Don't report FS stats for system containers

pkg/kubelet/server/stats/summary.go

@@ -146,7 +146,11 @@ func (sb *summaryBuilder) build() (*stats.Summary, error) {
 	}
 	for sys, name := range systemContainers {
 		if info, ok := sb.infos[name]; ok {
-			nodeStats.SystemContainers = append(nodeStats.SystemContainers, sb.containerInfoV2ToStats(sys, &info))
+			sysCont := sb.containerInfoV2ToStats(sys, &info)
+			// System containers don't have a filesystem associated with them.
+			sysCont.Rootfs = nil
+			sysCont.Logs = nil
+			nodeStats.SystemContainers = append(nodeStats.SystemContainers, sysCont)
 		}
 	}
 

pkg/kubelet/server/stats/summary_test.go

@@ -183,8 +183,8 @@ func TestBuildSummary(t *testing.T) {
 		assert.EqualValues(t, testTime(creationTime, seed).Unix(), sys.StartTime.Time.Unix(), name+".StartTime")
 		checkCPUStats(t, name, seed, sys.CPU)
 		checkMemoryStats(t, name, seed, info, sys.Memory)
-		checkFsStats(t, rootfsCapacity, rootfsAvailable, totalRootfsInodes, rootfsInodesFree, sys.Logs)
-		checkFsStats(t, imagefsCapacity, imagefsAvailable, totalImagefsInodes, imagefsInodesFree, sys.Rootfs)
+		assert.Nil(t, sys.Logs, name+".Logs")
+		assert.Nil(t, sys.Rootfs, name+".Rootfs")
 	}
 
 	assert.Equal(t, 3, len(summary.Pods))

test/e2e_node/summary_test.go

@@ -74,9 +74,8 @@ var _ = framework.KubeDescribe("Summary API", func() {
 					"PageFaults":      bounded(1000, 1E9),
 					"MajorPageFaults": bounded(0, 100000),
 				}),
-				// TODO(#31999): Don't report FS stats for system containers.
-				"Rootfs":             gstruct.Ignore(),
-				"Logs":               gstruct.Ignore(),
+				"Rootfs":             BeNil(),
+				"Logs":               BeNil(),
 				"UserDefinedMetrics": BeEmpty(),
 			})
 			// Expectations for pods.