fix clusterloader2 arg

Author: upodroid

tests/e2e/scenarios/scalability/run-test.sh

@@ -206,7 +206,7 @@ else
   CLUSTERLOADER2_ARGS+=("--test-overrides=${GOPATH}/src/k8s.io/perf-tests/clusterloader2/testing/experiments/enable_restart_count_check.yaml")
   CLUSTERLOADER2_ARGS+=("--test-overrides=${GOPATH}/src/k8s.io/perf-tests/clusterloader2/testing/experiments/ignore_known_gce_container_restarts.yaml")
   CLUSTERLOADER2_ARGS+=("--test-overrides=${GOPATH}/src/k8s.io/perf-tests/clusterloader2/testing/overrides/5000_nodes.yaml")
-  CLUSTERLOADER2_ARGS+=("--experimental-prometheus-snapshot-to-report-dir=true")
+  CLUSTERLOADER2_ARGS+=("--extra-args=--experimental-prometheus-snapshot-to-report-dir=true")
 fi
 
 if [[ "${SCALE_SCENARIO:performance}" == "correctness" ]]; then