fix(byoo): avoid duplicate metric subset labels

[kristinapathak]

TL;DR

Disable resource-to-telemetry conversion in the Prometheus-only BYOO metric-subset exporter so required BYOO metric labels have one source.

Additional Details

• The subset pipeline keeps resource cleanup and metrics_transform.
• metrics_transform injects required NVCF metadata from environment variables, including NCA, provider, instance, host, function/version, region or zone, origin, and task identifiers.
• Resource-to-telemetry conversion also copies application resource attributes into metric data points. Prometheus normalizes dotted resource names such as function.id to function_id, which collides with the transform-created label of the same name.
• The customer metrics pipeline is unchanged. The rendered metric-subset example and patch version are updated.

For the Reviewer

Review addMetricSubsetExporter and the metric-subset pipeline in src/compute-plane-services/byoo-otel-collector/internal/otelconfig/render.go.

For QA

• GOCACHE=/private/tmp/byoo-prometheus-labels-go-cache go test ./internal/otelconfig -count=1
• GOCACHE=/private/tmp/byoo-prometheus-labels-go-cache go test ./...
• GOCACHE=/private/tmp/byoo-prometheus-labels-go-cache make validate-otelconfig was attempted. The local otelcol build exceeded five minutes before config validation began.

QA is not needed for this generated configuration change.

Issues

Fixes #534

Checklist

• I am familiar with the Contributing Guidelines.
• I have signed off my commits for Developer Certificate of Origin (DCO) compliance.
• New or existing tests cover these changes.
• The documentation is up to date with these changes.

Summary by CodeRabbit

• Improvements
  • Updated the bundled metric subset remote-write exporter configuration to omit resource_to_telemetry_conversion.
  • Advanced the bundled OpenTelemetry Collector version to 0.157.3.
• Tests
  • Updated configuration generation/validation expectations to match the simplified metric subset exporter configuration.

[coderabbitai]

📝 Walkthrough

Walkthrough

The metric subset Prometheus exporter no longer enables resource-to-telemetry conversion. The rendered configuration, Kubernetes example, and test expectations are updated, and the collector version is incremented to 0.157.3.

Changes

Metric subset exporter

Layer / File(s)	Summary
Disable resource-to-telemetry conversion src/compute-plane-services/byoo-otel-collector/internal/otelconfig/render.go, src/compute-plane-services/byoo-otel-collector/examples/otelconfigs/k8s/config_function_container_metric_subset.yaml, src/compute-plane-services/byoo-otel-collector/internal/otelconfig/render_test.go	The metric subset Prometheus exporter configuration and its expected example output no longer include resource_to_telemetry_conversion.
Increment collector version src/compute-plane-services/byoo-otel-collector/VERSION	The collector version changes from 0.157.2 to 0.157.3.

Estimated code review effort: 1 (Trivial) | ~5 minutes

Possibly related PRs

• NVIDIA/nvcf#506: Updates the same collector version file in the preceding version bump.

Suggested reviewers: estroz

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	The PR disables resource-to-telemetry conversion in the metric-subset exporter, matching issue #534's required fix.
Out of Scope Changes check	✅ Passed	The version bump and example/test updates are directly tied to the exporter behavior change and appear in scope.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title follows Conventional Commits and accurately describes the bug fix to prevent duplicate metric subset labels.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch kpathak/fix-byoo-prometheus-duplicate-labels

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