chore(otel): document otel api limitations

[mabdinur]

Resolves: #6882

What does this PR do?

Updates OpenTelemetry documentation to clearly warn users that dd-trace-js and their application must use the same instance of @opentelemetry/api and @opentelemetry/api-logs modules.

Motivation

Users installing different versions of @opentelemetry/api (e.g., v1.9.0) can end up with multiple copies in node_modules, causing module duplication. This breaks OpenTelemetry's singleton pattern, resulting in spans becoming no-ops with all-zero trace IDs and opentelemetry logs not being submitted.

This documentation update serves as an alternative to converting these packages to peer dependencies. It makes users aware of the requirement to use the same module instance as dd-trace-js.

Additional Notes

• Added concise warnings to both OpenTelemetry API and Logs sections
• Explains the consequence: spans become no-ops with all-zero trace IDs
• No code changes, documentation only

[github-actions]

Overall package size

Self size: 13.23 MB
Deduped: 116.14 MB
No deduping: 131.16 MB

Dependency sizes

| name | version | self size | total size | |------|---------|-----------|------------| | @datadog/libdatadog | 0.7.0 | 35.02 MB | 35.02 MB | | @datadog/native-appsec | 10.3.0 | 20.73 MB | 20.74 MB | | @datadog/native-iast-taint-tracking | 4.0.0 | 11.72 MB | 11.73 MB | | @datadog/pprof | 5.12.0 | 11.19 MB | 11.57 MB | | @opentelemetry/resources | 1.30.1 | 557.67 kB | 7.71 MB | | @opentelemetry/core | 1.30.1 | 908.66 kB | 7.16 MB | | protobufjs | 7.5.4 | 2.95 MB | 5.82 MB | | @datadog/wasm-js-rewriter | 5.0.1 | 2.82 MB | 3.55 MB | | @datadog/native-metrics | 3.1.1 | 1.02 MB | 1.43 MB | | @opentelemetry/api-logs | 0.208.0 | 199.48 kB | 1.42 MB | | @opentelemetry/api | 1.9.0 | 1.22 MB | 1.22 MB | | jsonpath-plus | 10.3.0 | 617.18 kB | 1.08 MB | | import-in-the-middle | 1.15.0 | 127.66 kB | 856.24 kB | | lru-cache | 10.4.3 | 804.3 kB | 804.3 kB | | @datadog/openfeature-node-server | 0.1.0-preview.15 | 106.53 kB | 424.55 kB | | opentracing | 0.14.7 | 194.81 kB | 194.81 kB | | source-map | 0.7.6 | 185.63 kB | 185.63 kB | | pprof-format | 2.2.1 | 163.06 kB | 163.06 kB | | @datadog/sketches-js | 2.1.1 | 109.9 kB | 109.9 kB | | @isaacs/ttlcache | 2.1.1 | 90.58 kB | 90.58 kB | | lodash.sortby | 4.7.0 | 75.76 kB | 75.76 kB | | ignore | 7.0.5 | 63.38 kB | 63.38 kB | | istanbul-lib-coverage | 3.2.2 | 34.37 kB | 34.37 kB | | rfdc | 1.4.1 | 27.15 kB | 27.15 kB | | dc-polyfill | 0.1.10 | 26.73 kB | 26.73 kB | | tlhunter-sorted-set | 0.1.0 | 24.94 kB | 24.94 kB | | shell-quote | 1.8.3 | 23.74 kB | 23.74 kB | | limiter | 1.1.5 | 23.17 kB | 23.17 kB | | retry | 0.13.1 | 18.85 kB | 18.85 kB | | semifies | 1.0.0 | 15.84 kB | 15.84 kB | | jest-docblock | 29.7.0 | 8.99 kB | 12.76 kB | | crypto-randomuuid | 1.0.0 | 11.18 kB | 11.18 kB | | ttl-set | 1.0.0 | 4.61 kB | 9.69 kB | | mutexify | 1.4.0 | 5.71 kB | 8.74 kB | | path-to-regexp | 0.1.12 | 6.6 kB | 6.6 kB | | module-details-from-path | 1.0.4 | 3.96 kB | 3.96 kB | | escape-string-regexp | 5.0.0 | 3.66 kB | 3.66 kB |

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

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.84%. Comparing base (b4d004d) to head (a925fef).
⚠️ Report is 10 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #6915   +/-   ##
=======================================
  Coverage   83.84%   83.84%           
=======================================
  Files         506      506           
  Lines       21374    21374           
=======================================
  Hits        17922    17922           
  Misses       3452     3452           

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[BridgeAR]

While that 'solves' the problem, it is not what is recommended by otel: https://github.com/open-telemetry/opentelemetry-js-contrib/blob/main/GUIDELINES.md#opentelemetry-api

Instead, we have to change these to peer dependencies and lazy load the module, when it is not needed.