Remove internal dd.trace.scope.inherit.async.propagation feature flag (#7958)

This flag was added in #1850 (v0.64.0) in case we needed to revert the fixed behaviour, but we have never needed to do that.

Author: mcculls

dd-java-agent/instrumentation/opentelemetry/opentelemetry-0.3/src/test/groovy/TypeConverterTest.groovy

@@ -45,7 +45,7 @@ class TypeConverterTest extends AgentTestRunner {
   }
 
   def "should avoid extra allocation for a scope wrapper"() {
-    def scopeManager = new ContinuableScopeManager(0, false, true)
+    def scopeManager = new ContinuableScopeManager(0, false)
     def context = createTestSpanContext()
     def span1 = new DDSpan("test", 0, context, null)
     def span2 = new DDSpan("test", 0, context, null)

dd-java-agent/instrumentation/opentracing/api-0.31/src/test/groovy/TypeConverterTest.groovy

@@ -50,7 +50,7 @@ class TypeConverterTest extends AgentTestRunner {
   }
 
   def "should avoid extra allocation for a scope wrapper"() {
-    def scopeManager = new ContinuableScopeManager(0, false, true)
+    def scopeManager = new ContinuableScopeManager(0, false)
     def context = createTestSpanContext()
     def span1 = new DDSpan("test", 0, context, null)
     def span2 = new DDSpan("test", 0, context, null)

dd-java-agent/instrumentation/opentracing/api-0.32/src/test/groovy/TypeConverterTest.groovy

@@ -50,7 +50,7 @@ class TypeConverterTest extends AgentTestRunner {
   }
 
   def "should avoid extra allocation for a scope wrapper"() {
-    def scopeManager = new ContinuableScopeManager(0, false, true)
+    def scopeManager = new ContinuableScopeManager(0, false)
     def context = createTestSpanContext()
     def span1 = new DDSpan("test", 0, context, null)
     def span2 = new DDSpan("test", 0, context, null)

dd-trace-api/src/main/java/datadog/trace/api/config/TracerConfig.java

@@ -76,8 +76,6 @@ public final class TracerConfig {
 
   public static final String SCOPE_DEPTH_LIMIT = "trace.scope.depth.limit";
   public static final String SCOPE_STRICT_MODE = "trace.scope.strict.mode";
-  public static final String SCOPE_INHERIT_ASYNC_PROPAGATION =
-      "trace.scope.inherit.async.propagation";
   public static final String SCOPE_ITERATION_KEEP_ALIVE = "trace.scope.iteration.keep.alive";
   public static final String PARTIAL_FLUSH_ENABLED = "trace.partial.flush.enabled";
   public static final String PARTIAL_FLUSH_MIN_SPANS = "trace.partial.flush.min.spans";

dd-trace-core/src/main/java/datadog/trace/core/CoreTracer.java

@@ -635,7 +635,6 @@ private CoreTracer(
           new ContinuableScopeManager(
               config.getScopeDepthLimit(),
               config.isScopeStrictMode(),
-              config.isScopeInheritAsyncPropagation(),
               profilingContextIntegration,
               healthMetrics);
     } else {

dd-trace-core/src/main/java/datadog/trace/core/scopemanager/ContinuableScopeManager.java

@@ -48,7 +48,6 @@ public final class ContinuableScopeManager implements AgentScopeManager {
   final boolean strictMode;
   private final ScopeStackThreadLocal tlsScopeStack;
   private final int depthLimit;
-  private final boolean inheritAsyncPropagation;
   final HealthMetrics healthMetrics;
   private final ProfilingContextIntegration profilingContextIntegration;
 
@@ -57,36 +56,24 @@ public final class ContinuableScopeManager implements AgentScopeManager {
    *
    * @param depthLimit The maximum scope depth limit, <code>0</code> for unlimited.
    * @param strictMode Whether check if the closed spans are the active ones or not.
-   * @param inheritAsyncPropagation Whether the next span should inherit the active span
-   *     asyncPropagation flag.
    */
-  public ContinuableScopeManager(
-      final int depthLimit, final boolean strictMode, final boolean inheritAsyncPropagation) {
-    this(
-        depthLimit,
-        strictMode,
-        inheritAsyncPropagation,
-        ProfilingContextIntegration.NoOp.INSTANCE,
-        HealthMetrics.NO_OP);
+  public ContinuableScopeManager(final int depthLimit, final boolean strictMode) {
+    this(depthLimit, strictMode, ProfilingContextIntegration.NoOp.INSTANCE, HealthMetrics.NO_OP);
   }
 
   /**
    * Default constructor.
    *
    * @param depthLimit The maximum scope depth limit, <code>0</code> for unlimited.
    * @param strictMode Whether check if the closed spans are the active ones or not.
-   * @param inheritAsyncPropagation Whether the next span should inherit the active span
-   *     asyncPropagation flag.
    */
   public ContinuableScopeManager(
       final int depthLimit,
       final boolean strictMode,
-      final boolean inheritAsyncPropagation,
       final ProfilingContextIntegration profilingContextIntegration,
       final HealthMetrics healthMetrics) {
     this.depthLimit = depthLimit == 0 ? Integer.MAX_VALUE : depthLimit;
     this.strictMode = strictMode;
-    this.inheritAsyncPropagation = inheritAsyncPropagation;
     this.scopeListeners = new CopyOnWriteArrayList<>();
     this.extendedScopeListeners = new CopyOnWriteArrayList<>();
     this.healthMetrics = healthMetrics;
@@ -141,9 +128,7 @@ private AgentScope activate(
     boolean asyncPropagation =
         overrideAsyncPropagation
             ? isAsyncPropagating
-            : inheritAsyncPropagation && top != null
-                ? top.isAsyncPropagating()
-                : DEFAULT_ASYNC_PROPAGATING;
+            : top != null ? top.isAsyncPropagating() : DEFAULT_ASYNC_PROPAGATING;
 
     final ContinuableScope scope =
         new ContinuableScope(this, span, source, asyncPropagation, createScopeState(span));
@@ -219,10 +204,7 @@ public AgentScope activateNext(final AgentSpan span) {
 
     final ContinuableScope top = scopeStack.top;
 
-    boolean asyncPropagation =
-        inheritAsyncPropagation && top != null
-            ? top.isAsyncPropagating()
-            : DEFAULT_ASYNC_PROPAGATING;
+    boolean asyncPropagation = top != null ? top.isAsyncPropagating() : DEFAULT_ASYNC_PROPAGATING;
 
     final ContinuableScope scope =
         new ContinuableScope(

dd-trace-core/src/test/groovy/datadog/trace/core/PendingTraceBufferTest.groovy

@@ -31,7 +31,7 @@ class PendingTraceBufferTest extends DDSpecification {
 
   def tracer = Mock(CoreTracer)
   def traceConfig = Mock(CoreTracer.ConfigSnapshot)
-  def scopeManager = new ContinuableScopeManager(10, true, true)
+  def scopeManager = new ContinuableScopeManager(10, true)
   def factory = new PendingTrace.Factory(tracer, bufferSpy, SystemTimeSource.INSTANCE, false, HealthMetrics.NO_OP)
   List<TraceScope.Continuation> continuations = []
 

dd-trace-ot/src/test/groovy/datadog/opentracing/TypeConverterTest.groovy

@@ -52,7 +52,7 @@ class TypeConverterTest extends DDSpecification {
   }
 
   def "should avoid extra allocation for a scope wrapper"() {
-    def scopeManager = new ContinuableScopeManager(0, false, true)
+    def scopeManager = new ContinuableScopeManager(0, false)
     def context = createTestSpanContext()
     def span1 = new DDSpan("test", 0, context, null)
     def span2 = new DDSpan("test", 0, context, null)

internal-api/src/main/java/datadog/trace/api/Config.java

@@ -174,7 +174,6 @@ public static String getHostName() {
   private final Set<String> splitByTags;
   private final int scopeDepthLimit;
   private final boolean scopeStrictMode;
-  private final boolean scopeInheritAsyncPropagation;
   private final int scopeIterationKeepAlive;
   private final int partialFlushMinSpans;
   private final boolean traceStrictWritesEnabled;
@@ -854,8 +853,6 @@ private Config(final ConfigProvider configProvider, final InstrumenterConfig ins
 
     scopeStrictMode = configProvider.getBoolean(SCOPE_STRICT_MODE, false);
 
-    scopeInheritAsyncPropagation = configProvider.getBoolean(SCOPE_INHERIT_ASYNC_PROPAGATION, true);
-
     scopeIterationKeepAlive =
         configProvider.getInteger(SCOPE_ITERATION_KEEP_ALIVE, DEFAULT_SCOPE_ITERATION_KEEP_ALIVE);
 
@@ -2073,10 +2070,6 @@ public boolean isScopeStrictMode() {
     return scopeStrictMode;
   }
 
-  public boolean isScopeInheritAsyncPropagation() {
-    return scopeInheritAsyncPropagation;
-  }
-
   public int getScopeIterationKeepAlive() {
     return scopeIterationKeepAlive;
   }
@@ -4168,8 +4161,6 @@ public String toString() {
         + scopeDepthLimit
         + ", scopeStrictMode="
         + scopeStrictMode
-        + ", scopeInheritAsyncPropagation="
-        + scopeInheritAsyncPropagation
         + ", scopeIterationKeepAlive="
         + scopeIterationKeepAlive
         + ", partialFlushMinSpans="