Fix add missing thread name/id to app start spans

CHANGELOG.md

@@ -13,6 +13,7 @@
 - Fix old profiles deletion on SDK init ([#3216](https://github.com/getsentry/sentry-java/pull/3216))
 - Fix hub restore point in wrappers: SentryWrapper, SentryTaskDecorator and SentryScheduleHook ([#3225](https://github.com/getsentry/sentry-java/pull/3225))
   - We now reset the hub to its previous value on the thread where the `Runnable`/`Callable`/`Supplier` is executed instead of setting it to the hub that was used on the thread where the `Runnable`/`Callable`/`Supplier` was created.
+- Fix add missing thread name/id to app start spans ([#3226](https://github.com/getsentry/sentry-java/pull/3226))
 
 ## 7.4.0
 

sentry-android-core/src/main/java/io/sentry/android/core/PerformanceAndroidEventProcessor.java

@@ -4,11 +4,13 @@
 import static io.sentry.android.core.ActivityLifecycleIntegration.APP_START_WARM;
 import static io.sentry.android.core.ActivityLifecycleIntegration.UI_LOAD_OP;
 
+import android.os.Looper;
 import io.sentry.EventProcessor;
 import io.sentry.Hint;
 import io.sentry.MeasurementUnit;
 import io.sentry.SentryEvent;
 import io.sentry.SpanContext;
+import io.sentry.SpanDataConvention;
 import io.sentry.SpanId;
 import io.sentry.SpanStatus;
 import io.sentry.android.core.performance.ActivityLifecycleTimeSpan;
@@ -231,6 +233,11 @@ private static SentrySpan timeSpanToSentrySpan(
       final @Nullable SpanId parentSpanId,
       final @NotNull SentryId traceId,
       final @NotNull String operation) {
+
+    final Map<String, Object> defaultSpanData = new HashMap<>(2);
+    defaultSpanData.put(SpanDataConvention.THREAD_ID, Looper.getMainLooper().getThread().getId());
+    defaultSpanData.put(SpanDataConvention.THREAD_NAME, "main");
+
     return new SentrySpan(
         span.getStartTimestampSecs(),
         span.getProjectedStopTimestampSecs(),
@@ -242,6 +249,6 @@ private static SentrySpan timeSpanToSentrySpan(
         SpanStatus.OK,
         APP_METRICS_ORIGIN,
         new HashMap<>(),
-        null);
+        defaultSpanData);
   }
 }

sentry-android-core/src/test/java/io/sentry/android/core/PerformanceAndroidEventProcessorTest.kt

@@ -1,6 +1,7 @@
 package io.sentry.android.core
 
 import android.content.ContentProvider
+import androidx.test.ext.junit.runners.AndroidJUnit4
 import io.sentry.Hint
 import io.sentry.IHub
 import io.sentry.MeasurementUnit
@@ -18,6 +19,7 @@ import io.sentry.android.core.performance.AppStartMetrics.AppStartType
 import io.sentry.protocol.MeasurementValue
 import io.sentry.protocol.SentrySpan
 import io.sentry.protocol.SentryTransaction
+import org.junit.runner.RunWith
 import org.mockito.kotlin.any
 import org.mockito.kotlin.mock
 import org.mockito.kotlin.whenever
@@ -27,6 +29,7 @@ import kotlin.test.assertEquals
 import kotlin.test.assertFalse
 import kotlin.test.assertTrue
 
+@RunWith(AndroidJUnit4::class)
 class PerformanceAndroidEventProcessorTest {
 
     private class Fixture {
@@ -398,6 +401,61 @@ class PerformanceAndroidEventProcessorTest {
         )
     }
 
+    @Test
+    fun `adds main thread name and id to app start spans`() {
+        // given some cold app start metrics
+        // where class loaded happened way before app start
+        val appStartMetrics = AppStartMetrics.getInstance()
+        appStartMetrics.appStartType = AppStartType.COLD
+        appStartMetrics.appStartTimeSpan.setStartedAt(1)
+        appStartMetrics.appStartTimeSpan.setStoppedAt(3000)
+
+        AppStartMetrics.getInstance().applicationOnCreateTimeSpan.apply {
+            setStartedAt(1000)
+            description = "com.example.App.onCreate"
+            setStoppedAt(2000)
+        }
+
+        val sut = fixture.getSut(enablePerformanceV2 = true)
+        val context = TransactionContext("Activity", UI_LOAD_OP)
+        val tracer = SentryTracer(context, fixture.hub)
+        var tr = SentryTransaction(tracer)
+        val appStartSpan = SentrySpan(
+            0.0,
+            1.0,
+            tr.contexts.trace!!.traceId,
+            SpanId(),
+            null,
+            APP_START_COLD,
+            "App Start",
+            SpanStatus.OK,
+            null,
+            emptyMap(),
+            null
+        )
+        tr.spans.add(appStartSpan)
+
+        // when the processor attaches the app start spans
+        tr = sut.process(tr, Hint())
+
+        // thread name and id should be set
+        assertTrue {
+            tr.spans.any {
+                it.op == "process.load" &&
+                    it.data!!["thread.name"] == "main" &&
+                    it.data!!.containsKey("thread.id")
+            }
+        }
+
+        assertTrue {
+            tr.spans.any {
+                it.op == "application.load" &&
+                    it.data!!["thread.name"] == "main" &&
+                    it.data!!.containsKey("thread.id")
+            }
+        }
+    }
+
     private fun setAppStart(options: SentryAndroidOptions, coldStart: Boolean = true) {
         AppStartMetrics.getInstance().apply {
             appStartType = when (coldStart) {