Standalone ASM priority sampler and tag propagation

[iunanua]

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What does this PR do?

Continuation of https://github.com/DataDog/dd-trace-js/pull/4291

Defines two new channels in opentracing/propagation/text_map.js in order to alter trace propagation:

• dd-trace:span:inject which publishes the trace span context and the carrier that is going to be injected in a downstream req
• dd-trace:span:extract which publishes the trace span context and the carrier when a span is going to be extracted from an upstream req.

When standalone ASM is enabled it:

• replaces default PrioritySampler with StandaloneAsmPrioritySampler via DatadogTracer constructor.
  • StandaloneAsmPrioritySampler searches for _dd.p.appsec in the tags in order to keep a trace, sets a 1 req/min rate limiter and disables user rules.
• when injecting a trace and if the trace doesn't contain _dd.p.appsec tag, removes x-datadog- and datadog info from tracestate
• when extracting a trace if the trace doesn't contain _dd.p.appsec tag, resets the sampling priority.
• disables span stats and includes 'Datadog-Client-Computed-Stats': 'yes' header when exporting traces to the agent to pretend stats computation is made by the tracer

ST PR to enable Standalone ASM tests

Motivation

Support Standalone ASM billing

Plugin Checklist

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

Additional Notes

[github-actions[bot]]

Overall package size

Self size: 6.82 MB Deduped: 62.08 MB No deduping: 62.36 MB

Dependency sizes

name	version	self size	total size
@datadog/native-appsec	8.0.1	15.59 MB	15.6 MB
@datadog/native-iast-taint-tracking	2.1.0	14.91 MB	14.92 MB
@datadog/pprof	5.3.0	9.85 MB	10.22 MB
protobufjs	7.2.5	2.77 MB	6.56 MB
@datadog/native-iast-rewriter	2.3.1	2.15 MB	2.24 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	1.8.1	71.67 kB	741.34 kB
msgpack-lite	0.1.26	201.16 kB	281.59 kB
opentracing	0.14.7	194.81 kB	194.81 kB
semver	7.5.4	93.4 kB	123.8 kB
pprof-format	2.1.0	111.69 kB	111.69 kB
@datadog/sketches-js	2.1.0	109.9 kB	109.9 kB
lodash.sortby	4.7.0	75.76 kB	75.76 kB
lru-cache	7.14.0	74.95 kB	74.95 kB
ignore	5.2.4	51.22 kB	51.22 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
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
path-to-regexp	0.1.7	6.78 kB	6.78 kB
koalas	1.0.2	6.47 kB	6.47 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[bot]]

Benchmarks

Benchmark execution time: 2024-07-03 07:58:28

Comparing candidate commit 61f7b11672d0e08186c1c7040ba6f50a08a322e7 in PR branch igor/standalone-asm-priority-sampler-channel with baseline commit 2c1367b1ae4944030cc182c9a920e2f128cbb1a1 in branch master.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 260 metrics, 6 unstable metrics.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 96.87500% with 2 lines in your changes missing coverage. Please review.

Project coverage is 87.61%. Comparing base (b1f1f85) to head (81700d0). Report is 28 commits behind head on master.

:exclamation: Current head 81700d0 differs from pull request most recent head f615a16

Please upload reports for the commit f615a16 to get more accurate results.

Files	Patch %	Lines
...s/dd-trace/src/opentracing/propagation/text_map.js	71.42%	2 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4416      +/-   ##
==========================================
- Coverage   92.64%   87.61%   -5.04%     
==========================================
  Files         116      249     +133     
  Lines        4173    10767    +6594     
  Branches       33       33              
==========================================
+ Hits         3866     9433    +5567     
- Misses        307     1334    +1027     

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