feat(android): upgrade to OTel Android 0.13 and OTel Java 1.52

e2e/android/app/build.gradle.kts

@@ -104,22 +104,22 @@ dependencies {
 
     implementation("com.launchdarkly:launchdarkly-android-client-sdk:5.11.0")
 
-    implementation("io.opentelemetry:opentelemetry-api:1.51.0")
-    implementation("io.opentelemetry:opentelemetry-sdk:1.51.0")
-    implementation("io.opentelemetry:opentelemetry-exporter-otlp:1.51.0")
-    implementation("io.opentelemetry:opentelemetry-sdk-metrics:1.51.0")
+    implementation("io.opentelemetry:opentelemetry-api:1.52.0")
+    implementation("io.opentelemetry:opentelemetry-sdk:1.52.0")
+    implementation("io.opentelemetry:opentelemetry-exporter-otlp:1.52.0")
+    implementation("io.opentelemetry:opentelemetry-sdk-metrics:1.52.0")
 
     // Android HTTP Url instrumentation
-    implementation("io.opentelemetry.android.instrumentation:httpurlconnection-library:0.11.0-alpha")
-    byteBuddy("io.opentelemetry.android.instrumentation:httpurlconnection-agent:0.11.0-alpha")
+    implementation("io.opentelemetry.android.instrumentation:httpurlconnection-library:0.13.0-alpha")
+    byteBuddy("io.opentelemetry.android.instrumentation:httpurlconnection-agent:0.13.0-alpha")
 
     // Used for accessing the SignalFromDiskExporter class in TestApplication
-    implementation("io.opentelemetry.android:core:0.11.0-alpha")
+    implementation("io.opentelemetry.android:core:0.13.0-alpha")
 
     // OkHTTP instrumentation
-    implementation("io.opentelemetry.android.instrumentation:okhttp3-library:0.11.0-alpha")
-    byteBuddy("io.opentelemetry.android.instrumentation:okhttp3-agent:0.11.0-alpha")
-    implementation("com.squareup.okhttp3:okhttp:4.12.0")
+    implementation("io.opentelemetry.android.instrumentation:okhttp3-library:0.13.0-alpha")
+    byteBuddy("io.opentelemetry.android.instrumentation:okhttp3-agent:0.13.0-alpha")
+    implementation("com.squareup.okhttp3:okhttp:5.1.0")
 
     implementation("com.google.android.material:material:1.12.0")
     implementation("androidx.recyclerview:recyclerview:1.3.2")
@@ -147,8 +147,8 @@ dependencies {
     testImplementation(libs.junit)
     testImplementation(libs.core.ktx)
     testImplementation(libs.robolectric)
-    testImplementation("com.squareup.okhttp3:mockwebserver:4.12.0")
-    testImplementation("io.opentelemetry:opentelemetry-sdk-testing:1.51.0")
+    testImplementation("com.squareup.okhttp3:mockwebserver:5.1.0")
+    testImplementation("io.opentelemetry:opentelemetry-sdk-testing:1.52.0")
     testImplementation("org.jetbrains.kotlinx:kotlinx-coroutines-test:1.10.2")
     testImplementation(testFixtures(project(":observability-android")))
 

e2e/android/app/src/testCompose/java/com/example/androidobservability/DisablingConfigOptionsE2ETest.kt

@@ -14,6 +14,7 @@ import junit.framework.TestCase.assertEquals
 import junit.framework.TestCase.assertFalse
 import junit.framework.TestCase.assertNotNull
 import junit.framework.TestCase.assertTrue
+import okhttp3.mockwebserver.RecordedRequest
 import org.junit.After
 import org.junit.Ignore
 import org.junit.Test
@@ -264,17 +265,21 @@ class DisablingConfigOptionsE2ETest {
     private fun requestsContainsUrl(url: String): Boolean {
         while (true) {
             val request = application.mockWebServer?.takeRequest(100, TimeUnit.MILLISECONDS) ?: return false
-            if (request.requestUrl.toString() == url) return true
+            if (recordedUrl(request) == url) return true
         }
     }
 
     private fun requestsStartWith(prefix: String): Boolean {
         while (true) {
             val request = application.mockWebServer?.takeRequest(100, TimeUnit.MILLISECONDS) ?: return false
-            if (request.requestUrl.toString().startsWith(prefix)) return true
+            if (recordedUrl(request).startsWith(prefix)) return true
         }
     }
 
+    // MockWebServer 5 records the host as 127.0.0.1, while the expected URLs use `localhost`.
+    private fun recordedUrl(request: RecordedRequest): String =
+        request.requestUrl?.newBuilder()?.host("localhost")?.build().toString()
+
     private fun triggerTestLog(severity: Severity = Severity.INFO) {
         LDObserve.recordLog(
             message = TEST_LOG_MESSAGE,

sdk/@launchdarkly/mobile-dotnet/.vscode/settings.json

@@ -0,0 +1,3 @@
+{
+    "dotnet.defaultSolution": "mobile-dotnet.sln"
+}

sdk/@launchdarkly/mobile-dotnet/README.md

@@ -11,19 +11,33 @@ The LaunchDarkly Observability SDK for .NET MAUI provides automatic and manual i
 ### Automatic Instrumentation
 
 The .NET MAUI observability plugin automatically instruments:
-- **HTTP Requests**: Outgoing HTTP requests
-- **Crash Reporting**: Automatic crash reporting and stack traces
+- **HTTP Requests**: Outgoing HTTP requests made through `HttpClient` (`instrumentation.networkRequests`; requires `HttpActivityPropagationSupport`, see [Enabling HTTP request tracing](#enabling-http-request-tracing))
+- **Launch Times**: App launch performance (`instrumentation.launchTimes`)
 - **Feature Flag Evaluations**: Evaluation events added to your spans
 - **Session Management**: User session tracking and background timeout handling
 
+Automatic crash reporting is not enabled yet; use `LDObserve.RecordError` to report exceptions.
+
 ## Prerequisites
 
-*   **.NET 9.0** or higher is required.
-*   MAUI support for **iOS** and **Android**.
+*   **.NET 9** or **.NET 10** with the MAUI workload.
+*   **Android** API 23 or later and **iOS** 15 or later.
+
+### Enabling HTTP request tracing
+
+HTTP tracing needs one setting in your app's project file:
+
+```xml
+<PropertyGroup>
+  <HttpActivityPropagationSupport>true</HttpActivityPropagationSupport>
+</PropertyGroup>
+```
+
+The Android SDK sets this to `false` by default in every configuration, and the iOS SDK sets it to `false` in Release builds. While it is `false`, the trimmer removes the `System.Net.Http` diagnostics that the SDK listens to, so no HTTP spans are recorded even with `networkRequests: true`. The SDK cannot turn it back on at runtime.
 
 ## Example Application
 
-A complete example application is available in the [sample](./sample) directory.
+A complete example application is available in the [sample](./sample) directory. `MauiSample9.csproj` builds it for .NET 9 and `MauiSample10.csproj` for .NET 10; both share the same sources.
 
 ## Usage
 
@@ -64,6 +78,21 @@ public static class MauiProgram
 }
 ```
 
+Alternatively, register the plugin yourself when building the client configuration. `ObservabilityPlugin` takes the same options, including optional `SessionReplayOptions` as its second argument:
+
+```csharp
+using LaunchDarkly.Sdk.Client.Integrations;
+using LaunchDarkly.SessionReplay;
+
+var ldConfig = Configuration.Builder(mobileKey, ConfigurationBuilder.AutoEnvAttributes.Enabled)
+    .Plugins(new PluginConfigurationBuilder()
+        .Add(new ObservabilityPlugin(
+            new ObservabilityOptions(isEnabled: true, serviceName: "maui-sample-app"),
+            new SessionReplayOptions(isEnabled: true))))
+    .Build();
+var client = LdClient.Init(ldConfig, context, TimeSpan.FromSeconds(10));
+```
+
 #### Standalone (without a LaunchDarkly client)
 
 If you are not using the LaunchDarkly client, pass your mobile key directly. This boots the native observability stack without registering a plugin:
@@ -162,7 +191,7 @@ LDObserve.RecordLog(
 );
 ```
 
-Supported severity levels: `Trace`, `Debug`, `Info`, `Warn`, `Error`, `Fatal`.
+Supported severity levels: `Trace`, `Debug`, `Info`, `Warn`, `Error`, `Fatal`, each with numbered variants (for example `Info2` to `Info4`) matching the OpenTelemetry severity numbers.
 
 ##### Logs with Span Context
 

sdk/@launchdarkly/mobile-dotnet/android/LDObserve.Android.Binding/LDObserve.Android.Binding.csproj

@@ -33,11 +33,6 @@
     <PackageReference Include="CommunityToolkit.Maui.NativeLibraryInterop.BuildTasks" Version="0.0.1-pre1" PrivateAssets="all" />
   </ItemGroup>
 
-  <!-- KotlinX Serialization (Json) via NuGet so apps get it transitively -->
-  <ItemGroup>
-    <PackageReference Include="Org.Jetbrains.Kotlinx.KotlinxSerializationJson" Version="1.9.0" />
-  </ItemGroup>
-
   <!-- AndroidX Compose UI and Lifecycle -->
   <ItemGroup>
     <!-- These are only needed to build the binding project itself.