diff --git a/.github/.OwlBot.yaml b/.github/.OwlBot.yaml
index 78e0d389..13004fad 100644
--- a/.github/.OwlBot.yaml
+++ b/.github/.OwlBot.yaml
@@ -17,11 +17,12 @@ docker:
 
 deep-remove-regex:
 - "/grpc-google-.*/src"
-- "/proto-google-.*/src"
+- "/proto-google-cloud.*/src"
 - "/google-.*/src"
 
 deep-preserve-regex:
 - "/google-.*/src/test/java/com/google/cloud/.*/v.*/it/IT.*Test.java"
+- "/proto-google-devtools-source-protos"
 
 deep-copy-regex:
 - source: "/google/devtools/clouddebugger/(v.*)/.*-java/proto-google-.*/src"
diff --git a/google-cloud-debugger-client/src/main/java/com/google/cloud/debugger/v2/Controller2Settings.java b/google-cloud-debugger-client/src/main/java/com/google/cloud/debugger/v2/Controller2Settings.java
index 15d3f66e..be9bd44b 100644
--- a/google-cloud-debugger-client/src/main/java/com/google/cloud/debugger/v2/Controller2Settings.java
+++ b/google-cloud-debugger-client/src/main/java/com/google/cloud/debugger/v2/Controller2Settings.java
@@ -173,14 +173,13 @@ public Controller2StubSettings.Builder getStubSettingsBuilder() {
       return ((Controller2StubSettings.Builder) getStubSettings());
     }
 
-    // NEXT_MAJOR_VER: remove 'throws Exception'.
     /**
      * Applies the given settings updater function to all of the unary API methods in this service.
      *
      * <p>Note: This method does not support applying settings to streaming methods.
      */
     public Builder applyToAllUnaryMethods(
-        ApiFunction<UnaryCallSettings.Builder<?, ?>, Void> settingsUpdater) throws Exception {
+        ApiFunction<UnaryCallSettings.Builder<?, ?>, Void> settingsUpdater) {
       super.applyToAllUnaryMethods(
           getStubSettingsBuilder().unaryMethodSettingsBuilders(), settingsUpdater);
       return this;
diff --git a/google-cloud-debugger-client/src/main/java/com/google/cloud/debugger/v2/Debugger2Settings.java b/google-cloud-debugger-client/src/main/java/com/google/cloud/debugger/v2/Debugger2Settings.java
index c136c6e3..a6fa934e 100644
--- a/google-cloud-debugger-client/src/main/java/com/google/cloud/debugger/v2/Debugger2Settings.java
+++ b/google-cloud-debugger-client/src/main/java/com/google/cloud/debugger/v2/Debugger2Settings.java
@@ -185,14 +185,13 @@ public Debugger2StubSettings.Builder getStubSettingsBuilder() {
       return ((Debugger2StubSettings.Builder) getStubSettings());
     }
 
-    // NEXT_MAJOR_VER: remove 'throws Exception'.
     /**
      * Applies the given settings updater function to all of the unary API methods in this service.
      *
      * <p>Note: This method does not support applying settings to streaming methods.
      */
     public Builder applyToAllUnaryMethods(
-        ApiFunction<UnaryCallSettings.Builder<?, ?>, Void> settingsUpdater) throws Exception {
+        ApiFunction<UnaryCallSettings.Builder<?, ?>, Void> settingsUpdater) {
       super.applyToAllUnaryMethods(
           getStubSettingsBuilder().unaryMethodSettingsBuilders(), settingsUpdater);
       return this;
diff --git a/google-cloud-debugger-client/src/main/java/com/google/cloud/debugger/v2/stub/Controller2StubSettings.java b/google-cloud-debugger-client/src/main/java/com/google/cloud/debugger/v2/stub/Controller2StubSettings.java
index 8d6ad467..736434e3 100644
--- a/google-cloud-debugger-client/src/main/java/com/google/cloud/debugger/v2/stub/Controller2StubSettings.java
+++ b/google-cloud-debugger-client/src/main/java/com/google/cloud/debugger/v2/stub/Controller2StubSettings.java
@@ -310,14 +310,13 @@ private static Builder initDefaults(Builder builder) {
       return builder;
     }
 
-    // NEXT_MAJOR_VER: remove 'throws Exception'.
     /**
      * Applies the given settings updater function to all of the unary API methods in this service.
      *
      * <p>Note: This method does not support applying settings to streaming methods.
      */
     public Builder applyToAllUnaryMethods(
-        ApiFunction<UnaryCallSettings.Builder<?, ?>, Void> settingsUpdater) throws Exception {
+        ApiFunction<UnaryCallSettings.Builder<?, ?>, Void> settingsUpdater) {
       super.applyToAllUnaryMethods(unaryMethodSettingsBuilders, settingsUpdater);
       return this;
     }
diff --git a/google-cloud-debugger-client/src/main/java/com/google/cloud/debugger/v2/stub/Debugger2StubSettings.java b/google-cloud-debugger-client/src/main/java/com/google/cloud/debugger/v2/stub/Debugger2StubSettings.java
index 8d062c17..6c6ab41a 100644
--- a/google-cloud-debugger-client/src/main/java/com/google/cloud/debugger/v2/stub/Debugger2StubSettings.java
+++ b/google-cloud-debugger-client/src/main/java/com/google/cloud/debugger/v2/stub/Debugger2StubSettings.java
@@ -345,14 +345,13 @@ private static Builder initDefaults(Builder builder) {
       return builder;
     }
 
-    // NEXT_MAJOR_VER: remove 'throws Exception'.
     /**
      * Applies the given settings updater function to all of the unary API methods in this service.
      *
      * <p>Note: This method does not support applying settings to streaming methods.
      */
     public Builder applyToAllUnaryMethods(
-        ApiFunction<UnaryCallSettings.Builder<?, ?>, Void> settingsUpdater) throws Exception {
+        ApiFunction<UnaryCallSettings.Builder<?, ?>, Void> settingsUpdater) {
       super.applyToAllUnaryMethods(unaryMethodSettingsBuilders, settingsUpdater);
       return this;
     }
diff --git a/google-cloud-debugger-client/src/main/java/com/google/cloud/debugger/v2/stub/GrpcController2Stub.java b/google-cloud-debugger-client/src/main/java/com/google/cloud/debugger/v2/stub/GrpcController2Stub.java
index 9354ca3d..7531c941 100644
--- a/google-cloud-debugger-client/src/main/java/com/google/cloud/debugger/v2/stub/GrpcController2Stub.java
+++ b/google-cloud-debugger-client/src/main/java/com/google/cloud/debugger/v2/stub/GrpcController2Stub.java
@@ -21,7 +21,6 @@
 import com.google.api.gax.grpc.GrpcCallSettings;
 import com.google.api.gax.grpc.GrpcStubCallableFactory;
 import com.google.api.gax.rpc.ClientContext;
-import com.google.api.gax.rpc.RequestParamsExtractor;
 import com.google.api.gax.rpc.UnaryCallable;
 import com.google.common.collect.ImmutableMap;
 import com.google.devtools.clouddebugger.v2.ListActiveBreakpointsRequest;
@@ -34,7 +33,6 @@
 import io.grpc.MethodDescriptor;
 import io.grpc.protobuf.ProtoUtils;
 import java.io.IOException;
-import java.util.Map;
 import java.util.concurrent.TimeUnit;
 import javax.annotation.Generated;
 
@@ -143,13 +141,10 @@ protected GrpcController2Stub(
                 .<ListActiveBreakpointsRequest, ListActiveBreakpointsResponse>newBuilder()
                 .setMethodDescriptor(listActiveBreakpointsMethodDescriptor)
                 .setParamsExtractor(
-                    new RequestParamsExtractor<ListActiveBreakpointsRequest>() {
-                      @Override
-                      public Map<String, String> extract(ListActiveBreakpointsRequest request) {
-                        ImmutableMap.Builder<String, String> params = ImmutableMap.builder();
-                        params.put("debuggee_id", String.valueOf(request.getDebuggeeId()));
-                        return params.build();
-                      }
+                    request -> {
+                      ImmutableMap.Builder<String, String> params = ImmutableMap.builder();
+                      params.put("debuggee_id", String.valueOf(request.getDebuggeeId()));
+                      return params.build();
                     })
                 .build();
     GrpcCallSettings<UpdateActiveBreakpointRequest, UpdateActiveBreakpointResponse>
@@ -158,15 +153,11 @@ public Map<String, String> extract(ListActiveBreakpointsRequest request) {
                 .<UpdateActiveBreakpointRequest, UpdateActiveBreakpointResponse>newBuilder()
                 .setMethodDescriptor(updateActiveBreakpointMethodDescriptor)
                 .setParamsExtractor(
-                    new RequestParamsExtractor<UpdateActiveBreakpointRequest>() {
-                      @Override
-                      public Map<String, String> extract(UpdateActiveBreakpointRequest request) {
-                        ImmutableMap.Builder<String, String> params = ImmutableMap.builder();
-                        params.put(
-                            "breakpoint.id", String.valueOf(request.getBreakpoint().getId()));
-                        params.put("debuggee_id", String.valueOf(request.getDebuggeeId()));
-                        return params.build();
-                      }
+                    request -> {
+                      ImmutableMap.Builder<String, String> params = ImmutableMap.builder();
+                      params.put("breakpoint.id", String.valueOf(request.getBreakpoint().getId()));
+                      params.put("debuggee_id", String.valueOf(request.getDebuggeeId()));
+                      return params.build();
                     })
                 .build();
 
@@ -212,7 +203,13 @@ public GrpcOperationsStub getOperationsStub() {
 
   @Override
   public final void close() {
-    shutdown();
+    try {
+      backgroundResources.close();
+    } catch (RuntimeException e) {
+      throw e;
+    } catch (Exception e) {
+      throw new IllegalStateException("Failed to close resource", e);
+    }
   }
 
   @Override
diff --git a/google-cloud-debugger-client/src/main/java/com/google/cloud/debugger/v2/stub/GrpcDebugger2Stub.java b/google-cloud-debugger-client/src/main/java/com/google/cloud/debugger/v2/stub/GrpcDebugger2Stub.java
index 53fc8997..192ac799 100644
--- a/google-cloud-debugger-client/src/main/java/com/google/cloud/debugger/v2/stub/GrpcDebugger2Stub.java
+++ b/google-cloud-debugger-client/src/main/java/com/google/cloud/debugger/v2/stub/GrpcDebugger2Stub.java
@@ -21,7 +21,6 @@
 import com.google.api.gax.grpc.GrpcCallSettings;
 import com.google.api.gax.grpc.GrpcStubCallableFactory;
 import com.google.api.gax.rpc.ClientContext;
-import com.google.api.gax.rpc.RequestParamsExtractor;
 import com.google.api.gax.rpc.UnaryCallable;
 import com.google.common.collect.ImmutableMap;
 import com.google.devtools.clouddebugger.v2.DeleteBreakpointRequest;
@@ -38,7 +37,6 @@
 import io.grpc.MethodDescriptor;
 import io.grpc.protobuf.ProtoUtils;
 import java.io.IOException;
-import java.util.Map;
 import java.util.concurrent.TimeUnit;
 import javax.annotation.Generated;
 
@@ -156,41 +154,32 @@ protected GrpcDebugger2Stub(
         GrpcCallSettings.<SetBreakpointRequest, SetBreakpointResponse>newBuilder()
             .setMethodDescriptor(setBreakpointMethodDescriptor)
             .setParamsExtractor(
-                new RequestParamsExtractor<SetBreakpointRequest>() {
-                  @Override
-                  public Map<String, String> extract(SetBreakpointRequest request) {
-                    ImmutableMap.Builder<String, String> params = ImmutableMap.builder();
-                    params.put("debuggee_id", String.valueOf(request.getDebuggeeId()));
-                    return params.build();
-                  }
+                request -> {
+                  ImmutableMap.Builder<String, String> params = ImmutableMap.builder();
+                  params.put("debuggee_id", String.valueOf(request.getDebuggeeId()));
+                  return params.build();
                 })
             .build();
     GrpcCallSettings<GetBreakpointRequest, GetBreakpointResponse> getBreakpointTransportSettings =
         GrpcCallSettings.<GetBreakpointRequest, GetBreakpointResponse>newBuilder()
             .setMethodDescriptor(getBreakpointMethodDescriptor)
             .setParamsExtractor(
-                new RequestParamsExtractor<GetBreakpointRequest>() {
-                  @Override
-                  public Map<String, String> extract(GetBreakpointRequest request) {
-                    ImmutableMap.Builder<String, String> params = ImmutableMap.builder();
-                    params.put("breakpoint_id", String.valueOf(request.getBreakpointId()));
-                    params.put("debuggee_id", String.valueOf(request.getDebuggeeId()));
-                    return params.build();
-                  }
+                request -> {
+                  ImmutableMap.Builder<String, String> params = ImmutableMap.builder();
+                  params.put("breakpoint_id", String.valueOf(request.getBreakpointId()));
+                  params.put("debuggee_id", String.valueOf(request.getDebuggeeId()));
+                  return params.build();
                 })
             .build();
     GrpcCallSettings<DeleteBreakpointRequest, Empty> deleteBreakpointTransportSettings =
         GrpcCallSettings.<DeleteBreakpointRequest, Empty>newBuilder()
             .setMethodDescriptor(deleteBreakpointMethodDescriptor)
             .setParamsExtractor(
-                new RequestParamsExtractor<DeleteBreakpointRequest>() {
-                  @Override
-                  public Map<String, String> extract(DeleteBreakpointRequest request) {
-                    ImmutableMap.Builder<String, String> params = ImmutableMap.builder();
-                    params.put("breakpoint_id", String.valueOf(request.getBreakpointId()));
-                    params.put("debuggee_id", String.valueOf(request.getDebuggeeId()));
-                    return params.build();
-                  }
+                request -> {
+                  ImmutableMap.Builder<String, String> params = ImmutableMap.builder();
+                  params.put("breakpoint_id", String.valueOf(request.getBreakpointId()));
+                  params.put("debuggee_id", String.valueOf(request.getDebuggeeId()));
+                  return params.build();
                 })
             .build();
     GrpcCallSettings<ListBreakpointsRequest, ListBreakpointsResponse>
@@ -198,13 +187,10 @@ public Map<String, String> extract(DeleteBreakpointRequest request) {
             GrpcCallSettings.<ListBreakpointsRequest, ListBreakpointsResponse>newBuilder()
                 .setMethodDescriptor(listBreakpointsMethodDescriptor)
                 .setParamsExtractor(
-                    new RequestParamsExtractor<ListBreakpointsRequest>() {
-                      @Override
-                      public Map<String, String> extract(ListBreakpointsRequest request) {
-                        ImmutableMap.Builder<String, String> params = ImmutableMap.builder();
-                        params.put("debuggee_id", String.valueOf(request.getDebuggeeId()));
-                        return params.build();
-                      }
+                    request -> {
+                      ImmutableMap.Builder<String, String> params = ImmutableMap.builder();
+                      params.put("debuggee_id", String.valueOf(request.getDebuggeeId()));
+                      return params.build();
                     })
                 .build();
     GrpcCallSettings<ListDebuggeesRequest, ListDebuggeesResponse> listDebuggeesTransportSettings =
@@ -263,7 +249,13 @@ public UnaryCallable<ListDebuggeesRequest, ListDebuggeesResponse> listDebuggeesC
 
   @Override
   public final void close() {
-    shutdown();
+    try {
+      backgroundResources.close();
+    } catch (RuntimeException e) {
+      throw e;
+    } catch (Exception e) {
+      throw new IllegalStateException("Failed to close resource", e);
+    }
   }
 
   @Override