diff --git a/src/v3/agents_client.ts b/src/v3/agents_client.ts
index 7fcff1e2..053f07c2 100644
--- a/src/v3/agents_client.ts
+++ b/src/v3/agents_client.ts
@@ -49,6 +49,7 @@ const version = require('../../../package.json').version;
 export class AgentsClient {
   private _terminated = false;
   private _opts: ClientOptions;
+  private _providedCustomServicePath: boolean;
   private _gaxModule: typeof gax | typeof gax.fallback;
   private _gaxGrpc: gax.GrpcClient | gax.fallback.GrpcClient;
   private _protos: {};
@@ -60,6 +61,7 @@ export class AgentsClient {
     longrunning: {},
     batching: {},
   };
+  warn: (code: string, message: string, warnType?: string) => void;
   innerApiCalls: {[name: string]: Function};
   pathTemplates: {[name: string]: gax.PathTemplate};
   operationsClient: gax.OperationsClient;
@@ -104,6 +106,9 @@ export class AgentsClient {
     const staticMembers = this.constructor as typeof AgentsClient;
     const servicePath =
       opts?.servicePath || opts?.apiEndpoint || staticMembers.servicePath;
+    this._providedCustomServicePath = !!(
+      opts?.servicePath || opts?.apiEndpoint
+    );
     const port = opts?.port || staticMembers.port;
     const clientConfig = opts?.clientConfig ?? {};
     const fallback =
@@ -280,6 +285,9 @@ export class AgentsClient {
     // of calling the API is handled in `google-gax`, with this code
     // merely providing the destination and request information.
     this.innerApiCalls = {};
+
+    // Add a warn function to the client constructor so it can be easily tested.
+    this.warn = gax.warn;
   }
 
   /**
@@ -308,7 +316,8 @@ export class AgentsClient {
           )
         : // eslint-disable-next-line @typescript-eslint/no-explicit-any
           (this._protos as any).google.cloud.dialogflow.cx.v3.Agents,
-      this._opts
+      this._opts,
+      this._providedCustomServicePath
     ) as Promise<{[method: string]: Function}>;
 
     // Iterate over each of the methods that the service provides
diff --git a/src/v3/entity_types_client.ts b/src/v3/entity_types_client.ts
index f5ed2070..cfc0d2ee 100644
--- a/src/v3/entity_types_client.ts
+++ b/src/v3/entity_types_client.ts
@@ -48,6 +48,7 @@ const version = require('../../../package.json').version;
 export class EntityTypesClient {
   private _terminated = false;
   private _opts: ClientOptions;
+  private _providedCustomServicePath: boolean;
   private _gaxModule: typeof gax | typeof gax.fallback;
   private _gaxGrpc: gax.GrpcClient | gax.fallback.GrpcClient;
   private _protos: {};
@@ -59,6 +60,7 @@ export class EntityTypesClient {
     longrunning: {},
     batching: {},
   };
+  warn: (code: string, message: string, warnType?: string) => void;
   innerApiCalls: {[name: string]: Function};
   pathTemplates: {[name: string]: gax.PathTemplate};
   entityTypesStub?: Promise<{[name: string]: Function}>;
@@ -102,6 +104,9 @@ export class EntityTypesClient {
     const staticMembers = this.constructor as typeof EntityTypesClient;
     const servicePath =
       opts?.servicePath || opts?.apiEndpoint || staticMembers.servicePath;
+    this._providedCustomServicePath = !!(
+      opts?.servicePath || opts?.apiEndpoint
+    );
     const port = opts?.port || staticMembers.port;
     const clientConfig = opts?.clientConfig ?? {};
     const fallback =
@@ -240,6 +245,9 @@ export class EntityTypesClient {
     // of calling the API is handled in `google-gax`, with this code
     // merely providing the destination and request information.
     this.innerApiCalls = {};
+
+    // Add a warn function to the client constructor so it can be easily tested.
+    this.warn = gax.warn;
   }
 
   /**
@@ -268,7 +276,8 @@ export class EntityTypesClient {
           )
         : // eslint-disable-next-line @typescript-eslint/no-explicit-any
           (this._protos as any).google.cloud.dialogflow.cx.v3.EntityTypes,
-      this._opts
+      this._opts,
+      this._providedCustomServicePath
     ) as Promise<{[method: string]: Function}>;
 
     // Iterate over each of the methods that the service provides
diff --git a/src/v3/environments_client.ts b/src/v3/environments_client.ts
index 74688f1f..c1b42f89 100644
--- a/src/v3/environments_client.ts
+++ b/src/v3/environments_client.ts
@@ -49,6 +49,7 @@ const version = require('../../../package.json').version;
 export class EnvironmentsClient {
   private _terminated = false;
   private _opts: ClientOptions;
+  private _providedCustomServicePath: boolean;
   private _gaxModule: typeof gax | typeof gax.fallback;
   private _gaxGrpc: gax.GrpcClient | gax.fallback.GrpcClient;
   private _protos: {};
@@ -60,6 +61,7 @@ export class EnvironmentsClient {
     longrunning: {},
     batching: {},
   };
+  warn: (code: string, message: string, warnType?: string) => void;
   innerApiCalls: {[name: string]: Function};
   pathTemplates: {[name: string]: gax.PathTemplate};
   operationsClient: gax.OperationsClient;
@@ -104,6 +106,9 @@ export class EnvironmentsClient {
     const staticMembers = this.constructor as typeof EnvironmentsClient;
     const servicePath =
       opts?.servicePath || opts?.apiEndpoint || staticMembers.servicePath;
+    this._providedCustomServicePath = !!(
+      opts?.servicePath || opts?.apiEndpoint
+    );
     const port = opts?.port || staticMembers.port;
     const clientConfig = opts?.clientConfig ?? {};
     const fallback =
@@ -301,6 +306,9 @@ export class EnvironmentsClient {
     // of calling the API is handled in `google-gax`, with this code
     // merely providing the destination and request information.
     this.innerApiCalls = {};
+
+    // Add a warn function to the client constructor so it can be easily tested.
+    this.warn = gax.warn;
   }
 
   /**
@@ -329,7 +337,8 @@ export class EnvironmentsClient {
           )
         : // eslint-disable-next-line @typescript-eslint/no-explicit-any
           (this._protos as any).google.cloud.dialogflow.cx.v3.Environments,
-      this._opts
+      this._opts,
+      this._providedCustomServicePath
     ) as Promise<{[method: string]: Function}>;
 
     // Iterate over each of the methods that the service provides
diff --git a/src/v3/experiments_client.ts b/src/v3/experiments_client.ts
index d71ee167..294c9809 100644
--- a/src/v3/experiments_client.ts
+++ b/src/v3/experiments_client.ts
@@ -48,6 +48,7 @@ const version = require('../../../package.json').version;
 export class ExperimentsClient {
   private _terminated = false;
   private _opts: ClientOptions;
+  private _providedCustomServicePath: boolean;
   private _gaxModule: typeof gax | typeof gax.fallback;
   private _gaxGrpc: gax.GrpcClient | gax.fallback.GrpcClient;
   private _protos: {};
@@ -59,6 +60,7 @@ export class ExperimentsClient {
     longrunning: {},
     batching: {},
   };
+  warn: (code: string, message: string, warnType?: string) => void;
   innerApiCalls: {[name: string]: Function};
   pathTemplates: {[name: string]: gax.PathTemplate};
   experimentsStub?: Promise<{[name: string]: Function}>;
@@ -102,6 +104,9 @@ export class ExperimentsClient {
     const staticMembers = this.constructor as typeof ExperimentsClient;
     const servicePath =
       opts?.servicePath || opts?.apiEndpoint || staticMembers.servicePath;
+    this._providedCustomServicePath = !!(
+      opts?.servicePath || opts?.apiEndpoint
+    );
     const port = opts?.port || staticMembers.port;
     const clientConfig = opts?.clientConfig ?? {};
     const fallback =
@@ -240,6 +245,9 @@ export class ExperimentsClient {
     // of calling the API is handled in `google-gax`, with this code
     // merely providing the destination and request information.
     this.innerApiCalls = {};
+
+    // Add a warn function to the client constructor so it can be easily tested.
+    this.warn = gax.warn;
   }
 
   /**
@@ -268,7 +276,8 @@ export class ExperimentsClient {
           )
         : // eslint-disable-next-line @typescript-eslint/no-explicit-any
           (this._protos as any).google.cloud.dialogflow.cx.v3.Experiments,
-      this._opts
+      this._opts,
+      this._providedCustomServicePath
     ) as Promise<{[method: string]: Function}>;
 
     // Iterate over each of the methods that the service provides
diff --git a/src/v3/flows_client.ts b/src/v3/flows_client.ts
index ff451abe..d5b95824 100644
--- a/src/v3/flows_client.ts
+++ b/src/v3/flows_client.ts
@@ -49,6 +49,7 @@ const version = require('../../../package.json').version;
 export class FlowsClient {
   private _terminated = false;
   private _opts: ClientOptions;
+  private _providedCustomServicePath: boolean;
   private _gaxModule: typeof gax | typeof gax.fallback;
   private _gaxGrpc: gax.GrpcClient | gax.fallback.GrpcClient;
   private _protos: {};
@@ -60,6 +61,7 @@ export class FlowsClient {
     longrunning: {},
     batching: {},
   };
+  warn: (code: string, message: string, warnType?: string) => void;
   innerApiCalls: {[name: string]: Function};
   pathTemplates: {[name: string]: gax.PathTemplate};
   operationsClient: gax.OperationsClient;
@@ -104,6 +106,9 @@ export class FlowsClient {
     const staticMembers = this.constructor as typeof FlowsClient;
     const servicePath =
       opts?.servicePath || opts?.apiEndpoint || staticMembers.servicePath;
+    this._providedCustomServicePath = !!(
+      opts?.servicePath || opts?.apiEndpoint
+    );
     const port = opts?.port || staticMembers.port;
     const clientConfig = opts?.clientConfig ?? {};
     const fallback =
@@ -291,6 +296,9 @@ export class FlowsClient {
     // of calling the API is handled in `google-gax`, with this code
     // merely providing the destination and request information.
     this.innerApiCalls = {};
+
+    // Add a warn function to the client constructor so it can be easily tested.
+    this.warn = gax.warn;
   }
 
   /**
@@ -319,7 +327,8 @@ export class FlowsClient {
           )
         : // eslint-disable-next-line @typescript-eslint/no-explicit-any
           (this._protos as any).google.cloud.dialogflow.cx.v3.Flows,
-      this._opts
+      this._opts,
+      this._providedCustomServicePath
     ) as Promise<{[method: string]: Function}>;
 
     // Iterate over each of the methods that the service provides
diff --git a/src/v3/intents_client.ts b/src/v3/intents_client.ts
index d16d5d7b..97995100 100644
--- a/src/v3/intents_client.ts
+++ b/src/v3/intents_client.ts
@@ -48,6 +48,7 @@ const version = require('../../../package.json').version;
 export class IntentsClient {
   private _terminated = false;
   private _opts: ClientOptions;
+  private _providedCustomServicePath: boolean;
   private _gaxModule: typeof gax | typeof gax.fallback;
   private _gaxGrpc: gax.GrpcClient | gax.fallback.GrpcClient;
   private _protos: {};
@@ -59,6 +60,7 @@ export class IntentsClient {
     longrunning: {},
     batching: {},
   };
+  warn: (code: string, message: string, warnType?: string) => void;
   innerApiCalls: {[name: string]: Function};
   pathTemplates: {[name: string]: gax.PathTemplate};
   intentsStub?: Promise<{[name: string]: Function}>;
@@ -102,6 +104,9 @@ export class IntentsClient {
     const staticMembers = this.constructor as typeof IntentsClient;
     const servicePath =
       opts?.servicePath || opts?.apiEndpoint || staticMembers.servicePath;
+    this._providedCustomServicePath = !!(
+      opts?.servicePath || opts?.apiEndpoint
+    );
     const port = opts?.port || staticMembers.port;
     const clientConfig = opts?.clientConfig ?? {};
     const fallback =
@@ -240,6 +245,9 @@ export class IntentsClient {
     // of calling the API is handled in `google-gax`, with this code
     // merely providing the destination and request information.
     this.innerApiCalls = {};
+
+    // Add a warn function to the client constructor so it can be easily tested.
+    this.warn = gax.warn;
   }
 
   /**
@@ -268,7 +276,8 @@ export class IntentsClient {
           )
         : // eslint-disable-next-line @typescript-eslint/no-explicit-any
           (this._protos as any).google.cloud.dialogflow.cx.v3.Intents,
-      this._opts
+      this._opts,
+      this._providedCustomServicePath
     ) as Promise<{[method: string]: Function}>;
 
     // Iterate over each of the methods that the service provides
diff --git a/src/v3/pages_client.ts b/src/v3/pages_client.ts
index b73534b8..7e7f9a3a 100644
--- a/src/v3/pages_client.ts
+++ b/src/v3/pages_client.ts
@@ -48,6 +48,7 @@ const version = require('../../../package.json').version;
 export class PagesClient {
   private _terminated = false;
   private _opts: ClientOptions;
+  private _providedCustomServicePath: boolean;
   private _gaxModule: typeof gax | typeof gax.fallback;
   private _gaxGrpc: gax.GrpcClient | gax.fallback.GrpcClient;
   private _protos: {};
@@ -59,6 +60,7 @@ export class PagesClient {
     longrunning: {},
     batching: {},
   };
+  warn: (code: string, message: string, warnType?: string) => void;
   innerApiCalls: {[name: string]: Function};
   pathTemplates: {[name: string]: gax.PathTemplate};
   pagesStub?: Promise<{[name: string]: Function}>;
@@ -102,6 +104,9 @@ export class PagesClient {
     const staticMembers = this.constructor as typeof PagesClient;
     const servicePath =
       opts?.servicePath || opts?.apiEndpoint || staticMembers.servicePath;
+    this._providedCustomServicePath = !!(
+      opts?.servicePath || opts?.apiEndpoint
+    );
     const port = opts?.port || staticMembers.port;
     const clientConfig = opts?.clientConfig ?? {};
     const fallback =
@@ -240,6 +245,9 @@ export class PagesClient {
     // of calling the API is handled in `google-gax`, with this code
     // merely providing the destination and request information.
     this.innerApiCalls = {};
+
+    // Add a warn function to the client constructor so it can be easily tested.
+    this.warn = gax.warn;
   }
 
   /**
@@ -268,7 +276,8 @@ export class PagesClient {
           )
         : // eslint-disable-next-line @typescript-eslint/no-explicit-any
           (this._protos as any).google.cloud.dialogflow.cx.v3.Pages,
-      this._opts
+      this._opts,
+      this._providedCustomServicePath
     ) as Promise<{[method: string]: Function}>;
 
     // Iterate over each of the methods that the service provides
diff --git a/src/v3/security_settings_service_client.ts b/src/v3/security_settings_service_client.ts
index ee3cc4c9..199dfd63 100644
--- a/src/v3/security_settings_service_client.ts
+++ b/src/v3/security_settings_service_client.ts
@@ -48,6 +48,7 @@ const version = require('../../../package.json').version;
 export class SecuritySettingsServiceClient {
   private _terminated = false;
   private _opts: ClientOptions;
+  private _providedCustomServicePath: boolean;
   private _gaxModule: typeof gax | typeof gax.fallback;
   private _gaxGrpc: gax.GrpcClient | gax.fallback.GrpcClient;
   private _protos: {};
@@ -59,6 +60,7 @@ export class SecuritySettingsServiceClient {
     longrunning: {},
     batching: {},
   };
+  warn: (code: string, message: string, warnType?: string) => void;
   innerApiCalls: {[name: string]: Function};
   pathTemplates: {[name: string]: gax.PathTemplate};
   securitySettingsServiceStub?: Promise<{[name: string]: Function}>;
@@ -103,6 +105,9 @@ export class SecuritySettingsServiceClient {
       .constructor as typeof SecuritySettingsServiceClient;
     const servicePath =
       opts?.servicePath || opts?.apiEndpoint || staticMembers.servicePath;
+    this._providedCustomServicePath = !!(
+      opts?.servicePath || opts?.apiEndpoint
+    );
     const port = opts?.port || staticMembers.port;
     const clientConfig = opts?.clientConfig ?? {};
     const fallback =
@@ -241,6 +246,9 @@ export class SecuritySettingsServiceClient {
     // of calling the API is handled in `google-gax`, with this code
     // merely providing the destination and request information.
     this.innerApiCalls = {};
+
+    // Add a warn function to the client constructor so it can be easily tested.
+    this.warn = gax.warn;
   }
 
   /**
@@ -270,7 +278,8 @@ export class SecuritySettingsServiceClient {
         : // eslint-disable-next-line @typescript-eslint/no-explicit-any
           (this._protos as any).google.cloud.dialogflow.cx.v3
             .SecuritySettingsService,
-      this._opts
+      this._opts,
+      this._providedCustomServicePath
     ) as Promise<{[method: string]: Function}>;
 
     // Iterate over each of the methods that the service provides
diff --git a/src/v3/session_entity_types_client.ts b/src/v3/session_entity_types_client.ts
index 0a64fe6c..022e8264 100644
--- a/src/v3/session_entity_types_client.ts
+++ b/src/v3/session_entity_types_client.ts
@@ -48,6 +48,7 @@ const version = require('../../../package.json').version;
 export class SessionEntityTypesClient {
   private _terminated = false;
   private _opts: ClientOptions;
+  private _providedCustomServicePath: boolean;
   private _gaxModule: typeof gax | typeof gax.fallback;
   private _gaxGrpc: gax.GrpcClient | gax.fallback.GrpcClient;
   private _protos: {};
@@ -59,6 +60,7 @@ export class SessionEntityTypesClient {
     longrunning: {},
     batching: {},
   };
+  warn: (code: string, message: string, warnType?: string) => void;
   innerApiCalls: {[name: string]: Function};
   pathTemplates: {[name: string]: gax.PathTemplate};
   sessionEntityTypesStub?: Promise<{[name: string]: Function}>;
@@ -102,6 +104,9 @@ export class SessionEntityTypesClient {
     const staticMembers = this.constructor as typeof SessionEntityTypesClient;
     const servicePath =
       opts?.servicePath || opts?.apiEndpoint || staticMembers.servicePath;
+    this._providedCustomServicePath = !!(
+      opts?.servicePath || opts?.apiEndpoint
+    );
     const port = opts?.port || staticMembers.port;
     const clientConfig = opts?.clientConfig ?? {};
     const fallback =
@@ -243,6 +248,9 @@ export class SessionEntityTypesClient {
     // of calling the API is handled in `google-gax`, with this code
     // merely providing the destination and request information.
     this.innerApiCalls = {};
+
+    // Add a warn function to the client constructor so it can be easily tested.
+    this.warn = gax.warn;
   }
 
   /**
@@ -272,7 +280,8 @@ export class SessionEntityTypesClient {
         : // eslint-disable-next-line @typescript-eslint/no-explicit-any
           (this._protos as any).google.cloud.dialogflow.cx.v3
             .SessionEntityTypes,
-      this._opts
+      this._opts,
+      this._providedCustomServicePath
     ) as Promise<{[method: string]: Function}>;
 
     // Iterate over each of the methods that the service provides
diff --git a/src/v3/sessions_client.ts b/src/v3/sessions_client.ts
index 151f13a5..7e6d4daf 100644
--- a/src/v3/sessions_client.ts
+++ b/src/v3/sessions_client.ts
@@ -41,6 +41,7 @@ const version = require('../../../package.json').version;
 export class SessionsClient {
   private _terminated = false;
   private _opts: ClientOptions;
+  private _providedCustomServicePath: boolean;
   private _gaxModule: typeof gax | typeof gax.fallback;
   private _gaxGrpc: gax.GrpcClient | gax.fallback.GrpcClient;
   private _protos: {};
@@ -52,6 +53,7 @@ export class SessionsClient {
     longrunning: {},
     batching: {},
   };
+  warn: (code: string, message: string, warnType?: string) => void;
   innerApiCalls: {[name: string]: Function};
   pathTemplates: {[name: string]: gax.PathTemplate};
   sessionsStub?: Promise<{[name: string]: Function}>;
@@ -95,6 +97,9 @@ export class SessionsClient {
     const staticMembers = this.constructor as typeof SessionsClient;
     const servicePath =
       opts?.servicePath || opts?.apiEndpoint || staticMembers.servicePath;
+    this._providedCustomServicePath = !!(
+      opts?.servicePath || opts?.apiEndpoint
+    );
     const port = opts?.port || staticMembers.port;
     const clientConfig = opts?.clientConfig ?? {};
     const fallback =
@@ -231,6 +236,9 @@ export class SessionsClient {
     // of calling the API is handled in `google-gax`, with this code
     // merely providing the destination and request information.
     this.innerApiCalls = {};
+
+    // Add a warn function to the client constructor so it can be easily tested.
+    this.warn = gax.warn;
   }
 
   /**
@@ -259,7 +267,8 @@ export class SessionsClient {
           )
         : // eslint-disable-next-line @typescript-eslint/no-explicit-any
           (this._protos as any).google.cloud.dialogflow.cx.v3.Sessions,
-      this._opts
+      this._opts,
+      this._providedCustomServicePath
     ) as Promise<{[method: string]: Function}>;
 
     // Iterate over each of the methods that the service provides
diff --git a/src/v3/test_cases_client.ts b/src/v3/test_cases_client.ts
index 239a4768..4649f2a3 100644
--- a/src/v3/test_cases_client.ts
+++ b/src/v3/test_cases_client.ts
@@ -50,6 +50,7 @@ const version = require('../../../package.json').version;
 export class TestCasesClient {
   private _terminated = false;
   private _opts: ClientOptions;
+  private _providedCustomServicePath: boolean;
   private _gaxModule: typeof gax | typeof gax.fallback;
   private _gaxGrpc: gax.GrpcClient | gax.fallback.GrpcClient;
   private _protos: {};
@@ -61,6 +62,7 @@ export class TestCasesClient {
     longrunning: {},
     batching: {},
   };
+  warn: (code: string, message: string, warnType?: string) => void;
   innerApiCalls: {[name: string]: Function};
   pathTemplates: {[name: string]: gax.PathTemplate};
   operationsClient: gax.OperationsClient;
@@ -105,6 +107,9 @@ export class TestCasesClient {
     const staticMembers = this.constructor as typeof TestCasesClient;
     const servicePath =
       opts?.servicePath || opts?.apiEndpoint || staticMembers.servicePath;
+    this._providedCustomServicePath = !!(
+      opts?.servicePath || opts?.apiEndpoint
+    );
     const port = opts?.port || staticMembers.port;
     const clientConfig = opts?.clientConfig ?? {};
     const fallback =
@@ -308,6 +313,9 @@ export class TestCasesClient {
     // of calling the API is handled in `google-gax`, with this code
     // merely providing the destination and request information.
     this.innerApiCalls = {};
+
+    // Add a warn function to the client constructor so it can be easily tested.
+    this.warn = gax.warn;
   }
 
   /**
@@ -336,7 +344,8 @@ export class TestCasesClient {
           )
         : // eslint-disable-next-line @typescript-eslint/no-explicit-any
           (this._protos as any).google.cloud.dialogflow.cx.v3.TestCases,
-      this._opts
+      this._opts,
+      this._providedCustomServicePath
     ) as Promise<{[method: string]: Function}>;
 
     // Iterate over each of the methods that the service provides
diff --git a/src/v3/transition_route_groups_client.ts b/src/v3/transition_route_groups_client.ts
index c2acd49c..eb94f77e 100644
--- a/src/v3/transition_route_groups_client.ts
+++ b/src/v3/transition_route_groups_client.ts
@@ -48,6 +48,7 @@ const version = require('../../../package.json').version;
 export class TransitionRouteGroupsClient {
   private _terminated = false;
   private _opts: ClientOptions;
+  private _providedCustomServicePath: boolean;
   private _gaxModule: typeof gax | typeof gax.fallback;
   private _gaxGrpc: gax.GrpcClient | gax.fallback.GrpcClient;
   private _protos: {};
@@ -59,6 +60,7 @@ export class TransitionRouteGroupsClient {
     longrunning: {},
     batching: {},
   };
+  warn: (code: string, message: string, warnType?: string) => void;
   innerApiCalls: {[name: string]: Function};
   pathTemplates: {[name: string]: gax.PathTemplate};
   transitionRouteGroupsStub?: Promise<{[name: string]: Function}>;
@@ -103,6 +105,9 @@ export class TransitionRouteGroupsClient {
       .constructor as typeof TransitionRouteGroupsClient;
     const servicePath =
       opts?.servicePath || opts?.apiEndpoint || staticMembers.servicePath;
+    this._providedCustomServicePath = !!(
+      opts?.servicePath || opts?.apiEndpoint
+    );
     const port = opts?.port || staticMembers.port;
     const clientConfig = opts?.clientConfig ?? {};
     const fallback =
@@ -241,6 +246,9 @@ export class TransitionRouteGroupsClient {
     // of calling the API is handled in `google-gax`, with this code
     // merely providing the destination and request information.
     this.innerApiCalls = {};
+
+    // Add a warn function to the client constructor so it can be easily tested.
+    this.warn = gax.warn;
   }
 
   /**
@@ -270,7 +278,8 @@ export class TransitionRouteGroupsClient {
         : // eslint-disable-next-line @typescript-eslint/no-explicit-any
           (this._protos as any).google.cloud.dialogflow.cx.v3
             .TransitionRouteGroups,
-      this._opts
+      this._opts,
+      this._providedCustomServicePath
     ) as Promise<{[method: string]: Function}>;
 
     // Iterate over each of the methods that the service provides
diff --git a/src/v3/versions_client.ts b/src/v3/versions_client.ts
index a312c2bb..2ae84471 100644
--- a/src/v3/versions_client.ts
+++ b/src/v3/versions_client.ts
@@ -49,6 +49,7 @@ const version = require('../../../package.json').version;
 export class VersionsClient {
   private _terminated = false;
   private _opts: ClientOptions;
+  private _providedCustomServicePath: boolean;
   private _gaxModule: typeof gax | typeof gax.fallback;
   private _gaxGrpc: gax.GrpcClient | gax.fallback.GrpcClient;
   private _protos: {};
@@ -60,6 +61,7 @@ export class VersionsClient {
     longrunning: {},
     batching: {},
   };
+  warn: (code: string, message: string, warnType?: string) => void;
   innerApiCalls: {[name: string]: Function};
   pathTemplates: {[name: string]: gax.PathTemplate};
   operationsClient: gax.OperationsClient;
@@ -104,6 +106,9 @@ export class VersionsClient {
     const staticMembers = this.constructor as typeof VersionsClient;
     const servicePath =
       opts?.servicePath || opts?.apiEndpoint || staticMembers.servicePath;
+    this._providedCustomServicePath = !!(
+      opts?.servicePath || opts?.apiEndpoint
+    );
     const port = opts?.port || staticMembers.port;
     const clientConfig = opts?.clientConfig ?? {};
     const fallback =
@@ -280,6 +285,9 @@ export class VersionsClient {
     // of calling the API is handled in `google-gax`, with this code
     // merely providing the destination and request information.
     this.innerApiCalls = {};
+
+    // Add a warn function to the client constructor so it can be easily tested.
+    this.warn = gax.warn;
   }
 
   /**
@@ -308,7 +316,8 @@ export class VersionsClient {
           )
         : // eslint-disable-next-line @typescript-eslint/no-explicit-any
           (this._protos as any).google.cloud.dialogflow.cx.v3.Versions,
-      this._opts
+      this._opts,
+      this._providedCustomServicePath
     ) as Promise<{[method: string]: Function}>;
 
     // Iterate over each of the methods that the service provides
diff --git a/src/v3/webhooks_client.ts b/src/v3/webhooks_client.ts
index caa9d1b1..602044c6 100644
--- a/src/v3/webhooks_client.ts
+++ b/src/v3/webhooks_client.ts
@@ -48,6 +48,7 @@ const version = require('../../../package.json').version;
 export class WebhooksClient {
   private _terminated = false;
   private _opts: ClientOptions;
+  private _providedCustomServicePath: boolean;
   private _gaxModule: typeof gax | typeof gax.fallback;
   private _gaxGrpc: gax.GrpcClient | gax.fallback.GrpcClient;
   private _protos: {};
@@ -59,6 +60,7 @@ export class WebhooksClient {
     longrunning: {},
     batching: {},
   };
+  warn: (code: string, message: string, warnType?: string) => void;
   innerApiCalls: {[name: string]: Function};
   pathTemplates: {[name: string]: gax.PathTemplate};
   webhooksStub?: Promise<{[name: string]: Function}>;
@@ -102,6 +104,9 @@ export class WebhooksClient {
     const staticMembers = this.constructor as typeof WebhooksClient;
     const servicePath =
       opts?.servicePath || opts?.apiEndpoint || staticMembers.servicePath;
+    this._providedCustomServicePath = !!(
+      opts?.servicePath || opts?.apiEndpoint
+    );
     const port = opts?.port || staticMembers.port;
     const clientConfig = opts?.clientConfig ?? {};
     const fallback =
@@ -247,6 +252,9 @@ export class WebhooksClient {
     // of calling the API is handled in `google-gax`, with this code
     // merely providing the destination and request information.
     this.innerApiCalls = {};
+
+    // Add a warn function to the client constructor so it can be easily tested.
+    this.warn = gax.warn;
   }
 
   /**
@@ -275,7 +283,8 @@ export class WebhooksClient {
           )
         : // eslint-disable-next-line @typescript-eslint/no-explicit-any
           (this._protos as any).google.cloud.dialogflow.cx.v3.Webhooks,
-      this._opts
+      this._opts,
+      this._providedCustomServicePath
     ) as Promise<{[method: string]: Function}>;
 
     // Iterate over each of the methods that the service provides
diff --git a/src/v3beta1/agents_client.ts b/src/v3beta1/agents_client.ts
index a5feff20..7016d36e 100644
--- a/src/v3beta1/agents_client.ts
+++ b/src/v3beta1/agents_client.ts
@@ -49,6 +49,7 @@ const version = require('../../../package.json').version;
 export class AgentsClient {
   private _terminated = false;
   private _opts: ClientOptions;
+  private _providedCustomServicePath: boolean;
   private _gaxModule: typeof gax | typeof gax.fallback;
   private _gaxGrpc: gax.GrpcClient | gax.fallback.GrpcClient;
   private _protos: {};
@@ -60,6 +61,7 @@ export class AgentsClient {
     longrunning: {},
     batching: {},
   };
+  warn: (code: string, message: string, warnType?: string) => void;
   innerApiCalls: {[name: string]: Function};
   pathTemplates: {[name: string]: gax.PathTemplate};
   operationsClient: gax.OperationsClient;
@@ -104,6 +106,9 @@ export class AgentsClient {
     const staticMembers = this.constructor as typeof AgentsClient;
     const servicePath =
       opts?.servicePath || opts?.apiEndpoint || staticMembers.servicePath;
+    this._providedCustomServicePath = !!(
+      opts?.servicePath || opts?.apiEndpoint
+    );
     const port = opts?.port || staticMembers.port;
     const clientConfig = opts?.clientConfig ?? {};
     const fallback =
@@ -280,6 +285,9 @@ export class AgentsClient {
     // of calling the API is handled in `google-gax`, with this code
     // merely providing the destination and request information.
     this.innerApiCalls = {};
+
+    // Add a warn function to the client constructor so it can be easily tested.
+    this.warn = gax.warn;
   }
 
   /**
@@ -308,7 +316,8 @@ export class AgentsClient {
           )
         : // eslint-disable-next-line @typescript-eslint/no-explicit-any
           (this._protos as any).google.cloud.dialogflow.cx.v3beta1.Agents,
-      this._opts
+      this._opts,
+      this._providedCustomServicePath
     ) as Promise<{[method: string]: Function}>;
 
     // Iterate over each of the methods that the service provides
diff --git a/src/v3beta1/entity_types_client.ts b/src/v3beta1/entity_types_client.ts
index 22606e80..61159239 100644
--- a/src/v3beta1/entity_types_client.ts
+++ b/src/v3beta1/entity_types_client.ts
@@ -48,6 +48,7 @@ const version = require('../../../package.json').version;
 export class EntityTypesClient {
   private _terminated = false;
   private _opts: ClientOptions;
+  private _providedCustomServicePath: boolean;
   private _gaxModule: typeof gax | typeof gax.fallback;
   private _gaxGrpc: gax.GrpcClient | gax.fallback.GrpcClient;
   private _protos: {};
@@ -59,6 +60,7 @@ export class EntityTypesClient {
     longrunning: {},
     batching: {},
   };
+  warn: (code: string, message: string, warnType?: string) => void;
   innerApiCalls: {[name: string]: Function};
   pathTemplates: {[name: string]: gax.PathTemplate};
   entityTypesStub?: Promise<{[name: string]: Function}>;
@@ -102,6 +104,9 @@ export class EntityTypesClient {
     const staticMembers = this.constructor as typeof EntityTypesClient;
     const servicePath =
       opts?.servicePath || opts?.apiEndpoint || staticMembers.servicePath;
+    this._providedCustomServicePath = !!(
+      opts?.servicePath || opts?.apiEndpoint
+    );
     const port = opts?.port || staticMembers.port;
     const clientConfig = opts?.clientConfig ?? {};
     const fallback =
@@ -240,6 +245,9 @@ export class EntityTypesClient {
     // of calling the API is handled in `google-gax`, with this code
     // merely providing the destination and request information.
     this.innerApiCalls = {};
+
+    // Add a warn function to the client constructor so it can be easily tested.
+    this.warn = gax.warn;
   }
 
   /**
@@ -268,7 +276,8 @@ export class EntityTypesClient {
           )
         : // eslint-disable-next-line @typescript-eslint/no-explicit-any
           (this._protos as any).google.cloud.dialogflow.cx.v3beta1.EntityTypes,
-      this._opts
+      this._opts,
+      this._providedCustomServicePath
     ) as Promise<{[method: string]: Function}>;
 
     // Iterate over each of the methods that the service provides
diff --git a/src/v3beta1/environments_client.ts b/src/v3beta1/environments_client.ts
index 31b58013..433f86d1 100644
--- a/src/v3beta1/environments_client.ts
+++ b/src/v3beta1/environments_client.ts
@@ -49,6 +49,7 @@ const version = require('../../../package.json').version;
 export class EnvironmentsClient {
   private _terminated = false;
   private _opts: ClientOptions;
+  private _providedCustomServicePath: boolean;
   private _gaxModule: typeof gax | typeof gax.fallback;
   private _gaxGrpc: gax.GrpcClient | gax.fallback.GrpcClient;
   private _protos: {};
@@ -60,6 +61,7 @@ export class EnvironmentsClient {
     longrunning: {},
     batching: {},
   };
+  warn: (code: string, message: string, warnType?: string) => void;
   innerApiCalls: {[name: string]: Function};
   pathTemplates: {[name: string]: gax.PathTemplate};
   operationsClient: gax.OperationsClient;
@@ -104,6 +106,9 @@ export class EnvironmentsClient {
     const staticMembers = this.constructor as typeof EnvironmentsClient;
     const servicePath =
       opts?.servicePath || opts?.apiEndpoint || staticMembers.servicePath;
+    this._providedCustomServicePath = !!(
+      opts?.servicePath || opts?.apiEndpoint
+    );
     const port = opts?.port || staticMembers.port;
     const clientConfig = opts?.clientConfig ?? {};
     const fallback =
@@ -301,6 +306,9 @@ export class EnvironmentsClient {
     // of calling the API is handled in `google-gax`, with this code
     // merely providing the destination and request information.
     this.innerApiCalls = {};
+
+    // Add a warn function to the client constructor so it can be easily tested.
+    this.warn = gax.warn;
   }
 
   /**
@@ -329,7 +337,8 @@ export class EnvironmentsClient {
           )
         : // eslint-disable-next-line @typescript-eslint/no-explicit-any
           (this._protos as any).google.cloud.dialogflow.cx.v3beta1.Environments,
-      this._opts
+      this._opts,
+      this._providedCustomServicePath
     ) as Promise<{[method: string]: Function}>;
 
     // Iterate over each of the methods that the service provides
diff --git a/src/v3beta1/experiments_client.ts b/src/v3beta1/experiments_client.ts
index 56cc23bc..528c8cf1 100644
--- a/src/v3beta1/experiments_client.ts
+++ b/src/v3beta1/experiments_client.ts
@@ -48,6 +48,7 @@ const version = require('../../../package.json').version;
 export class ExperimentsClient {
   private _terminated = false;
   private _opts: ClientOptions;
+  private _providedCustomServicePath: boolean;
   private _gaxModule: typeof gax | typeof gax.fallback;
   private _gaxGrpc: gax.GrpcClient | gax.fallback.GrpcClient;
   private _protos: {};
@@ -59,6 +60,7 @@ export class ExperimentsClient {
     longrunning: {},
     batching: {},
   };
+  warn: (code: string, message: string, warnType?: string) => void;
   innerApiCalls: {[name: string]: Function};
   pathTemplates: {[name: string]: gax.PathTemplate};
   experimentsStub?: Promise<{[name: string]: Function}>;
@@ -102,6 +104,9 @@ export class ExperimentsClient {
     const staticMembers = this.constructor as typeof ExperimentsClient;
     const servicePath =
       opts?.servicePath || opts?.apiEndpoint || staticMembers.servicePath;
+    this._providedCustomServicePath = !!(
+      opts?.servicePath || opts?.apiEndpoint
+    );
     const port = opts?.port || staticMembers.port;
     const clientConfig = opts?.clientConfig ?? {};
     const fallback =
@@ -240,6 +245,9 @@ export class ExperimentsClient {
     // of calling the API is handled in `google-gax`, with this code
     // merely providing the destination and request information.
     this.innerApiCalls = {};
+
+    // Add a warn function to the client constructor so it can be easily tested.
+    this.warn = gax.warn;
   }
 
   /**
@@ -268,7 +276,8 @@ export class ExperimentsClient {
           )
         : // eslint-disable-next-line @typescript-eslint/no-explicit-any
           (this._protos as any).google.cloud.dialogflow.cx.v3beta1.Experiments,
-      this._opts
+      this._opts,
+      this._providedCustomServicePath
     ) as Promise<{[method: string]: Function}>;
 
     // Iterate over each of the methods that the service provides
diff --git a/src/v3beta1/flows_client.ts b/src/v3beta1/flows_client.ts
index 1459c562..16679938 100644
--- a/src/v3beta1/flows_client.ts
+++ b/src/v3beta1/flows_client.ts
@@ -49,6 +49,7 @@ const version = require('../../../package.json').version;
 export class FlowsClient {
   private _terminated = false;
   private _opts: ClientOptions;
+  private _providedCustomServicePath: boolean;
   private _gaxModule: typeof gax | typeof gax.fallback;
   private _gaxGrpc: gax.GrpcClient | gax.fallback.GrpcClient;
   private _protos: {};
@@ -60,6 +61,7 @@ export class FlowsClient {
     longrunning: {},
     batching: {},
   };
+  warn: (code: string, message: string, warnType?: string) => void;
   innerApiCalls: {[name: string]: Function};
   pathTemplates: {[name: string]: gax.PathTemplate};
   operationsClient: gax.OperationsClient;
@@ -104,6 +106,9 @@ export class FlowsClient {
     const staticMembers = this.constructor as typeof FlowsClient;
     const servicePath =
       opts?.servicePath || opts?.apiEndpoint || staticMembers.servicePath;
+    this._providedCustomServicePath = !!(
+      opts?.servicePath || opts?.apiEndpoint
+    );
     const port = opts?.port || staticMembers.port;
     const clientConfig = opts?.clientConfig ?? {};
     const fallback =
@@ -291,6 +296,9 @@ export class FlowsClient {
     // of calling the API is handled in `google-gax`, with this code
     // merely providing the destination and request information.
     this.innerApiCalls = {};
+
+    // Add a warn function to the client constructor so it can be easily tested.
+    this.warn = gax.warn;
   }
 
   /**
@@ -319,7 +327,8 @@ export class FlowsClient {
           )
         : // eslint-disable-next-line @typescript-eslint/no-explicit-any
           (this._protos as any).google.cloud.dialogflow.cx.v3beta1.Flows,
-      this._opts
+      this._opts,
+      this._providedCustomServicePath
     ) as Promise<{[method: string]: Function}>;
 
     // Iterate over each of the methods that the service provides
diff --git a/src/v3beta1/intents_client.ts b/src/v3beta1/intents_client.ts
index 344e3638..6a0629ff 100644
--- a/src/v3beta1/intents_client.ts
+++ b/src/v3beta1/intents_client.ts
@@ -48,6 +48,7 @@ const version = require('../../../package.json').version;
 export class IntentsClient {
   private _terminated = false;
   private _opts: ClientOptions;
+  private _providedCustomServicePath: boolean;
   private _gaxModule: typeof gax | typeof gax.fallback;
   private _gaxGrpc: gax.GrpcClient | gax.fallback.GrpcClient;
   private _protos: {};
@@ -59,6 +60,7 @@ export class IntentsClient {
     longrunning: {},
     batching: {},
   };
+  warn: (code: string, message: string, warnType?: string) => void;
   innerApiCalls: {[name: string]: Function};
   pathTemplates: {[name: string]: gax.PathTemplate};
   intentsStub?: Promise<{[name: string]: Function}>;
@@ -102,6 +104,9 @@ export class IntentsClient {
     const staticMembers = this.constructor as typeof IntentsClient;
     const servicePath =
       opts?.servicePath || opts?.apiEndpoint || staticMembers.servicePath;
+    this._providedCustomServicePath = !!(
+      opts?.servicePath || opts?.apiEndpoint
+    );
     const port = opts?.port || staticMembers.port;
     const clientConfig = opts?.clientConfig ?? {};
     const fallback =
@@ -240,6 +245,9 @@ export class IntentsClient {
     // of calling the API is handled in `google-gax`, with this code
     // merely providing the destination and request information.
     this.innerApiCalls = {};
+
+    // Add a warn function to the client constructor so it can be easily tested.
+    this.warn = gax.warn;
   }
 
   /**
@@ -268,7 +276,8 @@ export class IntentsClient {
           )
         : // eslint-disable-next-line @typescript-eslint/no-explicit-any
           (this._protos as any).google.cloud.dialogflow.cx.v3beta1.Intents,
-      this._opts
+      this._opts,
+      this._providedCustomServicePath
     ) as Promise<{[method: string]: Function}>;
 
     // Iterate over each of the methods that the service provides
diff --git a/src/v3beta1/pages_client.ts b/src/v3beta1/pages_client.ts
index ea12e666..dfc3fe8b 100644
--- a/src/v3beta1/pages_client.ts
+++ b/src/v3beta1/pages_client.ts
@@ -48,6 +48,7 @@ const version = require('../../../package.json').version;
 export class PagesClient {
   private _terminated = false;
   private _opts: ClientOptions;
+  private _providedCustomServicePath: boolean;
   private _gaxModule: typeof gax | typeof gax.fallback;
   private _gaxGrpc: gax.GrpcClient | gax.fallback.GrpcClient;
   private _protos: {};
@@ -59,6 +60,7 @@ export class PagesClient {
     longrunning: {},
     batching: {},
   };
+  warn: (code: string, message: string, warnType?: string) => void;
   innerApiCalls: {[name: string]: Function};
   pathTemplates: {[name: string]: gax.PathTemplate};
   pagesStub?: Promise<{[name: string]: Function}>;
@@ -102,6 +104,9 @@ export class PagesClient {
     const staticMembers = this.constructor as typeof PagesClient;
     const servicePath =
       opts?.servicePath || opts?.apiEndpoint || staticMembers.servicePath;
+    this._providedCustomServicePath = !!(
+      opts?.servicePath || opts?.apiEndpoint
+    );
     const port = opts?.port || staticMembers.port;
     const clientConfig = opts?.clientConfig ?? {};
     const fallback =
@@ -240,6 +245,9 @@ export class PagesClient {
     // of calling the API is handled in `google-gax`, with this code
     // merely providing the destination and request information.
     this.innerApiCalls = {};
+
+    // Add a warn function to the client constructor so it can be easily tested.
+    this.warn = gax.warn;
   }
 
   /**
@@ -268,7 +276,8 @@ export class PagesClient {
           )
         : // eslint-disable-next-line @typescript-eslint/no-explicit-any
           (this._protos as any).google.cloud.dialogflow.cx.v3beta1.Pages,
-      this._opts
+      this._opts,
+      this._providedCustomServicePath
     ) as Promise<{[method: string]: Function}>;
 
     // Iterate over each of the methods that the service provides
diff --git a/src/v3beta1/security_settings_service_client.ts b/src/v3beta1/security_settings_service_client.ts
index b5676fac..525cf120 100644
--- a/src/v3beta1/security_settings_service_client.ts
+++ b/src/v3beta1/security_settings_service_client.ts
@@ -48,6 +48,7 @@ const version = require('../../../package.json').version;
 export class SecuritySettingsServiceClient {
   private _terminated = false;
   private _opts: ClientOptions;
+  private _providedCustomServicePath: boolean;
   private _gaxModule: typeof gax | typeof gax.fallback;
   private _gaxGrpc: gax.GrpcClient | gax.fallback.GrpcClient;
   private _protos: {};
@@ -59,6 +60,7 @@ export class SecuritySettingsServiceClient {
     longrunning: {},
     batching: {},
   };
+  warn: (code: string, message: string, warnType?: string) => void;
   innerApiCalls: {[name: string]: Function};
   pathTemplates: {[name: string]: gax.PathTemplate};
   securitySettingsServiceStub?: Promise<{[name: string]: Function}>;
@@ -103,6 +105,9 @@ export class SecuritySettingsServiceClient {
       .constructor as typeof SecuritySettingsServiceClient;
     const servicePath =
       opts?.servicePath || opts?.apiEndpoint || staticMembers.servicePath;
+    this._providedCustomServicePath = !!(
+      opts?.servicePath || opts?.apiEndpoint
+    );
     const port = opts?.port || staticMembers.port;
     const clientConfig = opts?.clientConfig ?? {};
     const fallback =
@@ -241,6 +246,9 @@ export class SecuritySettingsServiceClient {
     // of calling the API is handled in `google-gax`, with this code
     // merely providing the destination and request information.
     this.innerApiCalls = {};
+
+    // Add a warn function to the client constructor so it can be easily tested.
+    this.warn = gax.warn;
   }
 
   /**
@@ -270,7 +278,8 @@ export class SecuritySettingsServiceClient {
         : // eslint-disable-next-line @typescript-eslint/no-explicit-any
           (this._protos as any).google.cloud.dialogflow.cx.v3beta1
             .SecuritySettingsService,
-      this._opts
+      this._opts,
+      this._providedCustomServicePath
     ) as Promise<{[method: string]: Function}>;
 
     // Iterate over each of the methods that the service provides
diff --git a/src/v3beta1/session_entity_types_client.ts b/src/v3beta1/session_entity_types_client.ts
index 95d3339a..a38bd597 100644
--- a/src/v3beta1/session_entity_types_client.ts
+++ b/src/v3beta1/session_entity_types_client.ts
@@ -48,6 +48,7 @@ const version = require('../../../package.json').version;
 export class SessionEntityTypesClient {
   private _terminated = false;
   private _opts: ClientOptions;
+  private _providedCustomServicePath: boolean;
   private _gaxModule: typeof gax | typeof gax.fallback;
   private _gaxGrpc: gax.GrpcClient | gax.fallback.GrpcClient;
   private _protos: {};
@@ -59,6 +60,7 @@ export class SessionEntityTypesClient {
     longrunning: {},
     batching: {},
   };
+  warn: (code: string, message: string, warnType?: string) => void;
   innerApiCalls: {[name: string]: Function};
   pathTemplates: {[name: string]: gax.PathTemplate};
   sessionEntityTypesStub?: Promise<{[name: string]: Function}>;
@@ -102,6 +104,9 @@ export class SessionEntityTypesClient {
     const staticMembers = this.constructor as typeof SessionEntityTypesClient;
     const servicePath =
       opts?.servicePath || opts?.apiEndpoint || staticMembers.servicePath;
+    this._providedCustomServicePath = !!(
+      opts?.servicePath || opts?.apiEndpoint
+    );
     const port = opts?.port || staticMembers.port;
     const clientConfig = opts?.clientConfig ?? {};
     const fallback =
@@ -243,6 +248,9 @@ export class SessionEntityTypesClient {
     // of calling the API is handled in `google-gax`, with this code
     // merely providing the destination and request information.
     this.innerApiCalls = {};
+
+    // Add a warn function to the client constructor so it can be easily tested.
+    this.warn = gax.warn;
   }
 
   /**
@@ -272,7 +280,8 @@ export class SessionEntityTypesClient {
         : // eslint-disable-next-line @typescript-eslint/no-explicit-any
           (this._protos as any).google.cloud.dialogflow.cx.v3beta1
             .SessionEntityTypes,
-      this._opts
+      this._opts,
+      this._providedCustomServicePath
     ) as Promise<{[method: string]: Function}>;
 
     // Iterate over each of the methods that the service provides
diff --git a/src/v3beta1/sessions_client.ts b/src/v3beta1/sessions_client.ts
index 2ab360be..2206c80e 100644
--- a/src/v3beta1/sessions_client.ts
+++ b/src/v3beta1/sessions_client.ts
@@ -41,6 +41,7 @@ const version = require('../../../package.json').version;
 export class SessionsClient {
   private _terminated = false;
   private _opts: ClientOptions;
+  private _providedCustomServicePath: boolean;
   private _gaxModule: typeof gax | typeof gax.fallback;
   private _gaxGrpc: gax.GrpcClient | gax.fallback.GrpcClient;
   private _protos: {};
@@ -52,6 +53,7 @@ export class SessionsClient {
     longrunning: {},
     batching: {},
   };
+  warn: (code: string, message: string, warnType?: string) => void;
   innerApiCalls: {[name: string]: Function};
   pathTemplates: {[name: string]: gax.PathTemplate};
   sessionsStub?: Promise<{[name: string]: Function}>;
@@ -95,6 +97,9 @@ export class SessionsClient {
     const staticMembers = this.constructor as typeof SessionsClient;
     const servicePath =
       opts?.servicePath || opts?.apiEndpoint || staticMembers.servicePath;
+    this._providedCustomServicePath = !!(
+      opts?.servicePath || opts?.apiEndpoint
+    );
     const port = opts?.port || staticMembers.port;
     const clientConfig = opts?.clientConfig ?? {};
     const fallback =
@@ -231,6 +236,9 @@ export class SessionsClient {
     // of calling the API is handled in `google-gax`, with this code
     // merely providing the destination and request information.
     this.innerApiCalls = {};
+
+    // Add a warn function to the client constructor so it can be easily tested.
+    this.warn = gax.warn;
   }
 
   /**
@@ -259,7 +267,8 @@ export class SessionsClient {
           )
         : // eslint-disable-next-line @typescript-eslint/no-explicit-any
           (this._protos as any).google.cloud.dialogflow.cx.v3beta1.Sessions,
-      this._opts
+      this._opts,
+      this._providedCustomServicePath
     ) as Promise<{[method: string]: Function}>;
 
     // Iterate over each of the methods that the service provides
diff --git a/src/v3beta1/test_cases_client.ts b/src/v3beta1/test_cases_client.ts
index fdd729fd..9b467f88 100644
--- a/src/v3beta1/test_cases_client.ts
+++ b/src/v3beta1/test_cases_client.ts
@@ -50,6 +50,7 @@ const version = require('../../../package.json').version;
 export class TestCasesClient {
   private _terminated = false;
   private _opts: ClientOptions;
+  private _providedCustomServicePath: boolean;
   private _gaxModule: typeof gax | typeof gax.fallback;
   private _gaxGrpc: gax.GrpcClient | gax.fallback.GrpcClient;
   private _protos: {};
@@ -61,6 +62,7 @@ export class TestCasesClient {
     longrunning: {},
     batching: {},
   };
+  warn: (code: string, message: string, warnType?: string) => void;
   innerApiCalls: {[name: string]: Function};
   pathTemplates: {[name: string]: gax.PathTemplate};
   operationsClient: gax.OperationsClient;
@@ -105,6 +107,9 @@ export class TestCasesClient {
     const staticMembers = this.constructor as typeof TestCasesClient;
     const servicePath =
       opts?.servicePath || opts?.apiEndpoint || staticMembers.servicePath;
+    this._providedCustomServicePath = !!(
+      opts?.servicePath || opts?.apiEndpoint
+    );
     const port = opts?.port || staticMembers.port;
     const clientConfig = opts?.clientConfig ?? {};
     const fallback =
@@ -308,6 +313,9 @@ export class TestCasesClient {
     // of calling the API is handled in `google-gax`, with this code
     // merely providing the destination and request information.
     this.innerApiCalls = {};
+
+    // Add a warn function to the client constructor so it can be easily tested.
+    this.warn = gax.warn;
   }
 
   /**
@@ -336,7 +344,8 @@ export class TestCasesClient {
           )
         : // eslint-disable-next-line @typescript-eslint/no-explicit-any
           (this._protos as any).google.cloud.dialogflow.cx.v3beta1.TestCases,
-      this._opts
+      this._opts,
+      this._providedCustomServicePath
     ) as Promise<{[method: string]: Function}>;
 
     // Iterate over each of the methods that the service provides
diff --git a/src/v3beta1/transition_route_groups_client.ts b/src/v3beta1/transition_route_groups_client.ts
index 54022214..ba3edbf5 100644
--- a/src/v3beta1/transition_route_groups_client.ts
+++ b/src/v3beta1/transition_route_groups_client.ts
@@ -48,6 +48,7 @@ const version = require('../../../package.json').version;
 export class TransitionRouteGroupsClient {
   private _terminated = false;
   private _opts: ClientOptions;
+  private _providedCustomServicePath: boolean;
   private _gaxModule: typeof gax | typeof gax.fallback;
   private _gaxGrpc: gax.GrpcClient | gax.fallback.GrpcClient;
   private _protos: {};
@@ -59,6 +60,7 @@ export class TransitionRouteGroupsClient {
     longrunning: {},
     batching: {},
   };
+  warn: (code: string, message: string, warnType?: string) => void;
   innerApiCalls: {[name: string]: Function};
   pathTemplates: {[name: string]: gax.PathTemplate};
   transitionRouteGroupsStub?: Promise<{[name: string]: Function}>;
@@ -103,6 +105,9 @@ export class TransitionRouteGroupsClient {
       .constructor as typeof TransitionRouteGroupsClient;
     const servicePath =
       opts?.servicePath || opts?.apiEndpoint || staticMembers.servicePath;
+    this._providedCustomServicePath = !!(
+      opts?.servicePath || opts?.apiEndpoint
+    );
     const port = opts?.port || staticMembers.port;
     const clientConfig = opts?.clientConfig ?? {};
     const fallback =
@@ -241,6 +246,9 @@ export class TransitionRouteGroupsClient {
     // of calling the API is handled in `google-gax`, with this code
     // merely providing the destination and request information.
     this.innerApiCalls = {};
+
+    // Add a warn function to the client constructor so it can be easily tested.
+    this.warn = gax.warn;
   }
 
   /**
@@ -270,7 +278,8 @@ export class TransitionRouteGroupsClient {
         : // eslint-disable-next-line @typescript-eslint/no-explicit-any
           (this._protos as any).google.cloud.dialogflow.cx.v3beta1
             .TransitionRouteGroups,
-      this._opts
+      this._opts,
+      this._providedCustomServicePath
     ) as Promise<{[method: string]: Function}>;
 
     // Iterate over each of the methods that the service provides
diff --git a/src/v3beta1/versions_client.ts b/src/v3beta1/versions_client.ts
index a1592196..05002f5c 100644
--- a/src/v3beta1/versions_client.ts
+++ b/src/v3beta1/versions_client.ts
@@ -49,6 +49,7 @@ const version = require('../../../package.json').version;
 export class VersionsClient {
   private _terminated = false;
   private _opts: ClientOptions;
+  private _providedCustomServicePath: boolean;
   private _gaxModule: typeof gax | typeof gax.fallback;
   private _gaxGrpc: gax.GrpcClient | gax.fallback.GrpcClient;
   private _protos: {};
@@ -60,6 +61,7 @@ export class VersionsClient {
     longrunning: {},
     batching: {},
   };
+  warn: (code: string, message: string, warnType?: string) => void;
   innerApiCalls: {[name: string]: Function};
   pathTemplates: {[name: string]: gax.PathTemplate};
   operationsClient: gax.OperationsClient;
@@ -104,6 +106,9 @@ export class VersionsClient {
     const staticMembers = this.constructor as typeof VersionsClient;
     const servicePath =
       opts?.servicePath || opts?.apiEndpoint || staticMembers.servicePath;
+    this._providedCustomServicePath = !!(
+      opts?.servicePath || opts?.apiEndpoint
+    );
     const port = opts?.port || staticMembers.port;
     const clientConfig = opts?.clientConfig ?? {};
     const fallback =
@@ -280,6 +285,9 @@ export class VersionsClient {
     // of calling the API is handled in `google-gax`, with this code
     // merely providing the destination and request information.
     this.innerApiCalls = {};
+
+    // Add a warn function to the client constructor so it can be easily tested.
+    this.warn = gax.warn;
   }
 
   /**
@@ -308,7 +316,8 @@ export class VersionsClient {
           )
         : // eslint-disable-next-line @typescript-eslint/no-explicit-any
           (this._protos as any).google.cloud.dialogflow.cx.v3beta1.Versions,
-      this._opts
+      this._opts,
+      this._providedCustomServicePath
     ) as Promise<{[method: string]: Function}>;
 
     // Iterate over each of the methods that the service provides
diff --git a/src/v3beta1/webhooks_client.ts b/src/v3beta1/webhooks_client.ts
index e9840e00..d363f188 100644
--- a/src/v3beta1/webhooks_client.ts
+++ b/src/v3beta1/webhooks_client.ts
@@ -48,6 +48,7 @@ const version = require('../../../package.json').version;
 export class WebhooksClient {
   private _terminated = false;
   private _opts: ClientOptions;
+  private _providedCustomServicePath: boolean;
   private _gaxModule: typeof gax | typeof gax.fallback;
   private _gaxGrpc: gax.GrpcClient | gax.fallback.GrpcClient;
   private _protos: {};
@@ -59,6 +60,7 @@ export class WebhooksClient {
     longrunning: {},
     batching: {},
   };
+  warn: (code: string, message: string, warnType?: string) => void;
   innerApiCalls: {[name: string]: Function};
   pathTemplates: {[name: string]: gax.PathTemplate};
   webhooksStub?: Promise<{[name: string]: Function}>;
@@ -102,6 +104,9 @@ export class WebhooksClient {
     const staticMembers = this.constructor as typeof WebhooksClient;
     const servicePath =
       opts?.servicePath || opts?.apiEndpoint || staticMembers.servicePath;
+    this._providedCustomServicePath = !!(
+      opts?.servicePath || opts?.apiEndpoint
+    );
     const port = opts?.port || staticMembers.port;
     const clientConfig = opts?.clientConfig ?? {};
     const fallback =
@@ -247,6 +252,9 @@ export class WebhooksClient {
     // of calling the API is handled in `google-gax`, with this code
     // merely providing the destination and request information.
     this.innerApiCalls = {};
+
+    // Add a warn function to the client constructor so it can be easily tested.
+    this.warn = gax.warn;
   }
 
   /**
@@ -275,7 +283,8 @@ export class WebhooksClient {
           )
         : // eslint-disable-next-line @typescript-eslint/no-explicit-any
           (this._protos as any).google.cloud.dialogflow.cx.v3beta1.Webhooks,
-      this._opts
+      this._opts,
+      this._providedCustomServicePath
     ) as Promise<{[method: string]: Function}>;
 
     // Iterate over each of the methods that the service provides