v1.13.1

Release details: 1.13.1

• In version 1.13.0, the digital signature (.dll-keyless.sig) and
  certificate (.dll-keyless.pem) files were unintentionally omitted from the
  published NuGet packages.
• This hotfix restores the Sigstore signing artifacts for all target frameworks
  (net462, netstandard2.0, netstandard2.1, net8.0, net9.0), ensuring
  the integrity of DLL verification using Sigstore cosign.

v1.13.0

Release details: 1.13.0

• gRPC calls to export traces, logs, and metrics using OtlpExportProtocol.Grpc
  now set the TE=trailers HTTP request header to improve interoperability.
• EventName is now exported by default as EventName instead of
  logrecord.event.name when specified through ILogger or the experimental
  log bridge API.

v1.12.0

Release details: 1.12.0

• Breaking Change: OpenTelemetry.Exporter.OpenTelemetryProtocol now
  defaults to using OTLP/HTTP instead of OTLP/gRPC when targeting .NET Framework
  and .NET Standard. This change may cause telemetry export to fail unless
  appropriate adjustments are made. Explicitly setting OTLP/gRPC may result in a
  NotSupportedException unless further configuration is applied. See
  #​6209 for
  full details and mitigation guidance. #​6229

v1.11.1

Release details: 1.11.1

• Fixed a bug preventing OpenTelemetry.Exporter.OpenTelemetryProtocol from
  exporting telemetry on .NET Framework.

v1.11.0

Release details: 1.11.0

• OpenTelemetry.Exporter.OpenTelemetryProtocol no longer depends on the
  Google.Protobuf, Grpc, or Grpc.Net.Client packages. Serialization and
  transmission of outgoing data is now performed manually to improve the overall
  performance.

v1.10.0

Release details: 1.10.0

• Bumped the package versions of System.Diagnostic.DiagnosticSource and other
  Microsoft.Extensions.* packages to 9.0.0.

• Added support for new APIs introduced in System.Diagnostics.DiagnosticSource
9.0.0:

  • InstrumentAdvice<T>

    For details see: Explicit bucket histogram
    aggregation.

  • Gauge<T>

  • ActivitySource.Tags
    (supported in OtlpExporter & ConsoleExporter)

• Experimental features promoted to stable:

  • CardinalityLimit can now be managed for individual metrics via the View
    API. For details see: Changing cardinality limit for a
    Metric.

  • The overflow
    attribute
    (otel.metric.overflow) behavior is now enabled by default. The
    OTEL_DOTNET_EXPERIMENTAL_METRICS_EMIT_OVERFLOW_ATTRIBUTE environment
    variable is no longer required. For details see: Cardinality
    Limits.

  • The MetricPoint reclaim behavior is now enabled by default when Delta
    aggregation temporality is used. The
    OTEL_DOTNET_EXPERIMENTAL_METRICS_RECLAIM_UNUSED_METRIC_POINTS environment
    variable is no longer required. For details see: Cardinality
    Limits.

• Added OpenTelemetrySdk.Create API for configuring OpenTelemetry .NET signals
  (logging, tracing, and metrics) via a single builder. This new API simplifies
  bootstrap and teardown, and supports cross-cutting extensions targeting
  IOpenTelemetryBuilder.

• Removed out of support net6.0 target and added net9.0 target.