core-1.15.2

For highlights and announcements pertaining to this release see: Release Notes > 1.15.2.

The following changes are from the previous release 1.15.1.

• NuGet: OpenTelemetry v1.15.2

  • Added Task-based worker support for BatchExportProcessor and
    PeriodicExportingMetricReader to enable OpenTelemetry to work in
    single-threaded WebAssembly environments such as Blazor and Uno Platform.
    The implementation automatically detects the WebAssembly runtime and switches
    to Task-based workers accordingly; the Thread-based approach remains the
    default on all other platforms.
    (#6379)

  See CHANGELOG for details.

• NuGet: OpenTelemetry.Api v1.15.2

  No notable changes.

  See CHANGELOG for details.

• NuGet: OpenTelemetry.Api.ProviderBuilderExtensions v1.15.2

  No notable changes.

  See CHANGELOG for details.

• NuGet: OpenTelemetry.Exporter.Console v1.15.2

  No notable changes.

  See CHANGELOG for details.

• NuGet: OpenTelemetry.Exporter.InMemory v1.15.2

  No notable changes.

  See CHANGELOG for details.

• NuGet: OpenTelemetry.Exporter.OpenTelemetryProtocol v1.15.2

  • Limit how much of the response body is read when export fails and
    error logging is enabled.
    (#7017)

  See CHANGELOG for details.

• NuGet: OpenTelemetry.Exporter.Zipkin v1.15.2

  No notable changes.

  See CHANGELOG for details.

• NuGet: OpenTelemetry.Extensions.Hosting v1.15.2

  No notable changes.

  See CHANGELOG for details.

• NuGet: OpenTelemetry.Extensions.Propagators v1.15.2

  No notable changes.

  See CHANGELOG for details.

coreunstable-1.15.2-beta.1

The following changes are from the previous release 1.15.1-beta.1.

• NuGet: OpenTelemetry.Exporter.Prometheus.AspNetCore v1.15.2-beta.1

  • Updated OpenTelemetry core component version(s) to 1.15.2.
    (#7049)

  See CHANGELOG for details.

• NuGet: OpenTelemetry.Exporter.Prometheus.HttpListener v1.15.2-beta.1

  • Updated OpenTelemetry core component version(s) to 1.15.2.
    (#7049)

  See CHANGELOG for details.

• NuGet: OpenTelemetry.Shims.OpenTracing v1.15.2-beta.1

  • Updated OpenTelemetry core component version(s) to 1.15.2.
    (#7049)

  See CHANGELOG for details.

core-1.15.1

For highlights and announcements pertaining to this release see: Release Notes > 1.15.1.

The following changes are from the previous release 1.15.0.

• NuGet: OpenTelemetry v1.15.1

  • Fixed Tracer.StartSpan() leaving the new span as Activity.Current when
    the previous activity was stopped by another thread during span creation.
    (#6257)

  • Fixed OverflowException in TraceIdRatioBasedSampler when trace ID bytes
    produced long.MinValue.
    ([#6928])

  • Fixed precision issues when using Histogram<float> with custom
    HistogramBucketBoundaries.
    (#6866)

  • Fixed a thread-safety issue in LogRecordSharedPool.Rent().
    (#6833)

  • Fixed observable instruments (ObservableCounter, ObservableUpDownCounter,
    ObservableGauge) continuing to export stale data points after a callback
    stops reporting a series.
    (#5950)

  See CHANGELOG for details.

• NuGet: OpenTelemetry.Api v1.15.1

  • Breaking change: The Baggage API implements the latest Baggage API
    specification,
    which disallows empty baggage names and treats baggage names and values as case
    sensitive.
    (#6931)

  See CHANGELOG for details.

• NuGet: OpenTelemetry.Api.ProviderBuilderExtensions v1.15.1

  No notable changes.

  See CHANGELOG for details.

• NuGet: OpenTelemetry.Exporter.Console v1.15.1

  No notable changes.

  See CHANGELOG for details.

• NuGet: OpenTelemetry.Exporter.InMemory v1.15.1

  No notable changes.

  See CHANGELOG for details.

• NuGet: OpenTelemetry.Exporter.OpenTelemetryProtocol v1.15.1

  No notable changes.

  See CHANGELOG for details.

• NuGet: OpenTelemetry.Exporter.Zipkin v1.15.1

  No notable changes.

  See CHANGELOG for details.

• NuGet: OpenTelemetry.Extensions.Hosting v1.15.1

  • Fix NullReferenceException when OTEL_SDK_DISABLED=true.
    (#6869)

  See CHANGELOG for details.

• NuGet: OpenTelemetry.Extensions.Propagators v1.15.1

  No notable changes.

  See CHANGELOG for details.

coreunstable-1.15.1-beta.1

The following changes are from the previous release 1.15.0-beta.1.

• NuGet: OpenTelemetry.Exporter.Prometheus.AspNetCore v1.15.1-beta.1

  • Updated OpenTelemetry core component version(s) to 1.15.1.
    (#7010)

  See CHANGELOG for details.

• NuGet: OpenTelemetry.Exporter.Prometheus.HttpListener v1.15.1-beta.1

  • Updated OpenTelemetry core component version(s) to 1.15.1.
    (#7010)

  See CHANGELOG for details.

• NuGet: OpenTelemetry.Shims.OpenTracing v1.15.1-beta.1

  • This package is deprecated and it will stop receiving any updates in
    March 2027. Use the OpenTelemetry API and SDK directly instead of the OpenTracing
    shims.
    (#6976)

  • Updated OpenTelemetry core component version(s) to 1.15.1.
    (#7010)

  See CHANGELOG for details.

core-1.15.0

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.

coreunstable-1.15.0-beta.1

The following changes are from the previous release 1.14.0-beta.1.

• NuGet: OpenTelemetry.Exporter.Prometheus.AspNetCore v1.15.0-beta.1

  • Updated OpenTelemetry core component version(s) to 1.15.0.
    (#6841)

  See CHANGELOG for details.

• NuGet: OpenTelemetry.Exporter.Prometheus.HttpListener v1.15.0-beta.1

  • Updated OpenTelemetry core component version(s) to 1.15.0.
    (#6841)

  See CHANGELOG for details.

• NuGet: OpenTelemetry.Shims.OpenTracing v1.15.0-beta.1

  • Updated OpenTelemetry core component version(s) to 1.15.0.
    (#6841)

  See CHANGELOG for details.

core-1.14.0

For highlights and announcements pertaining to this release see: Release Notes > 1.14.0.

The following changes are from the previous release 1.14.0-rc.1.

• NuGet: OpenTelemetry v1.14.0

  • Breaking Change NuGet packages now use the Sigstore bundle format
    (.sigstore.json) for digital signatures instead of separate signature
    (.sig) and certificate (.pem) files. This requires cosign 3.0 or later
    for verification. See the Digital signing
    section for updated verification instructions.
    (#6623)

  • Update to stable versions for .NET 10.0 NuGet packages.
    (#6667)

  • Update Microsoft.Extensions.* dependencies to 10.0.0 for .NET Framework
    and .NET Standard.
    (#6667)

  See CHANGELOG for details.

• NuGet: OpenTelemetry.Api v1.14.0

  • Breaking Change NuGet packages now use the Sigstore bundle format
    (.sigstore.json) for digital signatures instead of separate signature
    (.sig) and certificate (.pem) files. This requires cosign 3.0 or later
    for verification. See the Digital signing
    section for updated verification instructions.
    (#6623)

  • Update System.Diagnostics.DiagnosticSource dependency to 10.0.0
    for all target frameworks.
    (#6667)

  See CHANGELOG for details.

• NuGet: OpenTelemetry.Api.ProviderBuilderExtensions v1.14.0

  • Breaking Change NuGet packages now use the Sigstore bundle format
    (.sigstore.json) for digital signatures instead of separate signature
    (.sig) and certificate (.pem) files. This requires cosign 3.0 or later
    for verification. See the Digital signing
    section for updated verification instructions.
    (#6623)

  • Update to stable versions for .NET 10.0 NuGet packages.
    (#6667)

  • Update Microsoft.Extensions.* dependencies to 10.0.0 for .NET Framework
    and .NET Standard.
    (#6667)

  See CHANGELOG for details.

• NuGet: OpenTelemetry.Exporter.Console v1.14.0

  • Breaking Change NuGet packages now use the Sigstore bundle format
    (.sigstore.json) for digital signatures instead of separate signature
    (.sig) and certificate (.pem) files. This requires cosign 3.0 or later
    for verification. See the Digital signing
    section for updated verification instructions.
    (#6623)

  See CHANGELOG for details.

• NuGet: OpenTelemetry.Exporter.InMemory v1.14.0

  • Breaking Change NuGet packages now use the Sigstore bundle format
    (.sigstore.json) for digital signatures instead of separate signature
    (.sig) and certificate (.pem) files. This requires cosign 3.0 or later
    for verification. See the Digital signing
    section for updated verification instructions.
    (#6623)

  See CHANGELOG for details.

• NuGet: OpenTelemetry.Exporter.OpenTelemetryProtocol v1.14.0

  • Breaking Change NuGet packages now use the Sigstore bundle format
    (.sigstore.json) for digital signatures instead of separate signature
    (.sig) and certificate (.pem) files. This requires cosign 3.0 or later
    for verification. See the Digital signing
    section for updated verification instructions.
    (#6623)

  See CHANGELOG for details.

• NuGet: OpenTelemetry.Exporter.Zipkin v1.14.0

  • Breaking Change NuGet packages now use the Sigstore bundle format
    (.sigstore.json) for digital signatures instead of separate signature
    (.sig) and certificate (.pem) files. This requires cosign 3.0 or later
    for verification. See the Digital signing
    section for updated verification instructions.
    (#6623)

  See CHANGELOG for details.

• NuGet: OpenTelemetry.Extensions.Hosting v1.14.0

  • Breaking Change NuGet packages now use the Sigstore bundle format
    (.sigstore.json) for digital signatures instead of separate signature
    (.sig) and certificate (.pem) files. This requires cosign 3.0 or later
    for verification. See the Digital signing
    section for updated verification instructions.
    (#6623)

  • Update to stable versions for .NET 10.0 NuGet packages.
    (#6667)

  • Update Microsoft.Extensions.* dependencies to 10.0.0 for .NET Framework
    and .NET Standard.
    (#6667)

  See CHANGELOG for details.

• NuGet: OpenTelemetry.Extensions.Propagators v1.14.0

  • Breaking Change NuGet packages now use the Sigstore bundle format
    (.sigstore.json) for digital signatures instead of separate signature
    (.sig) and certificate (.pem) files. This requires cosign 3.0 or later
    for verification. See the Digital signing
    section for updated verification instructions.
    (#6623)

  See CHANGELOG for details.

coreunstable-1.14.0-beta.1

The following changes are from the previous release 1.13.1-beta.1.

• NuGet: OpenTelemetry.Exporter.Prometheus.AspNetCore v1.14.0-beta.1

  • Breaking Change When targeting net8.0, the package now depends on version
    8.0.0 of the Microsoft.Extensions.DependencyInjection.Abstractions,
    Microsoft.Extensions.Diagnostics.Abstractions and
    Microsoft.Extensions.Logging.Configuration NuGet packages.
    (#6327)

  • Add support for .NET 10.0.
    (#6307)

  • Added the possibility to disable timestamps via the PrometheusAspNetCoreOptions.
    (#6600)

  • Breaking Change NuGet packages now use the Sigstore bundle format
    (.sigstore.json) for digital signatures instead of separate signature
    (.sig) and certificate (.pem) files. This requires cosign 3.0 or later
    for verification. See the Digital signing
    section for updated verification instructions.
    (#6623)

  • Updated OpenTelemetry core component version(s) to 1.14.0.
    (#6689)

  See CHANGELOG for details.

• NuGet: OpenTelemetry.Exporter.Prometheus.HttpListener v1.14.0-beta.1

  • Breaking Change When targeting net8.0, the package now depends on version
    8.0.0 of the Microsoft.Extensions.DependencyInjection.Abstractions,
    Microsoft.Extensions.Diagnostics.Abstractions and
    Microsoft.Extensions.Logging.Configuration NuGet packages.
    (#6327)

  • Add support for .NET 10.0.
    (#6307)

  • Added the possibility to disable timestamps via the PrometheusHttpListenerOptions.
    (#6600)

  • Breaking Change NuGet packages now use the Sigstore bundle format
    (.sigstore.json) for digital signatures instead of separate signature
    (.sig) and certificate (.pem) files. This requires cosign 3.0 or later
    for verification. See the Digital signing
    section for updated verification instructions.
    (#6623)

  • Updated OpenTelemetry core component version(s) to 1.14.0.
    (#6689)

  See CHANGELOG for details.

• NuGet: OpenTelemetry.Shims.OpenTracing v1.14.0-beta.1

  • Add support for .NET 10.0.
    (#6307)

  • Breaking Change NuGet packages now use the Sigstore bundle format
    (.sigstore.json) for digital signatures instead of separate signature
    (.sig) and certificate (.pem) files. This requires cosign 3.0 or later
    for verification. See the Digital signing
    section for updated verification instructions.
    (#6623)

  • Updated OpenTelemetry core component version(s) to 1.14.0.
    (#6689)

  See CHANGELOG for details.

core-1.14.0-rc.1

The following changes are from the previous release 1.13.1.

• NuGet: OpenTelemetry v1.14.0-rc.1

  • Breaking Change When targeting net8.0, the package now depends on version
    8.0.0 of the Microsoft.Extensions.DependencyInjection.Abstractions,
    Microsoft.Extensions.Diagnostics.Abstractions and
    Microsoft.Extensions.Logging.Configuration NuGet packages.
    (#6327)

  • Add support for .NET 10.0.
    (#6307)

  See CHANGELOG for details.

• NuGet: OpenTelemetry.Api v1.14.0-rc.1

  • Add support for .NET 10.0.
    (#6307)

  • Update System.Diagnostics.DiagnosticSource dependency to 10.0.0
    for all target frameworks.
    (#6307)

  See CHANGELOG for details.

• NuGet: OpenTelemetry.Api.ProviderBuilderExtensions v1.14.0-rc.1

  • Breaking Change When targeting net8.0, the package now depends on version
    8.0.0 of the Microsoft.Extensions.DependencyInjection.Abstractions NuGet package.
    (#6327)

  • Add support for .NET 10.0.
    (#6307)

  See CHANGELOG for details.

• NuGet: OpenTelemetry.Exporter.Console v1.14.0-rc.1

  • Breaking Change When targeting net8.0, the package now depends on version
    8.0.0 of the Microsoft.Extensions.DependencyInjection.Abstractions,
    Microsoft.Extensions.Diagnostics.Abstractions and
    Microsoft.Extensions.Logging.Configuration NuGet packages.
    (#6327)

  • Add support for .NET 10.0.
    (#6307)

  See CHANGELOG for details.

• NuGet: OpenTelemetry.Exporter.InMemory v1.14.0-rc.1

  • Breaking Change When targeting net8.0, the package now depends on version
    8.0.0 of the Microsoft.Extensions.DependencyInjection.Abstractions,
    Microsoft.Extensions.Diagnostics.Abstractions and
    Microsoft.Extensions.Logging.Configuration NuGet packages.
    (#6327)

  • Add support for .NET 10.0.
    (#6307)

  See CHANGELOG for details.

• NuGet: OpenTelemetry.Exporter.OpenTelemetryProtocol v1.14.0-rc.1

  • Changed histogram protobuf serialization to use packed format for bucket_counts
    and explicit_bounds to be specification-compliant and fix issues with strict
    OTLP parsers. Lenient parsers should handle both formats.
    (#6567)

  • Add support for .NET 10.0.
    (#6307)

  See CHANGELOG for details.

• NuGet: OpenTelemetry.Exporter.Zipkin v1.14.0-rc.1

  • Breaking Change When targeting net8.0, the package now depends on version
    8.0.0 of the Microsoft.Extensions.DependencyInjection.Abstractions,
    Microsoft.Extensions.Diagnostics.Abstractions and
    Microsoft.Extensions.Logging.Configuration NuGet packages.
    (#6327)

  • Add support for .NET 10.0.
    (#6307)

  See CHANGELOG for details.

• NuGet: OpenTelemetry.Extensions.Hosting v1.14.0-rc.1

  • Breaking Change When targeting net8.0, the package now depends on version
    8.0.0 of the Microsoft.Extensions.DependencyInjection.Abstractions,
    Microsoft.Extensions.Diagnostics.Abstractions,
    Microsoft.Extensions.Hosting.Abstractions and
    Microsoft.Extensions.Logging.Configuration NuGet packages.
    (#6327)

  • Add support for .NET 10.0.
    (#6307)

  See CHANGELOG for details.

• NuGet: OpenTelemetry.Extensions.Propagators v1.14.0-rc.1

  • Add support for .NET 10.0.
    (#6307)

  See CHANGELOG for details.

coreunstable-1.13.1-beta.1

The following changes are from the previous release 1.13.0-beta.1.

• NuGet: OpenTelemetry.Exporter.Prometheus.AspNetCore v1.13.1-beta.1

  • Updated OpenTelemetry core component version(s) to 1.13.1.
    (#6598)

  See CHANGELOG for details.

• NuGet: OpenTelemetry.Exporter.Prometheus.HttpListener v1.13.1-beta.1

  • Updated OpenTelemetry core component version(s) to 1.13.1.
    (#6598)

  See CHANGELOG for details.

• NuGet: OpenTelemetry.Shims.OpenTracing v1.13.1-beta.1

  • Updated OpenTelemetry core component version(s) to 1.13.1.
    (#6598)

  See CHANGELOG for details.