[dashpole]

Description

Update _CustomCollector.collect in opentelemetry-exporter-prometheus to only create and yield the target_info metric when the merged resource attributes are non-empty, matching the OpenTelemetry Prometheus compatibility specification.

(Note: the otel_scope_info part of #3455 was superseded by open-telemetry/opentelemetry-specification#5052 and implemented via otel_scope_* labels in #5123.)

Fixes #3455

Type of change

• Bug fix (non-breaking change which fixes an issue)

Checklist:

See contributing.md for styleguide, changelog guidelines, and more.

• I am a human and not a bot
• I have run tox -e precommit
• I have run tox -e typecheck
• I have run the relevant tests and linting tox environments
• This requires the following PR in contrib:

[opentelemetry-pr-dashboard]

Pull request dashboard status

Waiting on the author · refreshed 2026-11-15 07:27 UTC

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🟢 Approval recommended

No active review issues remain for the change to omit target_info when resource attributes are empty.

No open issues 🎉

_{Review effort: Balanced}

[herin049]

Can we also add one or two scenarios that utilize the self.verify_text_format helper?