Update outbound telemetry debug example

The debug exporter example now records the outbound activity ID and inbox
URL from the sent activity event attributes instead of parsing the removed
activity JSON event attribute.

Assisted-by: gpt-5.5

Author: dahlia

docs/manual/opentelemetry.md

@@ -408,13 +408,22 @@ ActivityPub activities for a debug dashboard:
 import type { SpanExporter, ReadableSpan } from "@opentelemetry/sdk-trace-base";
 import { ExportResultCode } from "@opentelemetry/core";
 
-interface ActivityRecord {
-  direction: "inbound" | "outbound";
+interface InboundActivityRecord {
+  direction: "inbound";
   activity: unknown;
   timestamp: Date;
   verified?: boolean;
 }
 
+interface OutboundActivityRecord {
+  direction: "outbound";
+  activityId?: string;
+  inboxUrl?: string;
+  timestamp: Date;
+}
+
+type ActivityRecord = InboundActivityRecord | OutboundActivityRecord;
+
 export class FedifyDebugExporter implements SpanExporter {
   private activities: ActivityRecord[] = [];
 
@@ -443,11 +452,16 @@ export class FedifyDebugExporter implements SpanExporter {
           (e) => e.name === "activitypub.activity.sent"
         );
         if (event && event.attributes) {
+          const activityId = event.attributes[
+            "activitypub.activity.id"
+          ] as string | undefined;
+          const inboxUrl = event.attributes[
+            "activitypub.inbox.url"
+          ] as string | undefined;
           this.activities.push({
             direction: "outbound",
-            activity: JSON.parse(
-              event.attributes["activitypub.activity.json"] as string
-            ),
+            activityId,
+            inboxUrl,
             timestamp: new Date(span.startTime[0] * 1000),
           });
         }