datadog/native-iast-rewriter | 2.5.0 | 2.51 MB | 2.65 MB | | @opentelemetry/core | 1.14.0 | 872.87 kB | 1.47 MB | | @datadog/native-metrics | 2.0.0 | 898.77 kB | 1.3 MB | | @opentelemetry/api | 1.8.0 | 1.21 MB | 1.21 MB | | import-in-the-middle | 1.11.2 | 112.74 kB | 826.22 kB | | msgpack-lite | 0.1.26 | 201.16 kB | 281.59 kB | | opentracing | 0.14.7 | 194.81 kB | 194.81 kB | | lru-cache | 7.18.3 | 133.92 kB | 133.92 kB | | pprof-format | 2.1.0 | 111.69 kB | 111.69 kB | | @datadog/sketches-js | 2.1.0 | 109.9 kB | 109.9 kB | | semver | 7.6.3 | 95.82 kB | 95.82 kB | | lodash.sortby | 4.7.0 | 75.76 kB | 75.76 kB | | ignore | 5.3.1 | 51.46 kB | 51.46 kB | | int64-buffer | 0.1.10 | 49.18 kB | 49.18 kB | | shell-quote | 1.8.1 | 44.96 kB | 44.96 kB | | istanbul-lib-coverage | 3.2.0 | 29.34 kB | 29.34 kB | | rfdc | 1.3.1 | 25.21 kB | 25.21 kB | | tlhunter-sorted-set | 0.1.0 | 24.94 kB | 24.94 kB | | limiter | 1.1.5 | 23.17 kB | 23.17 kB | | dc-polyfill | 0.1.4 | 23.1 kB | 23.1 kB | | retry | 0.13.1 | 18.85 kB | 18.85 kB | | jest-docblock | 29.7.0 | 8.99 kB | 12.76 kB | | crypto-randomuuid | 1.0.0 | 11.18 kB | 11.18 kB | | koalas | 1.0.2 | 6.47 kB | 6.47 kB | | path-to-regexp | 0.1.10 | 6.38 kB | 6.38 kB | | module-details-from-path | 1.0.3 | 4.47 kB | 4.47 kB |

_{🤖 This report was automatically generated by heaviest-objects-in-the-universe}

[pr-commenter]

Benchmarks

Benchmark execution time: 2024-10-25 13:46:31

Comparing candidate commit 822d3ac in PR branch igor/set-sampling-priority with baseline commit f62cbfa in branch master.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 258 metrics, 8 unstable metrics.

[codecov]

Codecov Report

Attention: Patch coverage is 94.11765% with 1 line in your changes missing coverage. Please review.

Project coverage is 80.11%. Comparing base (7f93d36) to head (bfa5ae1).
Report is 42 commits behind head on master.

Files with missing lines	Patch %	Lines
packages/dd-trace/src/priority_sampler.js	85.71%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #4739       +/-   ##
===========================================
+ Coverage   69.19%   80.11%   +10.92%     
===========================================
  Files           1      288      +287     
  Lines         198    12835    +12637     
  Branches       33        0       -33     
===========================================
+ Hits          137    10283    +10146     
- Misses         61     2552     +2491     

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