feat(otel): add support for scope metrics

[mabdinur]

What does this PR do?

Adds support for setting attributes on the instrumentation scope when creating meters via getMeter(). Attributes set at the meter level are included in the exported OTLP scope and apply to all metrics created by that meter.

Motivation

The OpenTelemetry specification supports setting attributes on the meter level (in addition to resource and individual metric levels). This was introduced in v1.13.0 of the opentelemetry spec. This allows users to avoid repeating attributes across multiple metric calls. While the OpenTelemetry JS API doesn't support this property (link), we're adding it to align with the spec and maintain compatibility with other SDKs.

This gap was detected by system tests.

Additional Notes

• The attributes parameter is optional: getMeter(name, version, { schema_url, attributes: {...} })
• Attributes are included in the exported OTLP scope metrics:

{
  "resourceMetrics": [
    {
      "resource": {"attributes": [{...}],
      "scopeMetrics": [
        {
          "scope": {"name": "app", "version": "", "schemaUrl": "",
            "attributes": [{"key": "username","value": { "stringValue": "test" }},{"key": "id", "value": { "intValue": 23 }}
            ],
          },
          "metrics": [
            {
              "name": "num.monkies",
              // ... metric data
            },
            {
              "name": "num.baboons",
              // ... metric data
            }
          ]
        }
      ]
    }
  ]
}

Plugin Checklist

• Unit tests.
• Integration tests.
• Benchmarks.
• TypeScript definitions.
• TypeScript tests.
• API documentation.
• CI jobs/workflows.

Additional Notes

[github-actions]

Overall package size

Self size: 13.62 MB
Deduped: 113.82 MB
No deduping: 128.83 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/pprof | 5.12.0 | 11.19 MB | 11.57 MB | | @datadog/native-iast-taint-tracking | 4.1.0 | 9.01 MB | 9.02 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 | 5.83 MB | | @datadog/wasm-js-rewriter | 5.0.1 | 2.82 MB | 3.53 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 | 0.2.0 | 118.51 kB | 437.19 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 | 2.1.3 | 90.79 kB | 90.79 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 84.80%. Comparing base (b95a717) to head (f69d4d4).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #7063   +/-   ##
=======================================
  Coverage   84.80%   84.80%           
=======================================
  Files         514      514           
  Lines       21987    21987           
=======================================
+ Hits        18645    18646    +1     
+ Misses       3342     3341    -1     

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