complete performance and reliability follow-ups

packages/observability/src/diagnostics.ts

@@ -0,0 +1,14 @@
+export type ObservabilityDiagnostic = (message: string, error: unknown) => void;
+
+/** Report exporter failures without feeding them back through the exporter. */
+export function reportObservabilityFailure(
+  message: string,
+  error: unknown,
+  diagnostic?: ObservabilityDiagnostic,
+): void {
+  if (diagnostic) {
+    diagnostic(message, error);
+    return;
+  }
+  console.warn(`[wrnexus:observability] ${message}`, error);
+}