Peer service mapping

[jbertran]

What does this PR do?

Expose DD_TRACE_PEER_SERVICE_MAPPING, which behaves like DD_SERVICE_MAPPING, but for the peer.service tag.

If the mapping is matched, the original value is reported in _dd.peer.service.remapped_from.

Motivation

Plugin Checklist

• Unit tests.

Additional Notes

[github-actions]

Overall package size

Self size: 4.8 MB
Deduped: 57.79 MB
No deduping: 57.88 MB

Dependency sizes

name	version	self size	total size
@datadog/native-iast-taint-tracking	1.5.0	14.86 MB	14.86 MB
@datadog/native-appsec	3.2.0	13.38 MB	13.39 MB
@datadog/pprof	3.0.0	10.54 MB	11.39 MB
protobufjs	7.2.4	2.74 MB	6.52 MB
@datadog/native-iast-rewriter	2.0.1	2.09 MB	2.1 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	1.4.1	780.32 kB	780.32 kB
msgpack-lite	0.1.26	201.16 kB	281.59 kB
opentracing	0.14.7	194.81 kB	194.81 kB
semver	7.5.3	93.39 kB	123.79 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
ipaddr.js	2.0.1	59.52 kB	59.52 kB
int64-buffer	0.1.10	49.18 kB	49.18 kB
ignore	5.2.0	48.87 kB	48.87 kB
import-in-the-middle	1.3.5	34.34 kB	38.81 kB
istanbul-lib-coverage	3.2.0	29.34 kB	29.34 kB
retry	0.10.1	27.44 kB	27.44 kB
lodash.uniq	4.5.0	25.01 kB	25.01 kB
limiter	1.1.5	23.17 kB	23.17 kB
lodash.kebabcase	4.1.1	17.75 kB	17.75 kB
lodash.pick	4.4.0	16.33 kB	16.33 kB
node-abort-controller	3.0.1	14.33 kB	14.33 kB
crypto-randomuuid	1.0.0	11.18 kB	11.18 kB
diagnostics_channel	1.1.0	7.07 kB	7.07 kB
path-to-regexp	0.1.7	6.78 kB	6.78 kB
koalas	1.0.2	6.47 kB	6.47 kB
methods	1.1.2	5.29 kB	5.29 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: 2023-07-10 14:47:18

Comparing candidate commit 4a99565 in PR branch jbertran/peer-service-remapping with baseline commit d00a4e0 in branch master.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 469 metrics, 23 unstable metrics.

[codecov]

Codecov Report

Merging #3320 (4a99565) into master (d00a4e0) will increase coverage by 0.09%.
The diff coverage is 85.71%.

@@            Coverage Diff             @@
##           master    #3320      +/-   ##
==========================================
+ Coverage   84.11%   84.21%   +0.09%     
==========================================
  Files         204      204              
  Lines        8015     8020       +5     
  Branches       33       33              
==========================================
+ Hits         6742     6754      +12     
+ Misses       1273     1266       -7     

Impacted Files	Coverage Δ
packages/dd-trace/src/constants.js	100.00% <ø> (ø)
packages/dd-trace/src/plugins/outbound.js	72.41% <80.00%> (+25.98%)	⬆️
packages/dd-trace/src/config.js	99.09% <100.00%> (+0.01%)	⬆️
packages/dd-trace/src/opentracing/tracer.js	98.52% <100.00%> (+0.02%)	⬆️

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[tlhunter]

Can you also add this new environment variable to the documentation repo:
https://github.com/DataDog/documentation/blob/master/content/en/tracing/trace_collection/library_config/nodejs.md

Is this variable a standard across tracers? Such as Python?