feat(logs): add parameter to allow metric filter on transformed logs

packages/aws-cdk-lib/aws-logs/lib/log-group.ts

@@ -803,6 +803,14 @@ export interface MetricFilterOptions {
    * @default - Cloudformation generated name.
    */
   readonly filterName?: string;
+
+  /**
+   * Whether the metric filter is applied on the tranformed logs. This parameter is valid only for log groups that have an active log transformer.
+   * If this value is true, the metric filter is applied on the transformed version of the log events instead of the original ingested log events.
+   *
+   * @default - false
+   */
+  readonly applyOnTransformedLogs?: boolean;
 }
 
 /**

packages/aws-cdk-lib/aws-logs/lib/metric-filter.ts

@@ -61,6 +61,7 @@ export class MetricFilter extends Resource {
         dimensions: props.dimensions ? Object.entries(props.dimensions).map(([key, value]) => ({ key, value })) : undefined,
         unit: props.unit,
       }],
+      applyOnTransformedLogs: props.applyOnTransformedLogs
     });
   }