diff --git a/packages/flutter_tools/lib/src/base/dds.dart b/packages/flutter_tools/lib/src/base/dds.dart
index c7fe0fa..74918a3 100644
--- a/packages/flutter_tools/lib/src/base/dds.dart
+++ b/packages/flutter_tools/lib/src/base/dds.dart
@@ -108,8 +108,4 @@
   }
 
   Future<void> shutdown() async => _ddsInstance?.shutdown();
-
-  void setExternalDevToolsUri(Uri uri) {
-    _ddsInstance?.setExternalDevToolsUri(uri);
-  }
 }
diff --git a/packages/flutter_tools/lib/src/commands/attach.dart b/packages/flutter_tools/lib/src/commands/attach.dart
index 438681b..9f73694 100644
--- a/packages/flutter_tools/lib/src/commands/attach.dart
+++ b/packages/flutter_tools/lib/src/commands/attach.dart
@@ -139,7 +139,6 @@
     usesTrackWidgetCreation(verboseHelp: verboseHelp);
     addDdsOptions(verboseHelp: verboseHelp);
     addDevToolsOptions(verboseHelp: verboseHelp);
-    addServeObservatoryOptions(verboseHelp: verboseHelp);
     usesDeviceTimeoutOption();
   }
 
@@ -201,8 +200,6 @@
     return uri;
   }
 
-  bool get serveObservatory => boolArg('serve-observatory') ?? false;
-
   String? get appId {
     return stringArgDeprecated('app-id');
   }
@@ -517,7 +514,6 @@
       enableDds: enableDds,
       ddsPort: ddsPort,
       devToolsServerAddress: devToolsServerAddress,
-      serveObservatory: serveObservatory,
     );
 
     return buildInfo.isDebug
diff --git a/packages/flutter_tools/lib/src/commands/run.dart b/packages/flutter_tools/lib/src/commands/run.dart
index d56b3a0..2fc0003 100644
--- a/packages/flutter_tools/lib/src/commands/run.dart
+++ b/packages/flutter_tools/lib/src/commands/run.dart
@@ -179,7 +179,6 @@
     usesDeviceTimeoutOption();
     addDdsOptions(verboseHelp: verboseHelp);
     addDevToolsOptions(verboseHelp: verboseHelp);
-    addServeObservatoryOptions(verboseHelp: verboseHelp);
     addAndroidSpecificBuildOptions(hide: !verboseHelp);
     usesFatalWarningsOption(verboseHelp: verboseHelp);
     addEnableImpellerFlag(verboseHelp: verboseHelp);
@@ -280,7 +279,6 @@
         nativeNullAssertions: boolArgDeprecated('native-null-assertions'),
         enableImpeller: enableImpeller,
         uninstallFirst: uninstallFirst,
-        serveObservatory: boolArgDeprecated('serve-observatory'),
         enableDartProfiling: enableDartProfiling,
       );
     }
diff --git a/packages/flutter_tools/lib/src/commands/test.dart b/packages/flutter_tools/lib/src/commands/test.dart
index 7c5c774..9dc9b7e 100644
--- a/packages/flutter_tools/lib/src/commands/test.dart
+++ b/packages/flutter_tools/lib/src/commands/test.dart
@@ -215,7 +215,6 @@
               'or as the string "none" to disable the timeout entirely.',
       );
     addDdsOptions(verboseHelp: verboseHelp);
-    addServeObservatoryOptions(verboseHelp: verboseHelp);
     usesFatalWarningsOption(verboseHelp: verboseHelp);
   }
 
@@ -405,7 +404,6 @@
       buildInfo,
       startPaused: startPaused,
       disableServiceAuthCodes: boolArgDeprecated('disable-service-auth-codes'),
-      serveObservatory: boolArgDeprecated('serve-observatory'),
       // On iOS >=14, keeping this enabled will leave a prompt on the screen.
       disablePortPublication: true,
       enableDds: enableDds,
diff --git a/packages/flutter_tools/lib/src/device.dart b/packages/flutter_tools/lib/src/device.dart
index 55ec8da..fbd2686 100644
--- a/packages/flutter_tools/lib/src/device.dart
+++ b/packages/flutter_tools/lib/src/device.dart
@@ -754,7 +754,6 @@
     this.nativeNullAssertions = false,
     this.enableImpeller = false,
     this.uninstallFirst = false,
-    this.serveObservatory = true,
     this.enableDartProfiling = true,
    }) : debuggingEnabled = true;
 
@@ -800,8 +799,7 @@
       fastStart = false,
       webEnableExpressionEvaluation = false,
       nullAssertions = false,
-      nativeNullAssertions = false,
-      serveObservatory = false;
+      nativeNullAssertions = false;
 
   DebuggingOptions._({
     required this.buildInfo,
@@ -846,7 +844,6 @@
     required this.nativeNullAssertions,
     required this.enableImpeller,
     required this.uninstallFirst,
-    required this.serveObservatory,
     required this.enableDartProfiling,
   });
 
@@ -883,7 +880,6 @@
   final bool webUseSseForDebugBackend;
   final bool webUseSseForInjectedClient;
   final bool enableImpeller;
-  final bool serveObservatory;
   final bool enableDartProfiling;
 
   /// Whether the tool should try to uninstall a previously installed version of the app.
@@ -1012,7 +1008,6 @@
     'nullAssertions': nullAssertions,
     'nativeNullAssertions': nativeNullAssertions,
     'enableImpeller': enableImpeller,
-    'serveObservatory': serveObservatory,
     'enableDartProfiling': enableDartProfiling,
   };
 
@@ -1060,7 +1055,6 @@
       nativeNullAssertions: json['nativeNullAssertions']! as bool,
       enableImpeller: (json['enableImpeller'] as bool?) ?? false,
       uninstallFirst: (json['uninstallFirst'] as bool?) ?? false,
-      serveObservatory: (json['serveObservatory'] as bool?) ?? false,
       enableDartProfiling: (json['enableDartProfiling'] as bool?) ?? true,
     );
 }
diff --git a/packages/flutter_tools/lib/src/resident_devtools_handler.dart b/packages/flutter_tools/lib/src/resident_devtools_handler.dart
index 0d210fd..6f3ccb6 100644
--- a/packages/flutter_tools/lib/src/resident_devtools_handler.dart
+++ b/packages/flutter_tools/lib/src/resident_devtools_handler.dart
@@ -91,26 +91,12 @@
     final List<FlutterDevice?> devicesWithExtension = await _devicesWithExtensions(flutterDevices);
     await _maybeCallDevToolsUriServiceExtension(devicesWithExtension);
     await _callConnectedVmServiceUriExtension(devicesWithExtension);
-
     if (_shutdown) {
       // If we're shutting down, no point reporting the debugger list.
       return;
     }
     _readyToAnnounce = true;
     assert(_devToolsLauncher!.activeDevToolsServer != null);
-
-    final Uri? devToolsUrl = _devToolsLauncher!.devToolsUrl;
-    if (devToolsUrl != null) {
-      for (final FlutterDevice? device in devicesWithExtension) {
-        if (device == null) {
-          continue;
-        }
-        // Notify the DDS instances that there's a DevTools instance available so they can correctly
-        // redirect DevTools related requests.
-        device.device?.dds.setExternalDevToolsUri(devToolsUrl);
-      }
-    }
-
     if (_residentRunner.reportedDebuggers) {
       // Since the DevTools only just became available, we haven't had a chance to
       // report their URLs yet. Do so now.
diff --git a/packages/flutter_tools/lib/src/resident_runner.dart b/packages/flutter_tools/lib/src/resident_runner.dart
index 6990128..dccdd2a 100644
--- a/packages/flutter_tools/lib/src/resident_runner.dart
+++ b/packages/flutter_tools/lib/src/resident_runner.dart
@@ -1402,26 +1402,6 @@
     _finished.complete(0);
   }
 
-  Future<void> enableObservatory() async {
-    assert(debuggingOptions.serveObservatory);
-    final List<Future<vm_service.Response?>> serveObservatoryRequests = <Future<vm_service.Response?>>[];
-    for (final FlutterDevice? device in flutterDevices) {
-      if (device == null) {
-        continue;
-      }
-      // Notify the VM service if the user wants Observatory to be served.
-      serveObservatoryRequests.add(
-        device.vmService?.callMethodWrapper('_serveObservatory') ??
-          Future<vm_service.Response?>.value(),
-      );
-    }
-    try {
-      await Future.wait(serveObservatoryRequests);
-    } on vm_service.RPCError catch(e) {
-      globals.printWarning('Unable to enable Observatory: $e');
-    }
-  }
-
   void appFinished() {
     if (_finished.isCompleted) {
       return;
diff --git a/packages/flutter_tools/lib/src/run_cold.dart b/packages/flutter_tools/lib/src/run_cold.dart
index a8ba6cf..4757763 100644
--- a/packages/flutter_tools/lib/src/run_cold.dart
+++ b/packages/flutter_tools/lib/src/run_cold.dart
@@ -80,17 +80,12 @@
       }
     }
 
-    if (debuggingEnabled) {
-      if (enableDevTools) {
-        // The method below is guaranteed never to return a failing future.
-        unawaited(residentDevtoolsHandler!.serveAndAnnounceDevTools(
-          devToolsServerAddress: debuggingOptions.devToolsServerAddress,
-          flutterDevices: flutterDevices,
-        ));
-      }
-      if (debuggingOptions.serveObservatory) {
-        await enableObservatory();
-      }
+    if (enableDevTools && debuggingEnabled) {
+      // The method below is guaranteed never to return a failing future.
+      unawaited(residentDevtoolsHandler!.serveAndAnnounceDevTools(
+        devToolsServerAddress: debuggingOptions.devToolsServerAddress,
+        flutterDevices: flutterDevices,
+      ));
     }
 
     if (flutterDevices.first.observatoryUris != null) {
@@ -167,17 +162,12 @@
       }
     }
 
-    if (debuggingEnabled) {
-      if (enableDevTools) {
-        // The method below is guaranteed never to return a failing future.
-        unawaited(residentDevtoolsHandler!.serveAndAnnounceDevTools(
-          devToolsServerAddress: debuggingOptions.devToolsServerAddress,
-          flutterDevices: flutterDevices,
-        ));
-      }
-      if (debuggingOptions.serveObservatory) {
-        await enableObservatory();
-      }
+    if (enableDevTools && debuggingEnabled) {
+      // The method below is guaranteed never to return a failing future.
+      unawaited(residentDevtoolsHandler!.serveAndAnnounceDevTools(
+        devToolsServerAddress: debuggingOptions.devToolsServerAddress,
+        flutterDevices: flutterDevices,
+      ));
     }
 
     appStartedCompleter?.complete();
diff --git a/packages/flutter_tools/lib/src/run_hot.dart b/packages/flutter_tools/lib/src/run_hot.dart
index 31fe164..1a89edd 100644
--- a/packages/flutter_tools/lib/src/run_hot.dart
+++ b/packages/flutter_tools/lib/src/run_hot.dart
@@ -237,10 +237,6 @@
       return 2;
     }
 
-    if (debuggingOptions.serveObservatory) {
-      await enableObservatory();
-    }
-
     if (enableDevTools) {
       // The method below is guaranteed never to return a failing future.
       unawaited(residentDevtoolsHandler!.serveAndAnnounceDevTools(
diff --git a/packages/flutter_tools/lib/src/runner/flutter_command.dart b/packages/flutter_tools/lib/src/runner/flutter_command.dart
index e8c8955..d67b80e 100644
--- a/packages/flutter_tools/lib/src/runner/flutter_command.dart
+++ b/packages/flutter_tools/lib/src/runner/flutter_command.dart
@@ -458,14 +458,6 @@
     );
   }
 
-  void addServeObservatoryOptions({required bool verboseHelp}) {
-    argParser.addFlag('serve-observatory',
-      hide: !verboseHelp,
-      defaultsTo: true,
-      help: 'Serve the legacy Observatory developer tooling through the VM service.',
-    );
-  }
-
   late final bool enableDds = () {
     bool ddsEnabled = false;
     if (argResults?.wasParsed('disable-dds') ?? false) {
diff --git a/packages/flutter_tools/lib/src/test/flutter_tester_device.dart b/packages/flutter_tools/lib/src/test/flutter_tester_device.dart
index 9b09f12..2e9e54f 100644
--- a/packages/flutter_tools/lib/src/test/flutter_tester_device.dart
+++ b/packages/flutter_tools/lib/src/test/flutter_tester_device.dart
@@ -11,7 +11,6 @@
 import 'package:meta/meta.dart';
 import 'package:process/process.dart';
 import 'package:stream_channel/stream_channel.dart';
-import 'package:vm_service/vm_service.dart' as vm_service;
 
 import '../base/file_system.dart';
 import '../base/io.dart';
@@ -181,15 +180,8 @@
           compileExpression: compileExpression,
           logger: logger,
         );
-        unawaited(localVmService.then((FlutterVmService vmservice) async {
+        unawaited(localVmService.then((FlutterVmService vmservice) {
           logger.printTrace('test $id: Successfully connected to service protocol: $forwardingUri');
-          if (debuggingOptions.serveObservatory) {
-            try {
-              await vmservice.callMethodWrapper('_serveObservatory');
-            } on vm_service.RPCError {
-              logger.printWarning('Unable to enable Observatory');
-            }
-          }
         }));
 
         if (debuggingOptions.startPaused && !machine!) {
@@ -198,7 +190,6 @@
           logger.printStatus('  $forwardingUri');
           logger.printStatus('You should first set appropriate breakpoints, then resume the test in the debugger.');
         }
-
         _gotProcessObservatoryUri.complete(forwardingUri);
       },
     );
diff --git a/packages/flutter_tools/test/general.shard/resident_devtools_handler_test.dart b/packages/flutter_tools/test/general.shard/resident_devtools_handler_test.dart
index 171030c..e3d3fcc 100644
--- a/packages/flutter_tools/test/general.shard/resident_devtools_handler_test.dart
+++ b/packages/flutter_tools/test/general.shard/resident_devtools_handler_test.dart
@@ -4,7 +4,6 @@
 
 import 'dart:async';
 
-import 'package:flutter_tools/src/base/dds.dart';
 import 'package:flutter_tools/src/base/logger.dart';
 import 'package:flutter_tools/src/build_info.dart';
 import 'package:flutter_tools/src/cache.dart';
@@ -111,9 +110,7 @@
 
   testWithoutContext('serveAndAnnounceDevTools with attached device does not fail on null vm service', () async {
     final ResidentDevtoolsHandler handler = FlutterResidentDevtoolsHandler(
-      FakeDevtoolsLauncher()
-        ..activeDevToolsServer = DevToolsServerAddress('localhost', 8080)
-        ..devToolsUrl = Uri.parse('http://localhost:8080'),
+      FakeDevtoolsLauncher()..activeDevToolsServer = DevToolsServerAddress('localhost', 8080),
       FakeResidentRunner(),
       BufferLogger.test(),
     );
@@ -128,9 +125,7 @@
 
   testWithoutContext('serveAndAnnounceDevTools with invokes devtools and vm_service setter', () async {
     final ResidentDevtoolsHandler handler = FlutterResidentDevtoolsHandler(
-      FakeDevtoolsLauncher()
-        ..activeDevToolsServer = DevToolsServerAddress('localhost', 8080)
-        ..devToolsUrl = Uri.parse('http://localhost:8080'),
+      FakeDevtoolsLauncher()..activeDevToolsServer = DevToolsServerAddress('localhost', 8080),
       FakeResidentRunner(),
       BufferLogger.test(),
     );
@@ -199,9 +194,7 @@
 
   testWithoutContext('serveAndAnnounceDevTools with web device', () async {
     final ResidentDevtoolsHandler handler = FlutterResidentDevtoolsHandler(
-      FakeDevtoolsLauncher()
-        ..activeDevToolsServer = DevToolsServerAddress('localhost', 8080)
-        ..devToolsUrl = Uri.parse('http://localhost:8080'),
+      FakeDevtoolsLauncher()..activeDevToolsServer = DevToolsServerAddress('localhost', 8080),
       FakeResidentRunner(),
       BufferLogger.test(),
     );
@@ -285,9 +278,7 @@
 
   testWithoutContext('serveAndAnnounceDevTools with multiple devices and VM service disappears on one', () async {
     final ResidentDevtoolsHandler handler = FlutterResidentDevtoolsHandler(
-      FakeDevtoolsLauncher()
-        ..activeDevToolsServer = DevToolsServerAddress('localhost', 8080)
-        ..devToolsUrl = Uri.parse('http://localhost:8080'),
+      FakeDevtoolsLauncher()..activeDevToolsServer = DevToolsServerAddress('localhost', 8080),
       FakeResidentRunner(),
       BufferLogger.test(),
     );
@@ -451,9 +442,6 @@
 
   @override
   bool reportedDebuggers = false;
-
-  @override
-  DebuggingOptions debuggingOptions = DebuggingOptions.disabled(BuildInfo.debug);
 }
 
 class FakeFlutterDevice extends Fake implements FlutterDevice {
@@ -470,35 +458,4 @@
 // Unfortunately Device, despite not being immutable, has an `operator ==`.
 // Until we fix that, we have to also ignore related lints here.
 // ignore: avoid_implementing_value_types
-class FakeDevice extends Fake implements Device {
-  @override
-  DartDevelopmentService get dds => FakeDartDevelopmentService();
-}
-
-class FakeDartDevelopmentService extends Fake implements DartDevelopmentService {
-  bool started = false;
-  bool disposed = false;
-
-  @override
-  final Uri uri = Uri.parse('http://127.0.0.1:1234/');
-
-  @override
-  Future<void> startDartDevelopmentService(
-    Uri observatoryUri, {
-    required Logger logger,
-    int? hostPort,
-    bool? ipv6,
-    bool? disableServiceAuthCodes,
-    bool cacheStartupProfile = false,
-  }) async {
-    started = true;
-  }
-
-  @override
-  Future<void> shutdown() async {
-    disposed = true;
-  }
-
-  @override
-  void setExternalDevToolsUri(Uri uri) {}
-}
+class FakeDevice extends Fake implements Device { }
diff --git a/packages/flutter_tools/test/general.shard/resident_runner_test.dart b/packages/flutter_tools/test/general.shard/resident_runner_test.dart
index d0d40ba..caada38 100644
--- a/packages/flutter_tools/test/general.shard/resident_runner_test.dart
+++ b/packages/flutter_tools/test/general.shard/resident_runner_test.dart
@@ -152,10 +152,6 @@
   }
 );
 
-const FakeVmServiceRequest serveObservatory = FakeVmServiceRequest(
-  method: '_serveObservatory',
-);
-
 final Uri testUri = Uri.parse('foo://bar');
 
 void main() {
@@ -195,7 +191,6 @@
   testUsingContext('ResidentRunner can attach to device successfully', () => testbed.run(() async {
     fakeVmServiceHost = FakeVmServiceHost(requests: <VmServiceExpectation>[
       listViews,
-      serveObservatory,
       listViews,
     ]);
     final Completer<DebugConnectionInfo> futureConnectionInfo = Completer<DebugConnectionInfo>.sync();
@@ -219,7 +214,6 @@
       .createSync(recursive: true);
     fakeVmServiceHost = FakeVmServiceHost(requests: <VmServiceExpectation>[
       listViews,
-      serveObservatory,
       listViews,
     ]);
     final FakeResidentCompiler residentCompiler = FakeResidentCompiler()
@@ -311,7 +305,6 @@
       .createSync(recursive: true);
     fakeVmServiceHost = FakeVmServiceHost(requests: <VmServiceExpectation>[
       listViews,
-      serveObservatory,
       listViews,
     ]);
     final FakeResidentCompiler residentCompiler = FakeResidentCompiler()
@@ -336,7 +329,6 @@
   testUsingContext('ResidentRunner can attach to device successfully with --fast-start', () => testbed.run(() async {
     fakeVmServiceHost = FakeVmServiceHost(requests: <VmServiceExpectation>[
       listViews,
-      serveObservatory,
       listViews,
       listViews,
       FakeVmServiceRequest(
@@ -405,7 +397,6 @@
   testUsingContext('ResidentRunner can handle an RPC exception from hot reload', () => testbed.run(() async {
     fakeVmServiceHost = FakeVmServiceHost(requests: <VmServiceExpectation>[
       listViews,
-      serveObservatory,
       listViews,
       listViews,
     ]);
@@ -439,7 +430,6 @@
   testUsingContext('ResidentRunner fails its operation if the device initialization is not complete', () => testbed.run(() async {
     fakeVmServiceHost = FakeVmServiceHost(requests: <VmServiceExpectation>[
       listViews,
-      serveObservatory,
       listViews,
     ]);
     final Completer<DebugConnectionInfo> futureConnectionInfo = Completer<DebugConnectionInfo>.sync();
@@ -461,7 +451,6 @@
   testUsingContext('ResidentRunner can handle an reload-barred exception from hot reload', () => testbed.run(() async {
     fakeVmServiceHost = FakeVmServiceHost(requests: <VmServiceExpectation>[
       listViews,
-      serveObservatory,
       listViews,
       listViews,
     ]);
@@ -497,7 +486,6 @@
   testUsingContext('ResidentRunner reports hot reload event with null safety analytics', () => testbed.run(() async {
     fakeVmServiceHost = FakeVmServiceHost(requests: <VmServiceExpectation>[
       listViews,
-      serveObservatory,
       listViews,
       listViews,
     ]);
@@ -544,8 +532,7 @@
 
   testUsingContext('ResidentRunner does not reload sources if no sources changed', () => testbed.run(() async {
     fakeVmServiceHost = FakeVmServiceHost(requests: <VmServiceExpectation>[
-      listViews,
-      serveObservatory,
+     listViews,
       listViews,
       listViews,
       FakeVmServiceRequest(
@@ -590,7 +577,6 @@
   testUsingContext('ResidentRunner reports error with missing entrypoint file', () => testbed.run(() async {
     fakeVmServiceHost = FakeVmServiceHost(requests: <VmServiceExpectation>[
       listViews,
-      serveObservatory,
       listViews,
       listViews,
       FakeVmServiceRequest(
@@ -651,7 +637,6 @@
    testUsingContext('ResidentRunner resets compilation time on reload reject', () => testbed.run(() async {
     fakeVmServiceHost = FakeVmServiceHost(requests: <VmServiceExpectation>[
       listViews,
-      serveObservatory,
       listViews,
       listViews,
       FakeVmServiceRequest(
@@ -716,7 +701,6 @@
   testUsingContext('ResidentRunner can send target platform to analytics from hot reload', () => testbed.run(() async {
     fakeVmServiceHost = FakeVmServiceHost(requests: <VmServiceExpectation>[
       listViews,
-      serveObservatory,
       listViews,
       listViews,
       FakeVmServiceRequest(
@@ -780,7 +764,6 @@
   testUsingContext('ResidentRunner can perform fast reassemble', () => testbed.run(() async {
     fakeVmServiceHost = FakeVmServiceHost(requests: <VmServiceExpectation>[
       listViews,
-      serveObservatory,
       FakeVmServiceRequest(
         method: 'getVM',
         jsonResponse: fakeVM.toJson(),
@@ -871,7 +854,6 @@
   testUsingContext('ResidentRunner reports hot reload time details', () => testbed.run(() async {
     fakeVmServiceHost = FakeVmServiceHost(requests: <VmServiceExpectation>[
       listViews,
-      serveObservatory,
       FakeVmServiceRequest(
         method: 'getVM',
         jsonResponse: fakeVM.toJson(),
@@ -961,7 +943,6 @@
   testUsingContext('ResidentRunner can send target platform to analytics from full restart', () => testbed.run(() async {
     fakeVmServiceHost = FakeVmServiceHost(requests: <VmServiceExpectation>[
       listViews,
-      serveObservatory,
       listViews,
       listViews,
       FakeVmServiceRequest(
@@ -1022,7 +1003,6 @@
   testUsingContext('ResidentRunner can remove breakpoints and exception-pause-mode from paused isolate during hot restart', () => testbed.run(() async {
     fakeVmServiceHost = FakeVmServiceHost(requests: <VmServiceExpectation>[
       listViews,
-      serveObservatory,
       listViews,
       listViews,
       FakeVmServiceRequest(
@@ -1096,7 +1076,6 @@
   testUsingContext('ResidentRunner will alternative the name of the dill file uploaded for a hot restart', () => testbed.run(() async {
     fakeVmServiceHost = FakeVmServiceHost(requests: <VmServiceExpectation>[
       listViews,
-      serveObservatory,
       listViews,
       listViews,
       FakeVmServiceRequest(
@@ -1219,7 +1198,6 @@
   testUsingContext('ResidentRunner Can handle an RPC exception from hot restart', () => testbed.run(() async {
     fakeVmServiceHost = FakeVmServiceHost(requests: <VmServiceExpectation>[
       listViews,
-      serveObservatory,
       listViews,
     ]);
     final Completer<DebugConnectionInfo> futureConnectionInfo = Completer<DebugConnectionInfo>.sync();
@@ -1656,7 +1634,6 @@
     fakeVmServiceHost = FakeVmServiceHost(requests: <VmServiceExpectation>[
       listViews,
       listViews,
-      serveObservatory,
     ]);
     residentRunner = ColdRunner(
       <FlutterDevice>[
@@ -1699,7 +1676,6 @@
   testUsingContext('HotRunner writes vm service file when providing debugging option', () => testbed.run(() async {
     fakeVmServiceHost = FakeVmServiceHost(requests: <VmServiceExpectation>[
       listViews,
-      serveObservatory,
       listViews,
     ], wsAddress: testUri);
     globals.fs.file(globals.fs.path.join('lib', 'main.dart')).createSync(recursive: true);
@@ -1722,7 +1698,6 @@
   testUsingContext('HotRunner copies compiled app.dill to cache during startup', () => testbed.run(() async {
     fakeVmServiceHost = FakeVmServiceHost(requests: <VmServiceExpectation>[
       listViews,
-      serveObservatory,
       listViews,
     ], wsAddress: testUri);
     globals.fs.file(globals.fs.path.join('lib', 'main.dart')).createSync(recursive: true);
@@ -1751,7 +1726,6 @@
   testUsingContext('HotRunner copies compiled app.dill to cache during startup with dart defines', () => testbed.run(() async {
     fakeVmServiceHost = FakeVmServiceHost(requests: <VmServiceExpectation>[
       listViews,
-      serveObservatory,
       listViews,
     ], wsAddress: testUri);
     globals.fs.file(globals.fs.path.join('lib', 'main.dart')).createSync(recursive: true);
@@ -1782,7 +1756,6 @@
   testUsingContext('HotRunner copies compiled app.dill to cache during startup with null safety', () => testbed.run(() async {
     fakeVmServiceHost = FakeVmServiceHost(requests: <VmServiceExpectation>[
       listViews,
-      serveObservatory,
       listViews,
     ], wsAddress: testUri);
     globals.fs.file(globals.fs.path.join('lib', 'main.dart')).createSync(recursive: true);
@@ -1813,7 +1786,6 @@
   testUsingContext('HotRunner copies compiled app.dill to cache during startup with track-widget-creation', () => testbed.run(() async {
     fakeVmServiceHost = FakeVmServiceHost(requests: <VmServiceExpectation>[
       listViews,
-      serveObservatory,
       listViews,
     ], wsAddress: testUri);
     globals.fs.file(globals.fs.path.join('lib', 'main.dart')).createSync(recursive: true);
@@ -1837,7 +1809,6 @@
   testUsingContext('HotRunner does not copy app.dill if a dillOutputPath is given', () => testbed.run(() async {
     fakeVmServiceHost = FakeVmServiceHost(requests: <VmServiceExpectation>[
       listViews,
-      serveObservatory,
       listViews,
     ], wsAddress: testUri);
     globals.fs.file(globals.fs.path.join('lib', 'main.dart')).createSync(recursive: true);
@@ -1861,7 +1832,6 @@
   testUsingContext('HotRunner copies compiled app.dill to cache during startup with --track-widget-creation', () => testbed.run(() async {
     fakeVmServiceHost = FakeVmServiceHost(requests: <VmServiceExpectation>[
       listViews,
-      serveObservatory,
       listViews,
     ], wsAddress: testUri);
     globals.fs.file(globals.fs.path.join('lib', 'main.dart')).createSync(recursive: true);
@@ -1889,7 +1859,6 @@
   testUsingContext('HotRunner calls device dispose', () => testbed.run(() async {
     fakeVmServiceHost = FakeVmServiceHost(requests: <VmServiceExpectation>[
       listViews,
-      serveObservatory,
       listViews,
     ], wsAddress: testUri);
     globals.fs.file(globals.fs.path.join('lib', 'main.dart')).createSync(recursive: true);
@@ -1910,7 +1879,6 @@
   testUsingContext('HotRunner handles failure to write vmservice file', () => testbed.run(() async {
     fakeVmServiceHost = FakeVmServiceHost(requests: <VmServiceExpectation>[
       listViews,
-      serveObservatory,
       listViews,
     ]);
     globals.fs.file(globals.fs.path.join('lib', 'main.dart')).createSync(recursive: true);
@@ -1935,7 +1903,6 @@
   testUsingContext('ColdRunner writes vm service file when providing debugging option', () => testbed.run(() async {
     fakeVmServiceHost = FakeVmServiceHost(requests: <VmServiceExpectation>[
       listViews,
-      serveObservatory,
     ], wsAddress: testUri);
     globals.fs.file(globals.fs.path.join('lib', 'main.dart')).createSync(recursive: true);
     residentRunner = ColdRunner(
diff --git a/packages/flutter_tools/test/integration.shard/flutter_attach_test.dart b/packages/flutter_tools/test/integration.shard/flutter_attach_test.dart
index 48bf091..a2621c4 100644
--- a/packages/flutter_tools/test/integration.shard/flutter_attach_test.dart
+++ b/packages/flutter_tools/test/integration.shard/flutter_attach_test.dart
@@ -2,8 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-import 'dart:convert';
-
 import 'package:file/file.dart';
 import 'package:flutter_tools/src/base/io.dart';
 import 'package:vm_service/vm_service.dart';
@@ -159,64 +157,4 @@
       expect(vmServiceUri.port, equals(ddsPort));
     });
   });
-
-  group('--serve-observatory', () {
-    late FlutterRunTestDriver flutterRun, flutterAttach;
-
-    setUp(() async {
-      flutterRun = FlutterRunTestDriver(tempDir,    logPrefix: '   RUN  ');
-      flutterAttach = FlutterRunTestDriver(
-        tempDir,
-        logPrefix: 'ATTACH  ',
-        // Only one DDS instance can be connected to the VM service at a time.
-        // DDS can also only initialize if the VM service doesn't have any existing
-        // clients, so we'll just let _flutterRun be responsible for spawning DDS.
-        spawnDdsInstance: false,
-      );
-    });
-
-    tearDown(() async {
-      await flutterAttach.detach();
-      await flutterRun.stop();
-    });
-
-    Future<bool> isObservatoryAvailable() async {
-      final HttpClient client = HttpClient();
-      final Uri vmServiceUri = Uri(
-        scheme: 'http',
-        host: flutterRun.vmServiceWsUri!.host,
-        port: flutterRun.vmServicePort,
-      );
-
-      final HttpClientRequest request = await client.getUrl(vmServiceUri);
-      final HttpClientResponse response = await request.close();
-      final String content = await response.transform(utf8.decoder).join();
-      return content.contains('Dart VM Observatory');
-    }
-
-    testWithoutContext('enables Observatory on run', () async {
-        await flutterRun.run(
-          withDebugger: true,
-          // TODO(bkonyi): uncomment once Observatory is disabled by default
-          // See https://github.com/dart-lang/sdk/issues/50233
-          // serveObservatory: true,
-        );
-        expect(await isObservatoryAvailable(), true);
-    });
-
-    testWithoutContext('enables Observatory on attach', () async {
-      await flutterRun.run(withDebugger: true, serveObservatory: false);
-      // Bail out if Observatory is still served by default in the VM.
-      if (await isObservatoryAvailable()) {
-        return;
-      }
-      await flutterAttach.attach(
-        flutterRun.vmServicePort!,
-        // TODO(bkonyi): uncomment once Observatory is disabled by default
-        // See https://github.com/dart-lang/sdk/issues/50233
-        // serveObservatory: true,
-      );
-      expect(await isObservatoryAvailable(), true);
-    });
-  });
 }
diff --git a/packages/flutter_tools/test/integration.shard/test_driver.dart b/packages/flutter_tools/test/integration.shard/test_driver.dart
index f233b37..4f3af30 100644
--- a/packages/flutter_tools/test/integration.shard/test_driver.dart
+++ b/packages/flutter_tools/test/integration.shard/test_driver.dart
@@ -499,7 +499,6 @@
     bool expressionEvaluation = true,
     bool structuredErrors = false,
     bool singleWidgetReloads = false,
-    bool serveObservatory = true,
     String? script,
     List<String>? additionalCommandArgs,
   }) async {
@@ -510,7 +509,6 @@
           '--disable-service-auth-codes',
         '--machine',
         if (!spawnDdsInstance) '--no-dds',
-        '--${serveObservatory ? '' : 'no-'}serve-observatory',
         ...getLocalEngineArguments(),
         '-d',
         if (chrome)
@@ -539,7 +537,6 @@
     bool startPaused = false,
     bool pauseOnExceptions = false,
     bool singleWidgetReloads = false,
-    bool serveObservatory = true,
     List<String>? additionalCommandArgs,
   }) async {
     _attachPort = port;
@@ -550,7 +547,6 @@
         '--machine',
         if (!spawnDdsInstance)
           '--no-dds',
-        '--${serveObservatory ? '' : 'no-'}serve-observatory',
         '-d',
         'flutter-tester',
         '--debug-port',
diff --git a/packages/flutter_tools/test/integration.shard/test_test.dart b/packages/flutter_tools/test/integration.shard/test_test.dart
index 03e1243..3e1e99c 100644
--- a/packages/flutter_tools/test/integration.shard/test_test.dart
+++ b/packages/flutter_tools/test/integration.shard/test_test.dart
@@ -198,31 +198,6 @@
   testWithoutContext('flutter gold skips tests where the expectations are missing', () async {
     return _testFile('flutter_gold', automatedTestsDirectory, flutterTestDirectory, exitCode: isZero);
   });
-
-  testWithoutContext('flutter test should respect --serve-observatory', () async {
-    late final Process process;
-    try {
-      process = await _runFlutterTestConcurrent('trivial', automatedTestsDirectory, flutterTestDirectory,
-        extraArguments: const <String>['--start-paused', '--serve-observatory']);
-      final Completer<Uri> completer = Completer<Uri>();
-      final RegExp vmServiceUriRegExp = RegExp(r'((http)?:\/\/)[^\s]+');
-      late final StreamSubscription<String> sub;
-      sub = process.stdout.transform(utf8.decoder).listen((String e) {
-        if (vmServiceUriRegExp.hasMatch(e)) {
-          completer.complete(Uri.parse(vmServiceUriRegExp.firstMatch(e)!.group(0)!));
-          sub.cancel();
-        }
-      });
-      final Uri vmServiceUri = await completer.future;
-      final HttpClient client = HttpClient();
-      final HttpClientRequest request = await client.getUrl(vmServiceUri);
-      final HttpClientResponse response = await request.close();
-      final String content = await response.transform(utf8.decoder).join();
-      expect(content.contains('Dart VM Observatory'), true);
-    } finally {
-      process.kill();
-    }
-  });
 }
 
 Future<void> _testFile(
@@ -353,45 +328,3 @@
     stderrEncoding: utf8,
   );
 }
-
-Future<Process> _runFlutterTestConcurrent(
-  String? testName,
-  String workingDirectory,
-  String testDirectory, {
-  List<String> extraArguments = const <String>[],
-}) async {
-
-  String testPath;
-  if (testName == null) {
-    // Test everything in the directory.
-    testPath = testDirectory;
-    final Directory directoryToTest = fileSystem.directory(testPath);
-    if (!directoryToTest.existsSync()) {
-      fail('missing test directory: $directoryToTest');
-    }
-  } else {
-    // Test just a specific test file.
-    testPath = fileSystem.path.join(testDirectory, '${testName}_test.dart');
-    final File testFile = fileSystem.file(testPath);
-    if (!testFile.existsSync()) {
-      fail('missing test file: $testFile');
-    }
-  }
-
-  final List<String> args = <String>[
-    'test',
-    '--no-color',
-    '--no-version-check',
-    '--no-pub',
-    '--reporter',
-    'compact',
-    ...extraArguments,
-    testPath,
-  ];
-
-  return Process.start(
-    flutterBin, // Uses the precompiled flutter tool for faster tests,
-    args,
-    workingDirectory: workingDirectory,
-  );
-}