[CI] Add requests/limits to metrics pod

If we do not add these, the metrics pod will often get killed as if it
OOMed even though it is using a reasonable amount of memory.

Author: boomanaiden154

premerge/metrics_deployment.yaml

@@ -34,3 +34,10 @@ spec:
             secretKeyRef:
               name: metrics-secrets
               key: grafana-metrics-userid
+        resources:
+          requests:
+            cpu: "250m"
+            memory: "512Mi"
+          limits:
+            cpu: "2"
+            memory: "1Gi"