v0.18.0

Added

• Pull sampling probability from OTEL_TRACES_SAMPLER_ARG in default sdk config #737
• Add schema_url to Tracer #743
• Add schema_url to Resource #775
• Add Span::set_attributes #638
• Support concurrent exports #781
• Add jaeger remote sampler #797
• Allow Custom Samplers #833
• Add SpanExporter::force_flush and default implementation #845

Changed

• Deprecate metrics ValueRecorder in favor of Histogram #728
• Move IdGenerator to SDK, rename to RandomIdGenerator #742
• meter_with_version accepts optional parameter for version and schema_url #752
• Unify Event and Link access patterns #757
• move SpanKind display format impl to jaeger crate #758
• make TraceStateError private #755
• rename Span::record_exception to Span::record_error #756
• Replace StatusCode and message with Status #760
• Move TracerProvider::force_flush to SDK #658
• Switch to static resource references #790
• Allow O(1) get operations for SpanBuilder::attributes [breaking] #799
• Allow ref counted keys and values #821
• Bump MSRV from 1.49 to 1.55 #811
• bump MSRV to 1.56 #866
• Update metrics API and SDK for latest spec #819
• Switch to pin-project-lite #830

Fixed

• Update dashmap to avoid soundness hole #818
• Perform sampling as explained in the specification #839
• Remove internal message queue between exporter and exporting tasks #848
• Fix span processor exporting unsampled spans #871

Removed

• Remove serialize feature #738
• Remove StatusCode::as_str #741
• Remove Tracer::with_span #746