track whether enhanced feature flags were loaded

Author: linglingye001

src/appConfigurationImpl.ts

@@ -97,6 +97,7 @@ export class AzureAppConfigurationImpl implements AzureAppConfiguration {
     #fmVersion: string | undefined;
     #aiConfigurationTracing: AIConfigurationTracingOptions | undefined;
     #useSnapshotReference: boolean = false;
+    #useEnhancedFeatureFlag: boolean = false;
 
     // Refresh
     #refreshInProgress: boolean = false;
@@ -240,7 +241,8 @@ export class AzureAppConfigurationImpl implements AzureAppConfiguration {
             fmVersion: this.#fmVersion,
             aiConfigurationTracing: this.#aiConfigurationTracing,
             isAfdUsed: this.#isAfdUsed,
-            useSnapshotReference: this.#useSnapshotReference
+            useSnapshotReference: this.#useSnapshotReference,
+            useEnhancedFeatureFlag: this.#useEnhancedFeatureFlag
         };
     }
 
@@ -675,6 +677,9 @@ export class AzureAppConfigurationImpl implements AzureAppConfiguration {
             this.#featureFlagTracing.reset();
         }
 
+        // Track whether enhanced feature flags were loaded.
+        this.#useEnhancedFeatureFlag = featureFlags.length > 0;
+
         // Exclude any classic feature flags that are superseded by a standalone feature flag with the same name.
         const ineligibleClassicFfKeys = new Set(featureFlags.map(ff => featureFlagPrefix + ff.name));
         const eligibleClassicFeatureFlags = await Promise.all(

src/requestTracing/constants.ts

@@ -53,6 +53,7 @@ export const KEY_VAULT_REFRESH_CONFIGURED_TAG = "RefreshesKeyVault";
 export const FAILOVER_REQUEST_TAG = "Failover";
 export const AFD_USED_TAG = "AFD";
 export const SNAPSHOT_REFERENCE_TAG = "SnapshotRef";
+export const ENHANCED_FEATURE_FLAG_TAG = "EnhFF";
 
 // Compact feature tags
 export const FEATURES_KEY = "Features";

src/requestTracing/utils.ts

@@ -35,7 +35,8 @@ import {
     DELIMITER,
     AI_CONFIGURATION_TAG,
     AI_CHAT_COMPLETION_CONFIGURATION_TAG,
-    SNAPSHOT_REFERENCE_TAG
+    SNAPSHOT_REFERENCE_TAG,
+    ENHANCED_FEATURE_FLAG_TAG
 } from "./constants.js";
 
 export interface RequestTracingOptions {
@@ -49,6 +50,7 @@ export interface RequestTracingOptions {
     fmVersion: string | undefined;
     aiConfigurationTracing: AIConfigurationTracingOptions | undefined;
     useSnapshotReference: boolean;
+    useEnhancedFeatureFlag: boolean;
 }
 
 // Utils
@@ -161,6 +163,9 @@ function createFeaturesString(requestTracingOptions: RequestTracingOptions): str
     if (requestTracingOptions.useSnapshotReference) {
         tags.push(SNAPSHOT_REFERENCE_TAG);
     }
+    if (requestTracingOptions.useEnhancedFeatureFlag) {
+        tags.push(ENHANCED_FEATURE_FLAG_TAG);
+    }
     return tags.join(DELIMITER);
 }