Selective Metric Export & Configurable Default Attributes

[polartulip]

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What?

Enhance the k6 extension with the following features:

Selective Metric Export – Allow users to specify which k6 metrics should be exported, preventing unnecessary data collection and reducing storage usage. Configurable Default Attributes – Provide an option to control default attributes, making high-cardinality fields (e.g., URL) opt-in instead of being reported by default.

Why?

Efficiency & Storage Optimization – k6 generates a large number of metrics, many of which may not be required. Limiting exported metrics reduces storage consumption and improves performance. Better Resource Management – High-cardinality attributes like URLs can cause resource exhaustion and may not always be necessary. Making them opt-in allows users to control data volume more effectively.