fix: address Code Reviewer findings for Datadog/Sentry integration FRE-4806

P1: Load dd-trace before other modules via datadog-init.ts entry point
P1: Batch all CloudWatch metrics into single PutMetricDataCommand per request
P2: Deduplicate warning logs with else-if for high latency vs error
P3: Add response.ok check to Datadog log forwarding fetch
P3: Update getSentryHub() to use getCurrentScope() for Sentry SDK 8.x

Co-Authored-By: Paperclip <noreply@paperclip.ing>

packages/monitoring/src/cloudwatch.ts

@@ -62,6 +62,35 @@ export async function emitMetric(
   }
 }
 
+export async function emitBatchMetrics(metrics: {
+  serviceName: string;
+  data: { metricName: string; value: number; unit: StandardUnit; dimensions?: Record<string, string> }[];
+}) {
+  const cw = getClient();
+  if (!cw) return;
+
+  const metricData = metrics.data.map((m) => ({
+    MetricName: m.metricName,
+    Dimensions: [
+      { Name: 'service', Value: metrics.serviceName },
+      ...(m.dimensions ? Object.entries(m.dimensions).map(([n, v]) => ({ Name: n, Value: v })) : []),
+    ],
+    Value: m.value,
+    Unit: m.unit,
+  }));
+
+  const command = new PutMetricDataCommand({
+    Namespace: NAMESPACE,
+    MetricData: metricData,
+  });
+
+  try {
+    await cw.send(command);
+  } catch (err) {
+    console.warn('[CloudWatch] Batch metric emit failed:', (err as Error).message);
+  }
+}
+
 export async function emitLatency(
   serviceName: string,
   latencyMs: number,