v1.6.1 release

Release of core packages

• opentelemetry-api
• opentelemetry-sdk

and exporter packages:

• opentelemetry-exporter-otlp (gRPC + HTTP/JSON)
• opentelemetry-exporter-etw
• opentelemetry-exporter-zipkin
• opentelemetry-exporter-jaeger (thrift + UDP/HTTP)

Changelog

API

• No API change

SDK

• Upgrade opentelemetry-proto to v0.19.0 by @lalitb in https://github.com/open-telemetry/opentelemetry-cpp/pull/1579
• Add error log when getting a http error code by @owent in https://github.com/open-telemetry/opentelemetry-cpp/pull/1581
• Fix ObservableInstrument::RemoveCallback by @ahadnagy in https://github.com/open-telemetry/opentelemetry-cpp/pull/1582
• Fix LoggerContext::Shutdown and tsan of OtlpHttpClient by @owent in https://github.com/open-telemetry/opentelemetry-cpp/pull/1592
• Fix header only api singletons (#1520) by @marcalff in https://github.com/open-telemetry/opentelemetry-cpp/pull/1604
• resource sdk: Update Resource::Merge function docs by @ricekot in https://github.com/open-telemetry/opentelemetry-cpp/pull/1615
• [gRPC]: Fix oob access of string_view in example by @Tradias in https://github.com/open-telemetry/opentelemetry-cpp/pull/1619
• Fixes span creation benchmark issue #1612. by @marcalff in https://github.com/open-telemetry/opentelemetry-cpp/pull/1622

Exporter

• ETW Exporter - Add support for Sampler and ID Generator by @lalitb in https://github.com/open-telemetry/opentelemetry-cpp/pull/1547
• ETW Exporter - Add Trace flags in SpanContext by @lalitb in https://github.com/open-telemetry/opentelemetry-cpp/pull/1618

Build

• codecov ignore paths by @esigo in https://github.com/open-telemetry/opentelemetry-cpp/pull/1609
• Fix build warnings by @marcalff in https://github.com/open-telemetry/opentelemetry-cpp/pull/1613
• Fix more build warnings (#1616) by @marcalff in https://github.com/open-telemetry/opentelemetry-cpp/pull/1620

Metrics

• Update metrics status to Release Candidate by @lalitb in https://github.com/open-telemetry/opentelemetry-cpp/pull/1570
• Metrics warnings by @esigo in https://github.com/open-telemetry/opentelemetry-cpp/pull/1583
• Fix 1585 - Multiple cumulative metric collections without measurement recording. by @lalitb in https://github.com/open-telemetry/opentelemetry-cpp/pull/1586
• Fix default value of OtlpHttpMetricExporterOptions::aggregation_temporality. by @owent in https://github.com/open-telemetry/opentelemetry-cpp/pull/1601
• Add Histogram tests for Synchronous Metric Storage. by @lalitb in https://github.com/open-telemetry/opentelemetry-cpp/pull/1597
• Add OTLP Metric Exporter Factory and OtlpGrpcClient by @owent in https://github.com/open-telemetry/opentelemetry-cpp/pull/1606
• Example for OTLP gRPC exporter for Metrics. by @lalitb in https://github.com/open-telemetry/opentelemetry-cpp/pull/1598

Sementic Convention

• Align on the specification 1.13.0 by @marcalff in https://github.com/open-telemetry/opentelemetry-cpp/pull/1625

New Contributors

• @ricekot made their first contribution in https://github.com/open-telemetry/opentelemetry-cpp/pull/1615
• @Tradias made their first contribution in https://github.com/open-telemetry/opentelemetry-cpp/pull/1619

Full Changelog: https://github.com/open-telemetry/opentelemetry-cpp/compare/v1.6.0...v1.6.1

Notes:

While OpenTelemetry semantic convention is still in experimental state, PR #1624 upgraded it from 1.12.0 to 1.13.0 which MAY break the instrumentation library. Please update the semantic convention in instrumentation library is needed.