OTel SDK

[Qard]

What does this PR do?

Adds OpenTelemetry support to the tracer.

Motivation

We want a smooth way for users to integrate OpenTelemetry systems with dd-trace.

[codecov]

Codecov Report

Merging #2498 (02b475c) into master (f0c974a) will increase coverage by 0.17%.
The diff coverage is 91.09%.

@@            Coverage Diff             @@
##           master    #2498      +/-   ##
==========================================
+ Coverage   85.72%   85.89%   +0.17%     
==========================================
  Files         182      189       +7     
  Lines        7229     7416     +187     
  Branches       33       33              
==========================================
+ Hits         6197     6370     +173     
- Misses       1032     1046      +14     

Impacted Files	Coverage Δ
packages/dd-trace/src/proxy.js	97.72% <0.00%> (-2.28%)	⬇️
...ages/dd-trace/src/opentelemetry/context_manager.js	84.61% <84.61%> (ø)
packages/dd-trace/src/opentelemetry/tracer.js	85.71% <85.71%> (ø)
packages/dd-trace/src/opentelemetry/span.js	92.15% <92.15%> (ø)
...kages/dd-trace/src/opentelemetry/span_processor.js	92.30% <92.30%> (ø)
...ages/dd-trace/src/opentelemetry/tracer_provider.js	96.66% <96.66%> (ø)
packages/dd-trace/src/opentelemetry/sampler.js	100.00% <100.00%> (ø)
...ackages/dd-trace/src/opentelemetry/span_context.js	100.00% <100.00%> (ø)
packages/dd-trace/src/opentracing/span.js	76.76% <100.00%> (+1.49%)	⬆️

... and 2 files with indirect coverage changes

📣 We’re building smart automated test selection to slash your CI/CD build times. Learn more

[pr-commenter]

Benchmarks

Comparing candidate commit 02b475c in PR branch otel-prototype with baseline commit f0c974a in branch master.

Found 1 performance improvements and 0 performance regressions! Performance is the same for 443 metrics, 28 unstable metrics.

scenario:startup-control-everything-18

• 🟩 max_rss_usage [-7.545KB; -7.195KB] or [-5.257%; -5.012%]

[github-actions]

Overall package size

Self size: 4.3 MB
Deduped: 60.71 MB
No deduping: 60.76 MB

Dependency sizes

name	version	self size	total size
@datadog/pprof	2.2.1	14.24 MB	15.12 MB
@datadog/native-iast-taint-tracking	1.4.1	14.85 MB	14.86 MB
@datadog/native-appsec	3.2.0	13.38 MB	13.39 MB
protobufjs	7.1.2	2.76 MB	6.55 MB
@datadog/native-iast-rewriter	2.0.1	2.09 MB	2.1 MB
@opentelemetry/core	1.10.1	843.35 kB	1.44 MB
@datadog/native-metrics	2.0.0	898.77 kB	1.3 MB
@opentelemetry/api	1.4.1	780.32 kB	780.32 kB
opentracing	0.14.7	194.81 kB	194.81 kB
semver	7.3.8	88.2 kB	118.6 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
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}

[Qard]

This is all working now and passing all the system tests here: DataDog/system-tests#1237

As far as I can tell the only remaining thing missing is telemetry, but that should be straightforward.

[bengl]

There's probably a way we could just link to OTel's API docs instead of including it directly here, but this should suffice for now.

[Qard]

typedoc would do that automatically, but I believe we turned that capability off to prevent OpenTracing from showing docs for features we didn't support. Which I suppose if we wanted to continue in that direction some of the docs for opentelemetry should be removed too as there are some interfaces we have to not break compatibility but are just no-ops currently.