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opentelemetrytracer: avoid exporting when there are no spans (#36313)
Commit Message: opentelemetrytracer: avoid exporting when there are no spans Additional Description: Today, the OpenTelemetry tracer exports a OTLP request on each interval, even when there are no spans to be sent. The OTLP is empty, only containing the resource (and its attributes). Risk Level: Low Testing: Manual Docs Changes: N/A Release Notes: N/A Platform Specific Features: [Optional Runtime guard:] [Optional Fixes #35997] [Optional Fixes commit #PR or SHA] [Optional Deprecated:] [Optional [API Considerations](https://github.com/envoyproxy/envoy/blob/main/api/review_checklist.md):] Signed-off-by: Joao Grassi <[email protected]>
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