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)

• 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.