fix(custom-resources): use loggingFormat instead of deprecated logFormat

packages/aws-cdk-lib/custom-resources/lib/provider-framework/provider.ts

@@ -324,7 +324,8 @@ export class Provider extends Construct implements ICustomResourceProvider {
       handler: `framework.${entrypoint}`,
       timeout: FRAMEWORK_HANDLER_TIMEOUT,
 
-      logFormat: lambda.LogFormat.JSON,
+      // Using loggingFormat instead of deprecated logFormat which will be removed in the next major release
+      loggingFormat: lambda.LoggingFormat.JSON,
       applicationLogLevelV2: loggingLevel,
       // props.logRetention is deprecated, make sure we only set it if it is actually provided
       // otherwise jsii will print warnings even for users that don't use this directly

packages/aws-cdk-lib/custom-resources/test/provider-framework/provider.test.ts

@@ -365,6 +365,37 @@ test('Log level are set to FATAL by default', () => {
   });
 });
 
+test('uses loggingFormat instead of deprecated logFormat', () => {
+  // GIVEN
+  // Spy on console.warn to check for deprecation warnings
+  // eslint-disable-next-line no-console
+  const warnSpy = jest.spyOn(console, 'warn').mockImplementation(() => { });
+
+  const stack = new Stack();
+  const handler = new lambda.Function(stack, 'MyHandler', {
+    code: new lambda.InlineCode('foo'),
+    handler: 'index.onEvent',
+    runtime: lambda.Runtime.NODEJS_LATEST,
+  });
+
+  try {
+    // WHEN
+    new cr.Provider(stack, 'MyProvider', {
+      onEventHandler: handler,
+    });
+
+    // THEN
+    // Check that no deprecation warnings related to logFormat were emitted
+    const deprecationWarnings = warnSpy.mock.calls
+      .filter(args => typeof args[0] === 'string' && args[0].includes('logFormat is deprecated'));
+
+    expect(deprecationWarnings.length).toBe(0);
+  } finally {
+    // Clean up
+    warnSpy.mockRestore();
+  }
+});
+
 describe('retry policy', () => {
   const stack = new Stack();