_resource_attributes() in otlp_exporter.py built its own hardcoded
resource dict (service.name/instance.id/telemetry.scope only) instead
of reusing gateway_health_export.py's _runtime_resource_attributes(),
which already applies the resource_attributes allowlist from config.
Result: operator-configured attributes like deployment.environment.name
reached metrics and diagnostic logs but never spans.
Span resource building now delegates to the same
_runtime_resource_attributes() helper metrics/logs already use,
removing the duplicate implementation instead of patching it in place.
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