[release] Prepare release core-1.15.0

RELEASENOTES.md

@@ -4,6 +4,20 @@ This file contains highlights and announcements covering all components.
 For more details see `CHANGELOG.md` files maintained in the root source
 directory of each individual package.
 
+## 1.15.0
+
+Release details: [1.15.0](https://github.com/open-telemetry/opentelemetry-dotnet/releases/tag/core-1.15.0)
+
+* Added support for `ActivitySource.TelemetrySchemaUrl`
+  and `Meter.TelemetrySchemaUrl` properties across exporters.
+* Improved performance and reduced memory consumption for metrics histograms.
+* Added mTLS configuration support for the OTLP exporter (client cert/key and
+  CA certificate options).
+* `OpenTelemetry.Exporter.Zipkin` is deprecated and will stop receiving updates
+  in December 2026. Zipkin already supports OTLP ingestion.
+  Migrate to `OpenTelemetry.Exporter.OpenTelemetryProtocol` as stated
+  in the [Deprecating Zipkin Exporter blog post](https://opentelemetry.io/blog/2025/deprecating-zipkin-exporters/).
+
 ## 1.14.0
 
 Release details: [1.14.0](https://github.com/open-telemetry/opentelemetry-dotnet/releases/tag/core-1.14.0)

src/OpenTelemetry.Api.ProviderBuilderExtensions/CHANGELOG.md

@@ -7,6 +7,10 @@ Notes](../../RELEASENOTES.md).
 
 ## Unreleased
 
+## 1.15.0
+
+Released 2026-Jan-21
+
 ## 1.14.0
 
 Released 2025-Nov-12

src/OpenTelemetry.Api/.publicApi/Stable/PublicAPI.Shipped.txt

@@ -153,7 +153,8 @@ OpenTelemetry.Trace.Tracer.StartRootSpan(string! name, OpenTelemetry.Trace.SpanK
 OpenTelemetry.Trace.Tracer.StartSpan(string! name, OpenTelemetry.Trace.SpanKind kind = OpenTelemetry.Trace.SpanKind.Internal, in OpenTelemetry.Trace.SpanContext parentContext = default(OpenTelemetry.Trace.SpanContext), OpenTelemetry.Trace.SpanAttributes? initialAttributes = null, System.Collections.Generic.IEnumerable<OpenTelemetry.Trace.Link>? links = null, System.DateTimeOffset startTime = default(System.DateTimeOffset)) -> OpenTelemetry.Trace.TelemetrySpan!
 OpenTelemetry.Trace.Tracer.StartSpan(string! name, OpenTelemetry.Trace.SpanKind kind, in OpenTelemetry.Trace.TelemetrySpan? parentSpan, OpenTelemetry.Trace.SpanAttributes? initialAttributes = null, System.Collections.Generic.IEnumerable<OpenTelemetry.Trace.Link>? links = null, System.DateTimeOffset startTime = default(System.DateTimeOffset)) -> OpenTelemetry.Trace.TelemetrySpan!
 OpenTelemetry.Trace.TracerProvider
-OpenTelemetry.Trace.TracerProvider.GetTracer(string! name, string? version = null, System.Collections.Generic.IEnumerable<System.Collections.Generic.KeyValuePair<string!, object?>>? tags = null) -> OpenTelemetry.Trace.Tracer!
+OpenTelemetry.Trace.TracerProvider.GetTracer(string! name, string? version = null, string? schemaUrl = null, System.Collections.Generic.IEnumerable<System.Collections.Generic.KeyValuePair<string!, object?>>? tags = null) -> OpenTelemetry.Trace.Tracer!
+OpenTelemetry.Trace.TracerProvider.GetTracer(string! name, string? version, System.Collections.Generic.IEnumerable<System.Collections.Generic.KeyValuePair<string!, object?>>? tags) -> OpenTelemetry.Trace.Tracer!
 OpenTelemetry.Trace.TracerProvider.GetTracer(string! name, string? version) -> OpenTelemetry.Trace.Tracer!
 OpenTelemetry.Trace.TracerProvider.TracerProvider() -> void
 OpenTelemetry.Trace.TracerProviderBuilder

src/OpenTelemetry.Api/.publicApi/Stable/PublicAPI.Unshipped.txt

@@ -1,3 +0,0 @@
-OpenTelemetry.Trace.TracerProvider.GetTracer(string! name, string? version = null, string? schemaUrl = null, System.Collections.Generic.IEnumerable<System.Collections.Generic.KeyValuePair<string!, object?>>? tags = null) -> OpenTelemetry.Trace.Tracer!
-OpenTelemetry.Trace.TracerProvider.GetTracer(string! name, string? version, System.Collections.Generic.IEnumerable<System.Collections.Generic.KeyValuePair<string!, object?>>? tags) -> OpenTelemetry.Trace.Tracer!
-*REMOVED*OpenTelemetry.Trace.TracerProvider.GetTracer(string! name, string? version = null, System.Collections.Generic.IEnumerable<System.Collections.Generic.KeyValuePair<string!, object?>>? tags = null) -> OpenTelemetry.Trace.Tracer!

src/OpenTelemetry.Api/CHANGELOG.md

@@ -6,6 +6,10 @@ Notes](../../RELEASENOTES.md).
 
 ## Unreleased
 
+## 1.15.0
+
+Released 2026-Jan-21
+
 * 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](https://github.com/open-telemetry/opentelemetry-dotnet/pull/6736))

src/OpenTelemetry.Exporter.Console/CHANGELOG.md

@@ -6,6 +6,10 @@ Notes](../../RELEASENOTES.md).
 
 ## Unreleased
 
+## 1.15.0
+
+Released 2026-Jan-21
+
 * Added support for `ActivitySource.TelemetrySchemaUrl` property.
   ([#6713](https://github.com/open-telemetry/opentelemetry-dotnet/pull/6713))
 

src/OpenTelemetry.Exporter.InMemory/.publicApi/Stable/PublicAPI.Shipped.txt

@@ -6,6 +6,7 @@ OpenTelemetry.Metrics.InMemoryExporterMetricsExtensions
 OpenTelemetry.Metrics.MetricSnapshot
 OpenTelemetry.Metrics.MetricSnapshot.Description.get -> string!
 OpenTelemetry.Metrics.MetricSnapshot.MeterName.get -> string!
+OpenTelemetry.Metrics.MetricSnapshot.MeterSchemaUrl.get -> string!
 OpenTelemetry.Metrics.MetricSnapshot.MeterVersion.get -> string!
 OpenTelemetry.Metrics.MetricSnapshot.MetricPoints.get -> System.Collections.Generic.IReadOnlyList<OpenTelemetry.Metrics.MetricPoint>!
 OpenTelemetry.Metrics.MetricSnapshot.MetricSnapshot(OpenTelemetry.Metrics.Metric! metric) -> void

src/OpenTelemetry.Exporter.InMemory/.publicApi/Stable/PublicAPI.Unshipped.txt

@@ -1 +0,0 @@
-OpenTelemetry.Metrics.MetricSnapshot.MeterSchemaUrl.get -> string!

src/OpenTelemetry.Exporter.InMemory/CHANGELOG.md

@@ -6,6 +6,10 @@ Notes](../../RELEASENOTES.md).
 
 ## Unreleased
 
+## 1.15.0
+
+Released 2026-Jan-21
+
 * Added support for `Meter.TelemetrySchemaUrl` property.
   ([#6714](https://github.com/open-telemetry/opentelemetry-dotnet/pull/6714))
 

src/OpenTelemetry.Exporter.OpenTelemetryProtocol/.publicApi/Stable/PublicAPI.Shipped.txt

@@ -15,6 +15,8 @@ OpenTelemetry.Exporter.OtlpExporterOptions.Protocol.get -> OpenTelemetry.Exporte
 OpenTelemetry.Exporter.OtlpExporterOptions.Protocol.set -> void
 OpenTelemetry.Exporter.OtlpExporterOptions.TimeoutMilliseconds.get -> int
 OpenTelemetry.Exporter.OtlpExporterOptions.TimeoutMilliseconds.set -> void
+OpenTelemetry.Exporter.OtlpExporterOptions.UserAgentProductIdentifier.get -> string?
+OpenTelemetry.Exporter.OtlpExporterOptions.UserAgentProductIdentifier.set -> void
 OpenTelemetry.Exporter.OtlpExportProtocol
 OpenTelemetry.Exporter.OtlpExportProtocol.Grpc = 0 -> OpenTelemetry.Exporter.OtlpExportProtocol
 OpenTelemetry.Exporter.OtlpExportProtocol.HttpProtobuf = 1 -> OpenTelemetry.Exporter.OtlpExportProtocol

src/OpenTelemetry.Exporter.OpenTelemetryProtocol/.publicApi/Stable/PublicAPI.Unshipped.txt

@@ -1,2 +0,0 @@
-OpenTelemetry.Exporter.OtlpExporterOptions.UserAgentProductIdentifier.get -> string?
-OpenTelemetry.Exporter.OtlpExporterOptions.UserAgentProductIdentifier.set -> void

src/OpenTelemetry.Exporter.OpenTelemetryProtocol/CHANGELOG.md

@@ -7,6 +7,10 @@ Notes](../../RELEASENOTES.md).
 
 ## Unreleased
 
+## 1.15.0
+
+Released 2026-Jan-21
+
 * Added mTLS configuration support for the OTLP exporter (client cert/key and
   CA certificate options).
   ([#6343](https://github.com/open-telemetry/opentelemetry-dotnet/pull/6343))

src/OpenTelemetry.Exporter.Zipkin/CHANGELOG.md

@@ -6,6 +6,10 @@ Notes](../../RELEASENOTES.md).
 
 ## Unreleased
 
+## 1.15.0
+
+Released 2026-Jan-21
+
 * 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

src/OpenTelemetry.Extensions.Hosting/CHANGELOG.md

@@ -6,6 +6,10 @@ Notes](../../RELEASENOTES.md).
 
 ## Unreleased
 
+## 1.15.0
+
+Released 2026-Jan-21
+
 ## 1.14.0
 
 Released 2025-Nov-12

src/OpenTelemetry.Extensions.Propagators/CHANGELOG.md

@@ -6,6 +6,10 @@ covering all components see: [Release Notes](../../RELEASENOTES.md).
 
 ## Unreleased
 
+## 1.15.0
+
+Released 2026-Jan-21
+
 * Deprecated `JaegerPropagator`. It will be removed in a future version.
   ([#6819](https://github.com/open-telemetry/opentelemetry-dotnet/pull/6819))
 

src/OpenTelemetry/.publicApi/Stable/PublicAPI.Shipped.txt

@@ -191,6 +191,7 @@ OpenTelemetry.Metrics.Metric
 OpenTelemetry.Metrics.Metric.Description.get -> string!
 OpenTelemetry.Metrics.Metric.GetMetricPoints() -> OpenTelemetry.Metrics.MetricPointsAccessor
 OpenTelemetry.Metrics.Metric.MeterName.get -> string!
+OpenTelemetry.Metrics.Metric.MeterSchemaUrl.get -> string!
 OpenTelemetry.Metrics.Metric.MeterTags.get -> System.Collections.Generic.IEnumerable<System.Collections.Generic.KeyValuePair<string!, object?>>?
 OpenTelemetry.Metrics.Metric.MeterVersion.get -> string!
 OpenTelemetry.Metrics.Metric.MetricType.get -> OpenTelemetry.Metrics.MetricType
@@ -235,6 +236,7 @@ OpenTelemetry.Metrics.MetricReaderOptions.TemporalityPreference.set -> void
 OpenTelemetry.Metrics.MetricReaderTemporalityPreference
 OpenTelemetry.Metrics.MetricReaderTemporalityPreference.Cumulative = 1 -> OpenTelemetry.Metrics.MetricReaderTemporalityPreference
 OpenTelemetry.Metrics.MetricReaderTemporalityPreference.Delta = 2 -> OpenTelemetry.Metrics.MetricReaderTemporalityPreference
+OpenTelemetry.Metrics.MetricReaderTemporalityPreference.LowMemory = 3 -> OpenTelemetry.Metrics.MetricReaderTemporalityPreference
 OpenTelemetry.Metrics.MetricStreamConfiguration
 OpenTelemetry.Metrics.MetricStreamConfiguration.CardinalityLimit.get -> int?
 OpenTelemetry.Metrics.MetricStreamConfiguration.CardinalityLimit.set -> void

src/OpenTelemetry/.publicApi/Stable/PublicAPI.Unshipped.txt

@@ -1,2 +0,0 @@
-OpenTelemetry.Metrics.Metric.MeterSchemaUrl.get -> string!
-OpenTelemetry.Metrics.MetricReaderTemporalityPreference.LowMemory = 3 -> OpenTelemetry.Metrics.MetricReaderTemporalityPreference

src/OpenTelemetry/CHANGELOG.md

@@ -6,6 +6,10 @@ Notes](../../RELEASENOTES.md).
 
 ## Unreleased
 
+## 1.15.0
+
+Released 2026-Jan-21
+
 * 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.