fix: recursive require in test env

server/logging/Metrics.ts

@@ -1,6 +1,5 @@
 import ddMetrics from "datadog-metrics";
 import env from "@server/env";
-import ShutdownHelper, { ShutdownOrder } from "@server/utils/ShutdownHelper";
 
 class Metrics {
   enabled = !!env.DD_API_KEY;
@@ -15,8 +14,6 @@ class Metrics {
       prefix: "outline.",
       defaultTags: [`env:${process.env.DD_ENV ?? env.ENVIRONMENT}`],
     });
-
-    ShutdownHelper.add("metrics", ShutdownOrder.last, () => this.flush());
   }
 
   gauge(key: string, value: number, tags?: string[]): void {