open-telemetry/opentelemetry-dotnet core-1.9.0-alpha.1

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NuGet: OpenTelemetry v1.9.0-alpha.1

• Experimental (pre-release builds only): Exposed ExemplarReservoir as a
  public API and added support for setting an ExemplarReservoir factory
  function when configuring a view (applies to individual metrics).
  (#5542)

• Fixed a race condition for the experimental MetricPoint reclaim scenario
  (enabled via OTEL_DOTNET_EXPERIMENTAL_METRICS_RECLAIM_UNUSED_METRIC_POINTS)
  which could have led to a measurement being dropped.
  (#5546)

• Experimental (pre-release builds only): Exposed
  FixedSizeExemplarReservoir as a public API to support custom implementations
  of ExemplarReservoir which may be configured using the
  ExemplarReservoirFactory property on the View API.
  (#5558)

• The experimental APIs previously covered by OTEL1002 (Exemplar,
  ExemplarFilterType, MeterProviderBuilder.SetExemplarFilter,
  ReadOnlyExemplarCollection, ReadOnlyFilteredTagCollection, &
  MetricPoint.TryGetExemplars) will now be part of the public API and
  supported in stable builds.
  (#5607)

• Fixed the nullable annotations for the SamplingResult constructors
  to allow null being supplied as attributes or traceStateString
  which has always been supported.
  (#5614)

• The ExemplarFilter used by SDK MeterProviders for histogram metrics can
  now be controlled via the experimental
  OTEL_DOTNET_EXPERIMENTAL_METRICS_EXEMPLAR_FILTER_HISTOGRAMS environment
  variable. The supported values are: always_off, always_on, and
  trace_based.
  (#5611)

See CHANGELOG for details.

NuGet: OpenTelemetry.Api v1.9.0-alpha.1

• Breaking change: Fix space character encoding from + to %20
  for baggage item values when propagating baggage as defined in
  W3C Baggage propagation format specification.
  (#5303)

See CHANGELOG for details.

NuGet: OpenTelemetry.Api.ProviderBuilderExtensions v1.9.0-alpha.1

No notable changes.

See CHANGELOG for details.

NuGet: OpenTelemetry.Exporter.Console v1.9.0-alpha.1

No notable changes.

See CHANGELOG for details.

NuGet: OpenTelemetry.Exporter.InMemory v1.9.0-alpha.1

No notable changes.

See CHANGELOG for details.

NuGet: OpenTelemetry.Exporter.OpenTelemetryProtocol v1.9.0-alpha.1

• User-Agent header format changed from
  OTel-OTLP-Exporter-Dotnet/{NuGet Package Version}+{Commit Hash}
  to OTel-OTLP-Exporter-Dotnet/{NuGet Package Version}.
  (#5528)

• Implementation of OTLP
  specification
  for propagating Span and SpanLink flags containing W3C trace flags and
  parent_is_remote information.
  (#5563)

• Introduced experimental support for automatically retrying export to the otlp
  endpoint by storing the telemetry offline during transient network errors.
  Users can enable this feature by setting the
  OTEL_DOTNET_EXPERIMENTAL_OTLP_RETRY environment variable to disk. The
  default path where the telemetry is stored is obtained by calling
  Path.GetTempPath()
  or can be customized by setting
  OTEL_DOTNET_EXPERIMENTAL_OTLP_DISK_RETRY_DIRECTORY_PATH environment
  variable.
  (#5527)

See CHANGELOG for details.

NuGet: OpenTelemetry.Exporter.Zipkin v1.9.0-alpha.1

No notable changes.

See CHANGELOG for details.

NuGet: OpenTelemetry.Extensions.Hosting v1.9.0-alpha.1

• Reverted obsoletion of OpenTelemetryBuilder.
  (#5571)

See CHANGELOG for details.

NuGet: OpenTelemetry.Extensions.Propagators v1.9.0-alpha.1

No notable changes.

See CHANGELOG for details.