fix: move Otel testing library out production runtime

e2e/android/app/src/main/java/com/example/androidobservability/BaseApplication.kt

@@ -4,7 +4,6 @@ import android.app.Application
 import android.util.Log
 import android.widget.ImageView
 import com.launchdarkly.observability.api.ObservabilityOptions
-import com.launchdarkly.observability.client.TelemetryInspector
 import com.launchdarkly.observability.plugin.Observability
 import com.launchdarkly.observability.replay.PrivacyProfile
 import com.launchdarkly.observability.replay.ReplayOptions
@@ -42,7 +41,6 @@ open class BaseApplication : Application() {
         logAdapter = LDAndroidLogging.adapter(),
     )
 
-    var telemetryInspector: TelemetryInspector? = null
     var testUrl: String? = null
 
     open fun realInit() {
@@ -89,7 +87,6 @@ open class BaseApplication : Application() {
             .build()
 
         LDClient.init(this@BaseApplication, ldConfig, context, 1)
-        telemetryInspector = observabilityPlugin.getTelemetryInspector()
 
         if (testUrl == null) {
             // intervenes in E2E tests by trigger spans

e2e/android/app/src/test/java/com/example/androidobservability/SamplingE2ETest.kt

@@ -5,7 +5,7 @@ import androidx.test.core.app.ApplicationProvider
 import com.example.androidobservability.TestUtils.TelemetryType
 import com.example.androidobservability.TestUtils.waitForTelemetryData
 import com.launchdarkly.observability.api.ObservabilityOptions
-import com.launchdarkly.observability.client.TelemetryInspector
+import com.launchdarkly.observability.testing.InMemoryTelemetryInspector
 import com.launchdarkly.observability.sdk.LDObserve
 import io.opentelemetry.api.common.AttributeKey
 import io.opentelemetry.api.common.Attributes
@@ -46,7 +46,7 @@ class SamplingE2ETest {
     val testCoroutineRule = TestCoroutineRule()
 
     private val application = ApplicationProvider.getApplicationContext<Application>() as TestApplication
-    private var telemetryInspector: TelemetryInspector? = null
+    private var telemetryInspector: InMemoryTelemetryInspector? = null
 
     @Before
     fun setUp() {

e2e/android/app/src/test/java/com/example/androidobservability/TestApplication.kt

@@ -1,5 +1,6 @@
 package com.example.androidobservability
 
+import com.launchdarkly.observability.testing.InMemoryTelemetryInspector
 import com.launchdarkly.sdk.android.LDClient
 import io.opentelemetry.android.features.diskbuffering.SignalFromDiskExporter
 import okhttp3.mockwebserver.MockResponse
@@ -10,6 +11,8 @@ class TestApplication : BaseApplication() {
 
     private val host = "127.0.0.1"
     var mockWebServer: MockWebServer? = null
+    var telemetryInspector: InMemoryTelemetryInspector? = null
+        private set
 
     override fun onCreate() {
         // The Application class won't be initialized unless initForTest() is executed. This helps us to set up
@@ -40,6 +43,9 @@ class TestApplication : BaseApplication() {
 
     fun initForTest() {
         setupMockServer()
+        val inspector = InMemoryTelemetryInspector()
+        telemetryInspector = inspector
+        observabilityOptions = observabilityOptions.copy(telemetryInspector = inspector)
         super.realInit()
     }
 

e2e/android/app/src/test/java/com/example/androidobservability/TestUtils.kt

@@ -1,12 +1,12 @@
 package com.example.androidobservability
 
-import com.launchdarkly.observability.client.TelemetryInspector
+import com.launchdarkly.observability.testing.InMemoryTelemetryInspector
 
 object TestUtils {
 
     fun waitForTelemetryData(
         maxWaitMs: Long = 5000,
-        telemetryInspector: TelemetryInspector?,
+        telemetryInspector: InMemoryTelemetryInspector?,
         telemetryType: TelemetryType
     ): Boolean {
         val startTime = System.currentTimeMillis()

sdk/@launchdarkly/observability-android/lib/build.gradle.kts

@@ -46,11 +46,9 @@ dependencies {
     implementation("io.opentelemetry:opentelemetry-sdk-metrics:1.51.0")
     implementation("io.opentelemetry:opentelemetry-sdk-logs:1.51.0")
 
-    // TODO: Evaluate risks associated with incubator APIs
+    // Required at runtime by io.opentelemetry.android:core, which uses incubator APIs
+    // internally for the logs bridge. Can be removed once the OTel Android SDK drops this dependency.
     implementation("io.opentelemetry:opentelemetry-api-incubator:1.51.0-alpha")
-
-    // Testing exporters for telemetry inspection
-    implementation("io.opentelemetry:opentelemetry-sdk-testing:1.51.0")
 
     // OTEL Android
     implementation("io.opentelemetry.android:core:0.11.0-alpha")
@@ -61,13 +59,16 @@ dependencies {
     implementation("io.opentelemetry.android.instrumentation:activity:0.11.0-alpha")
 
     // Use JUnit Jupiter for testing.
+    // Testing exporters for telemetry inspection
+    testImplementation("io.opentelemetry:opentelemetry-sdk-testing:1.51.0")
     testImplementation(platform("org.junit:junit-bom:5.13.4"))
     testImplementation("org.junit.jupiter:junit-jupiter")
     testRuntimeOnly("org.junit.platform:junit-platform-launcher")
 
     testImplementation("io.mockk:mockk:1.14.5")
     testImplementation("org.jetbrains.kotlinx:kotlinx-coroutines-test:1.10.2")
 
+    testFixturesApi("io.opentelemetry:opentelemetry-sdk-testing:1.51.0")
     testFixturesImplementation("org.jetbrains.kotlinx:kotlinx-coroutines-test:1.10.2")
 }
 

sdk/@launchdarkly/observability-android/lib/src/main/kotlin/com/launchdarkly/observability/api/ObservabilityOptions.kt

@@ -2,6 +2,7 @@ package com.launchdarkly.observability.api
 
 import com.launchdarkly.logging.LDLogAdapter
 import com.launchdarkly.observability.BuildConfig
+import com.launchdarkly.observability.client.TelemetryInspector
 import com.launchdarkly.sdk.android.LDTimberLogging
 import io.opentelemetry.api.common.Attributes
 import kotlin.time.Duration
@@ -28,6 +29,9 @@ const val DEFAULT_BACKEND_URL = "https://pub.observability.app.launchdarkly.com"
  * @property instrumentations Options for configuring automatic instrumentations. See [Instrumentations].
  * @property logAdapter The log adapter to use. Defaults to using the LaunchDarkly SDK's LDTimberLogging.adapter(). Use LDAndroidLogging.adapter() to use the Android logging adapter.
  * @property loggerName The name of the logger to use. Defaults to "LaunchDarklyObservabilityPlugin".
+ * @property telemetryInspector Optional [TelemetryInspector] for intercepting exported telemetry during testing.
+ *   When provided together with [debug] = true, the inspector's exporters are wired into composite
+ *   exporters so that test code can assert on the data that flows through the SDK.
  */
 data class ObservabilityOptions(
     val enabled: Boolean = true,
@@ -46,6 +50,7 @@ data class ObservabilityOptions(
     val instrumentations: Instrumentations = Instrumentations(),
     val logAdapter: LDLogAdapter = LDTimberLogging.adapter(), // This follows the LaunchDarkly SDK's default log adapter
     val loggerName: String = "LaunchDarklyObservabilityPlugin",
+    val telemetryInspector: TelemetryInspector? = null,
 ){
     /**
      * Options for configuring traces.