chore: correct trackDuration event key to $ld:ai:graph:duration:total

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: jsonbailey

packages/sdk/server-ai/__tests__/LDGraphTrackerImpl.test.ts

@@ -173,7 +173,7 @@ it('trackDuration sets durationMs and emits event', () => {
   tracker.trackDuration(1234);
   expect(tracker.getSummary().durationMs).toBe(1234);
   expect(mockTrack).toHaveBeenCalledWith(
-    '$ld:ai:duration:total',
+    '$ld:ai:graph:duration:total',
     testContext,
     tracker.getTrackData(),
     1234,

packages/sdk/server-ai/src/LDGraphTrackerImpl.ts

@@ -112,7 +112,12 @@ export class LDGraphTrackerImpl implements LDGraphTracker {
       return;
     }
     this._summary.durationMs = durationMs;
-    this._ldClient.track('$ld:ai:duration:total', this._context, this.getTrackData(), durationMs);
+    this._ldClient.track(
+      '$ld:ai:graph:duration:total',
+      this._context,
+      this.getTrackData(),
+      durationMs,
+    );
   }
 
   trackTotalTokens(tokens: LDTokenUsage): void {

packages/sdk/server-ai/src/api/graph/LDGraphTracker.ts

@@ -63,7 +63,7 @@ export interface LDGraphTracker {
 
   /**
    * Tracks the total duration of the graph execution in milliseconds.
-   * Emits event `$ld:ai:duration:total` with the duration as the metric value.
+   * Emits event `$ld:ai:graph:duration:total` with the duration as the metric value.
    * At-most-once: subsequent calls are dropped with a warning.
    *
    * @param durationMs Duration in milliseconds.