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* Add the experimental exemplar feature * Add exemplars to EXPERIMENTAL.md * Add changelog entry * Fix hist buckets > 1 detection * Collect instead of Flush res about to be deleted * Add e2e test * Do not pre-alloc ResourceMetrics This only has a single use. * Fix grammatical error in comment * Add test cases Default and invalid OTEL_METRICS_EXEMPLAR_FILTER. Test sampled and non-sampled context for trace_based. * Comment nCPU * Doc OTEL_METRICS_EXEMPLAR_FILTER