feat(platform): mesh federation live diagnostics span (v0.8.625)

Log federation live metadata when exporting mesh replication diagnostics.

Co-authored-by: Cursor <[email protected]>

index.js

@@ -760,6 +760,21 @@ class PearcordPlatform extends EventEmitter {
     return extra
   }
 
+  _logMeshFederationLive (action, extra = {}) {
+    const guildId = extra.guildId || this.guild?.guild?.id
+    const span = this.log.time('guild.mesh.federation.live', {
+      spanKind: 'guild.mesh.federation.live',
+      action,
+      guildId: guildId || null,
+      meshPeerCount: this.guild?.peers?.size ?? 0,
+      federationPeerTarget: extra.federationPeerTarget ?? 8,
+      topicPool: this._guildTopicPool?.snapshot?.() || null,
+      ...extra
+    })
+    span.end(extra)
+    return extra
+  }
+
   _reactionTombstoneKey (key, guildId) {
     return `${guildId || ''}:${key.channelId}:${key.messageId}:${key.emoji}:${key.userId}`
   }
@@ -5003,6 +5018,13 @@ class PearcordPlatform extends EventEmitter {
 
   exportMeshReplicationDiagnostics (guildId) {
     const id = guildId || this.guild?.guild?.id
+    if (id) {
+      this._logMeshFederationLive('export-diagnostics', {
+        guildId: id,
+        federationPeerTarget: 8,
+        meshPeerCount: this.guild?.peers?.size ?? 0
+      })
+    }
     return {
       exportedAt: Date.now(),
       guildId: id,