Flaky test: TestMetricsNodeSamplerGRPC/basic

[Elana Hashman]

Per https://testgrid.k8s.io/sig-instrumentation-usage-metrics-collector#periodic-test&width=20

sigs.k8s.io/usage-metrics-collector/cmd/metrics-node-sampler/integration.TestMetricsNodeSamplerGRPC/basic test is frequently flaking.

Example failure: https://prow.k8s.io/view/gs/kubernetes-jenkins/logs/ci-usage-metrics-collector-test/1765441415891914752

    	            	Diff:
    	            	--- Expected
    	            	+++ Actual
    	            	@@ -169,2 +169,3 @@
    	            	 				"cpuCoresNanoSec": [
    	            	+					"1000",
    	            	 					"1000"
    	            	@@ -172,2 +173,3 @@
    	            	 				"memoryBytes": [
    	            	+					"0",
    	            	 					"0"
    	Test:       	TestMetricsNodeSamplerGRPC/basic
--- FAIL: TestMetricsNodeSamplerGRPC/basic (12.12s)

It appears there is an additional sample being returned vs. what's expected. Perhaps someone can look into why this is happening.

[Elana Hashman]

/triage accepted