fix(lambda): use enum values for applicationLogLevel and systemLogLev…

…el (#29904)

### Issue # (if applicable)

### Reason for this change

Enumerate `ApplicationLogLevel` and `SystemLogLevel` to help with typing

### Description of changes

Both fields should use the enum type for available options

### Description of how you validated changes



### Checklist
- [x] My code adheres to the [CONTRIBUTING GUIDE](https://github.com/aws/aws-cdk/blob/main/CONTRIBUTING.md) and [DESIGN GUIDELINES](https://github.com/aws/aws-cdk/blob/main/docs/DESIGN_GUIDELINES.md)

----

*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

packages/@aws-cdk-testing/framework-integ/test/aws-lambda/test/integ.logging-config.js.snapshot/aws-cdk-lambda-logging-config.template.json

@@ -393,6 +393,61 @@
    "DependsOn": [
     "LambdaWithLogLevelServiceRole90A45743"
    ]
+  },
+  "LambdaWithLogLevelV2ServiceRoleD184382A": {
+   "Type": "AWS::IAM::Role",
+   "Properties": {
+    "AssumeRolePolicyDocument": {
+     "Statement": [
+      {
+       "Action": "sts:AssumeRole",
+       "Effect": "Allow",
+       "Principal": {
+        "Service": "lambda.amazonaws.com"
+       }
+      }
+     ],
+     "Version": "2012-10-17"
+    },
+    "ManagedPolicyArns": [
+     {
+      "Fn::Join": [
+       "",
+       [
+        "arn:",
+        {
+         "Ref": "AWS::Partition"
+        },
+        ":iam::aws:policy/service-role/AWSLambdaBasicExecutionRole"
+       ]
+      ]
+     }
+    ]
+   }
+  },
+  "LambdaWithLogLevelV2D4FB10AC": {
+   "Type": "AWS::Lambda::Function",
+   "Properties": {
+    "Code": {
+     "ZipFile": "foo"
+    },
+    "Handler": "index.handler",
+    "LoggingConfig": {
+     "ApplicationLogLevel": "INFO",
+     "LogFormat": "JSON",
+     "SystemLogLevel": "INFO"
+    },
+    "Role": {
+     "Fn::GetAtt": [
+      "LambdaWithLogLevelV2ServiceRoleD184382A",
+      "Arn"
+     ]
+    },
+    "Runtime": "nodejs18.x"
+   },
+   "DependsOn": [
+    "LambdaWithLogLevelV2ServiceRoleD184382A"
+   ]
   }
  },
  "Parameters": {

packages/@aws-cdk-testing/framework-integ/test/aws-lambda/test/integ.logging-config.ts

@@ -62,6 +62,15 @@ new Function(stack, 'LambdaWithLogLevel', {
   applicationLogLevel: ApplicationLogLevel.INFO,
 });
 
+new Function(stack, 'LambdaWithLogLevelV2', {
+  code: new InlineCode('foo'),
+  handler: 'index.handler',
+  runtime: Runtime.NODEJS_18_X,
+  loggingFormat: LoggingFormat.JSON,
+  systemLogLevelV2: SystemLogLevel.INFO,
+  applicationLogLevelV2: ApplicationLogLevel.INFO,
+});
+
 new integ.IntegTest(app, 'lambda-logging-config', {
   testCases: [stack],
 });

packages/aws-cdk-lib/aws-lambda/README.md

@@ -160,20 +160,20 @@ as choosing the log group:
 ```ts
 import { ILogGroup } from 'aws-cdk-lib/aws-logs';
 
-declare const logGroup: ILogGroup;  
+declare const logGroup: ILogGroup;
 
 new lambda.Function(this, 'Lambda', {
   code: new lambda.InlineCode('foo'),
   handler: 'index.handler',
   runtime: lambda.Runtime.NODEJS_18_X,
   loggingFormat: lambda.LoggingFormat.JSON,
-  systemLogLevel: lambda.SystemLogLevel.INFO,
-  applicationLogLevel: lambda.ApplicationLogLevel.INFO,
+  systemLogLevelV2: lambda.SystemLogLevel.INFO,
+  applicationLogLevelV2: lambda.ApplicationLogLevel.INFO,
   logGroup: logGroup,
 });
 ```
 
-To use `applicationLogLevel` and/or `systemLogLevel` you must set `loggingFormat` to `LoggingFormat.JSON`.
+To use `applicationLogLevelV2` and/or `systemLogLevelV2` you must set `loggingFormat` to `LoggingFormat.JSON`.
 
 ## Resource-based Policies
 
@@ -1077,8 +1077,8 @@ const fn = new lambda.Function(this, 'MyLambda', {
 
 ## IPv6 support
 
-You can configure IPv6 connectivity for lambda function by setting `Ipv6AllowedForDualStack` to true. 
-It allows Lambda functions to specify whether the IPv6 traffic should be allowed when using dual-stack VPCs. 
+You can configure IPv6 connectivity for lambda function by setting `Ipv6AllowedForDualStack` to true.
+It allows Lambda functions to specify whether the IPv6 traffic should be allowed when using dual-stack VPCs.
 To access IPv6 network using Lambda, Dual-stack VPC is required. Using dual-stack VPC a function communicates with subnet over either of IPv4 or IPv6.
 
 ```ts

packages/aws-cdk-lib/aws-lambda/lib/function.ts

@@ -524,6 +524,7 @@ export interface FunctionOptions extends EventInvokeConfigOptions {
 
   /**
    * Sets the logFormat for the function.
+   * @deprecated Use `loggingFormat` as a property instead.
    * @default "Text"
    */
   readonly logFormat?: string;
@@ -536,15 +537,29 @@ export interface FunctionOptions extends EventInvokeConfigOptions {
 
   /**
    * Sets the application log level for the function.
+   * @deprecated Use `applicationLogLevelV2` as a property instead.
    * @default "INFO"
    */
   readonly applicationLogLevel?: string;
 
+  /**
+   * Sets the application log level for the function.
+   * @default ApplicationLogLevel.INFO
+   */
+  readonly applicationLogLevelV2?: ApplicationLogLevel;
+
   /**
    * Sets the system log level for the function.
+   * @deprecated Use `systemLogLevelV2` as a property instead.
    * @default "INFO"
    */
   readonly systemLogLevel?: string;
+
+  /**
+   * Sets the system log level for the function.
+   * @default SystemLogLevel.INFO
+   */
+  readonly systemLogLevelV2?: SystemLogLevel;
 }
 
 export interface FunctionProps extends FunctionOptions {
@@ -1151,25 +1166,34 @@ export class Function extends FunctionBase {
    * function and undefined if not.
    */
   private getLoggingConfig(props: FunctionProps): CfnFunction.LoggingConfigProperty | undefined {
-    if ((props.applicationLogLevel || props.systemLogLevel) && props.logFormat !== LogFormat.JSON
-    && props.loggingFormat === undefined) {
-      throw new Error(`To use ApplicationLogLevel and/or SystemLogLevel you must set LogFormat to '${LogFormat.JSON}', got '${props.logFormat}'.`);
+    if (props.logFormat && props.loggingFormat) {
+      throw new Error('Only define LogFormat or LoggingFormat, not both.');
     }
 
-    if ((props.applicationLogLevel || props.systemLogLevel) && props.loggingFormat !== LoggingFormat.JSON && props.logFormat === undefined) {
-      throw new Error(`To use ApplicationLogLevel and/or SystemLogLevel you must set LoggingFormat to '${LoggingFormat.JSON}', got '${props.loggingFormat}'.`);
+    if (props.applicationLogLevel && props.applicationLogLevelV2) {
+      throw new Error('Only define applicationLogLevel or applicationLogLevelV2, not both.');
     }
 
-    if (props.logFormat && props.loggingFormat) {
-      throw new Error('Only define LogFormat or LoggingFormat, not both.');
+    if (props.systemLogLevel && props.systemLogLevelV2) {
+      throw new Error('Only define systemLogLevel or systemLogLevelV2, not both.');
+    }
+
+    if (props.applicationLogLevel || props.applicationLogLevelV2 || props.systemLogLevel || props.systemLogLevelV2) {
+      if (props.logFormat !== LoggingFormat.JSON && props.loggingFormat === undefined) {
+        throw new Error(`To use ApplicationLogLevel and/or SystemLogLevel you must set LogFormat to '${LogFormat.JSON}', got '${props.logFormat}'.`);
+      }
+
+      if (props.loggingFormat !== LoggingFormat.JSON && props.logFormat === undefined) {
+        throw new Error(`To use ApplicationLogLevel and/or SystemLogLevel you must set LoggingFormat to '${LoggingFormat.JSON}', got '${props.loggingFormat}'.`);
+      }
     }
 
     let loggingConfig: CfnFunction.LoggingConfigProperty;
     if (props.logFormat || props.logGroup || props.loggingFormat) {
       loggingConfig = {
         logFormat: props.logFormat || props.loggingFormat,
-        systemLogLevel: props.systemLogLevel,
-        applicationLogLevel: props.applicationLogLevel,
+        systemLogLevel: props.systemLogLevel || props.systemLogLevelV2,
+        applicationLogLevel: props.applicationLogLevel || props.applicationLogLevelV2,
         logGroup: props.logGroup?.logGroupName,
       };
       return loggingConfig;