Span processor integration tests#912
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* Revert "Revert "Add SpanProcessor for OpenTelemetry (#875)"" This reverts commit 2ced90e. * Better span sampler (#903) * Better span sampler This updates OpenTelemetry.Sampler so that it uses `traces_sample_rate` for sampling spans before they get sent to the span processor. This way we're not processing spans when they are dropped during sampling, which was previously the case as the Client was responsible for sampling just before attemping to send a transaction. * Enhance sampling logic to record discarded transactions * Clarify trace-level sampling decision-making Previously it incorrectly referred to "parent" where in reality we're dealing with spans from the same trace and respect sampling decisions that were already made for a given trace. This is not the same thing as parent/child spans that we're handling in the SpanProcessor as this type of relationship is established post-sampling. * Remove unnecessary sleep calls in sampler tests * Fix flaky test * Clean up make_sampling_decision * Simplify client reports for dropped transactions * Update traces_sample_rate default value to be nil * Account for `nil` sample_rate when sampling * Use put_test_config * Update traces_sample_rate spec to allow nil value * Support for traces_sampler option (#910) * Add support for `traces_sampler` config option * Update docs * Remove unnecessary attribute merging * Call traces_sampler only for root spans * Reuse sampling decision logic * Add test for handling invalid traces_sampler return values * Add tests for SamplingContext access functions * Add basic integration tests for OpenTelemetry (#912) * Update CHANGELOG
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This adds basic integration tests for opentelemetry integration to the sample integration test phoenix app.
#skip-changelog