release: Release 2 items

[otelbot-ruby]

This pull request prepares new releases for the following components:

• opentelemetry-exporter-otlp-metrics 0.10.0 (was 0.9.1)
• opentelemetry-metrics-sdk 0.15.0 (was 0.14.0)

For each releasable component, this pull request modifies the version and provides an initial changelog entry based on conventional commit messages. You can edit these changes before merging, to release a different version or to alter the changelog text.

• To confirm this release, merge this pull request, ensuring the "release: pending" label is set. The release script will trigger automatically on merge.
• To abort this release, close this pull request without merging.

The generated changelog entries have been copied below:

---

opentelemetry-exporter-otlp-metrics

• BREAKING CHANGE: Metrics cardinality limit (feat(metrics-sdk)!: Metrics cardinality limit #1909)
• ADDED: Metrics cardinality limit (feat(metrics-sdk)!: Metrics cardinality limit #1909)

---

opentelemetry-metrics-sdk

• BREAKING CHANGE: Metrics cardinality limit (feat(metrics-sdk)!: Metrics cardinality limit #1909)
• ADDED: Metrics cardinality limit (feat(metrics-sdk)!: Metrics cardinality limit #1909)

---

# release_metadata DO NOT REMOVE OR MODIFY
{
  "requested_components": {
    "opentelemetry-api": null,
    "opentelemetry-registry": null,
    "opentelemetry-sdk": null,
    "opentelemetry-sdk-experimental": null,
    "opentelemetry-common": null,
    "opentelemetry-exporter-otlp": null,
    "opentelemetry-exporter-otlp-logs": null,
    "opentelemetry-exporter-otlp-metrics": null,
    "opentelemetry-exporter-zipkin": null,
    "opentelemetry-propagator-b3": null,
    "opentelemetry-propagator-jaeger": null,
    "opentelemetry-semantic_conventions": null,
    "opentelemetry-test-helpers": null,
    "opentelemetry-metrics-api": null,
    "opentelemetry-metrics-sdk": null,
    "opentelemetry-logs-api": null,
    "opentelemetry-logs-sdk": null
  },
  "request_sha": "08cb185c97420e0a07031ab192490c56764f3662"
}

[github-actions]

Starting release automation. See https://github.com/open-telemetry/opentelemetry-ruby/actions/runs/27634358937 for execution logs.

[github-actions]

Release job results

• Job started 2026-06-16 17:00:38 UTC
• Job finished 2026-06-16 17:01:06 UTC
• Release SHA: cbcdaf5
• Release pull request: release: Release 2 items #2198
• All releases completed successfully.
• Run logs: https://github.com/open-telemetry/opentelemetry-ruby/actions/runs/27634358937

opentelemetry-exporter-otlp-metrics 0.10.0

• Created release with tag opentelemetry-exporter-otlp-metrics/v0.10.0 on GitHub.
• Rubygems push for opentelemetry-exporter-otlp-metrics 0.10.0.

opentelemetry-metrics-sdk 0.15.0

• Created release with tag opentelemetry-metrics-sdk/v0.15.0 on GitHub.
• Rubygems push for opentelemetry-metrics-sdk 0.15.0.