[release] Prepare release core-1.15.3

src/OpenTelemetry.Api.ProviderBuilderExtensions/CHANGELOG.md

@@ -7,6 +7,10 @@ Notes](../../RELEASENOTES.md).
 
 ## Unreleased
 
+## 1.15.3
+
+Released 2026-Apr-20
+
 ## 1.15.2
 
 Released 2026-Apr-08

src/OpenTelemetry.Api/CHANGELOG.md

@@ -6,6 +6,10 @@ Notes](../../RELEASENOTES.md).
 
 ## Unreleased
 
+## 1.15.3
+
+Released 2026-Apr-20
+
 * Fix baggage and trace headers not respecting the maximum length in some cases.
   ([#7061](https://github.com/open-telemetry/opentelemetry-dotnet/pull/7061))
 

src/OpenTelemetry.Exporter.Console/CHANGELOG.md

@@ -6,6 +6,10 @@ Notes](../../RELEASENOTES.md).
 
 ## Unreleased
 
+## 1.15.3
+
+Released 2026-Apr-20
+
 ## 1.15.2
 
 Released 2026-Apr-08

src/OpenTelemetry.Exporter.InMemory/CHANGELOG.md

@@ -6,6 +6,10 @@ Notes](../../RELEASENOTES.md).
 
 ## Unreleased
 
+## 1.15.3
+
+Released 2026-Apr-20
+
 ## 1.15.2
 
 Released 2026-Apr-08

src/OpenTelemetry.Exporter.OpenTelemetryProtocol/CHANGELOG.md

@@ -7,6 +7,10 @@ Notes](../../RELEASENOTES.md).
 
 ## Unreleased
 
+## 1.15.3
+
+Released 2026-Apr-20
+
 * `OtlpLogExporter` now uses `IHttpClientFactory` on .NET 8+, matching the
   behaviour of the trace and metrics exporters.
   ([#7109](https://github.com/open-telemetry/opentelemetry-dotnet/pull/7109))

src/OpenTelemetry.Exporter.Zipkin/CHANGELOG.md

@@ -6,6 +6,10 @@ Notes](../../RELEASENOTES.md).
 
 ## Unreleased
 
+## 1.15.3
+
+Released 2026-Apr-20
+
 * Harden memory usage for endpoint caching and array tag serialization.
   ([#7081](https://github.com/open-telemetry/opentelemetry-dotnet/pull/7081))
 

src/OpenTelemetry.Extensions.Hosting/CHANGELOG.md

@@ -6,6 +6,10 @@ Notes](../../RELEASENOTES.md).
 
 ## Unreleased
 
+## 1.15.3
+
+Released 2026-Apr-20
+
 ## 1.15.2
 
 Released 2026-Apr-08

src/OpenTelemetry.Extensions.Propagators/CHANGELOG.md

@@ -6,6 +6,10 @@ covering all components see: [Release Notes](../../RELEASENOTES.md).
 
 ## Unreleased
 
+## 1.15.3
+
+Released 2026-Apr-20
+
 * Improve efficiency of parsing of baggage, B3 and Jaeger propagation headers.
   ([#7061](https://github.com/open-telemetry/opentelemetry-dotnet/pull/7061))
 

src/OpenTelemetry/CHANGELOG.md

@@ -6,6 +6,10 @@ Notes](../../RELEASENOTES.md).
 
 ## Unreleased
 
+## 1.15.3
+
+Released 2026-Apr-20
+
 * Fix resource leak in batch and periodic exporting task workers for Blazor/WASM.
   ([#7069](https://github.com/open-telemetry/opentelemetry-dotnet/pull/7069))