Summary of Changes

Hello @shubham-up-47, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces a significant enhancement to gRPC telemetry by providing a mechanism to filter out specific OpenTelemetry resource attribute keys from metric labels before they are exported to Google Cloud Monitoring. This allows for more precise control over the data sent, potentially reducing noise and tailoring metrics to specific analytical needs. The changes involve adding a new configuration option, refactoring internal OpenTelemetry function types for broader use, and updating the metric exporter's internal logic to correctly apply these new filtering capabilities, ensuring robust and configurable telemetry data processing.

Highlights

• New Option for gRPC Metrics Label Filtering: Introduced GrpcMetricsExcludedLabelsOption which allows users to specify a std::set<std::string> of OpenTelemetry resource attribute keys to be excluded from gRPC telemetry metric labels when exporting to Google Cloud Monitoring.
• Refactoring of OpenTelemetry Types: The MonitoredResourceFromDataFn and ResourceFilterDataFn type aliases have been moved from the otel_internal namespace to the public otel namespace, making them accessible for configuration.
• Enhanced Metric Exporter Logic: The MonitoringExporter now includes logic to ensure that if a ResourceFilterDataFn is provided, a MonitoredResourceFromDataFn is also available, creating a default one if necessary to support dynamic resource handling.
• Flexible Filter Function Creation: A new utility function, MakeFilter, has been added to dynamically create the ResourceFilterDataFn based on either an explicitly provided filter function or the newly introduced GrpcMetricsExcludedLabelsOption.

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