open-telemetry/opentelemetry-dotnet core-1.15.0

on GitHub

For highlights and announcements pertaining to this release see: Release Notes > 1.15.0.

The following changes are from the previous release 1.14.0.

• NuGet: OpenTelemetry v1.15.0

  • Added support for the OTEL_SDK_DISABLED environment variable in TracerProvider,
    MeterProvider, and LoggerProvider. When OTEL_SDK_DISABLED=true,
    the SDK returns no-op implementations for all telemetry signals.
    The OTEL_SDK_DISABLED environment variable is only evaluated upon application
    startup, later changes have no effect.
    (#6568)

  • Added LowMemory temporality as an option in the OTLP metrics exporter.
    (#6648)

  • Added support for Meter.TelemetrySchemaUrl property.
    (#6714)

  • Improve performance and reduce memory consumption for metrics histograms.
    (#6715)

  • Decode value in OTEL_RESOURCE_ATTRIBUTES environment variable.
    (#6737)

  See CHANGELOG for details.

• NuGet: OpenTelemetry.Api v1.15.0

  • Added a new overload for TracerProvider.GetTracer which accepts an optional
    string? schemaUrl parameter, allowing a schema URL to be set on the Tracer.
    (#6736)

  See CHANGELOG for details.

• NuGet: OpenTelemetry.Api.ProviderBuilderExtensions v1.15.0

  No notable changes.

  See CHANGELOG for details.

• NuGet: OpenTelemetry.Exporter.Console v1.15.0

  • Added support for ActivitySource.TelemetrySchemaUrl property.
    (#6713)

  • Added support for Meter.TelemetrySchemaUrl property.
    (#6714)

  See CHANGELOG for details.

• NuGet: OpenTelemetry.Exporter.InMemory v1.15.0

  • Added support for Meter.TelemetrySchemaUrl property.
    (#6714)

  See CHANGELOG for details.

• NuGet: OpenTelemetry.Exporter.OpenTelemetryProtocol v1.15.0

  • Added mTLS configuration support for the OTLP exporter (client cert/key and
    CA certificate options).
    (#6343)

  • Added UserAgentProductIdentifier property to OtlpExporterOptions to allow
    custom product identifiers to be prepended to the User-Agent header. When set,
    the custom identifier is prepended with a space separator to the default
    User-Agent string (e.g., MyApp/1.0 OTel-OTLP-Exporter-Dotnet/1.14.0).
    (#6686)

  • Added support for ActivitySource.TelemetrySchemaUrl property.
    (#6730)

  • Added support for Meter.TelemetrySchemaUrl property.
    (#6731)

  • Fix NullReferenceException when no bucket boundaries configured for a view.
    (#6773)

  • Added support for OTEL_EXPORTER_OTLP_METRICS_DEFAULT_HISTOGRAM_AGGREGATION
    environment variable to configure the default histogram aggregation for
    histogram instruments. Valid values are explicit_bucket_histogram (default)
    and base2_exponential_bucket_histogram. Explicit views configured via
    AddView take precedence over this setting.
    (#6778)

  See CHANGELOG for details.

• NuGet: OpenTelemetry.Exporter.Zipkin v1.15.0

  • This package is deprecated and it will stop receiving any updates in
    December 2026. Zipkin already supports OTLP ingestion. Change your exporter
    to OpenTelemetry.Exporter.OpenTelemetryProtocol as stated in the
    Deprecating Zipkin Exporter blog post.
    (#6750)

  See CHANGELOG for details.

• NuGet: OpenTelemetry.Extensions.Hosting v1.15.0

  No notable changes.

  See CHANGELOG for details.

• NuGet: OpenTelemetry.Extensions.Propagators v1.15.0

  • Deprecated JaegerPropagator. It will be removed in a future version.
    (#6819)

  See CHANGELOG for details.