[repo] Add content for 1.10.0 to release notes (open-telemetry#5937)

Author: CodeBlanch

RELEASENOTES.md

@@ -4,6 +4,41 @@ 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.
 
+## 1.10.0
+
+* Bumped the package versions of `System.Diagnostic.DiagnosticSource` and other
+  Microsoft.Extensions.* packages to `9.0.0`.
+
+* Added support for new APIs introduced in `System.Diagnostics.DiagnosticSource`
+  `9.0.0`:
+
+  * [InstrumentAdvice<T>](https://learn.microsoft.com/dotnet/api/system.diagnostics.metrics.instrumentadvice-1)
+
+  * [Gauge<T>](https://learn.microsoft.com/dotnet/api/system.diagnostics.metrics.gauge-1)
+
+  * [ActivitySource.Tags](https://learn.microsoft.com/dotnet/api/system.diagnostics.activitysource.tags)
+    (supported in OtlpExporter & ConsoleExporter)
+
+* Experimental features promoted to stable:
+
+  * `CardinalityLimit` can now be managed for individual metrics via the View
+    API. For details see: [Changing cardinality limit for a
+    Metric](./docs/metrics/customizing-the-sdk/README.md#changing-the-cardinality-limit-for-a-metric).
+
+  * The [overflow
+    attribute](https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/metrics/sdk.md#overflow-attribute)
+    (`otel.metric.overflow`) behavior is now enabled by default. The
+    `OTEL_DOTNET_EXPERIMENTAL_METRICS_EMIT_OVERFLOW_ATTRIBUTE` environment
+    variable is no longer required. For details see: [Cardinality
+    Limits](./docs/metrics/README.md#cardinality-limits).
+
+* Added `OpenTelemetrySdk.Create` API for configuring OpenTelemetry .NET signals
+  (logging, tracing, and metrics) via a single builder. This new API simplifies
+  bootstrap and teardown, and supports cross-cutting extensions targeting
+  `IOpenTelemetryBuilder`.
+
+* Removed out of support `net6.0` target and added `net9.0` target.
+
 ## 1.9.0
 
 * `Exemplars` are now part of the stable API! For details see: [customizing

build/scripts/add-labels.psm1

@@ -38,7 +38,7 @@ function AddLabelsOnPullRequestsBasedOnFilesChanged {
   # it automatically in order to also allow manual inclusion after reviewing files
   $managedLabels = 'infra', 'documentation', 'dependencies'
   $rootInfraFiles = 'global.json', 'NuGet.config', 'codeowners'
-  $documentationFiles = 'readme.md', 'contributing.md', 'releasing.md', 'versioning.md'
+  $documentationFiles = 'readme.md', 'contributing.md', 'releasing.md', 'versioning.md', 'releasenotes.md'
 
   foreach ($fileChanged in $filesChangedOnPullRequest)
   {