Make summary timestamps more granular

pkg/kubelet/server/stats/summary.go

@@ -100,10 +100,6 @@ func (sb *summaryBuilder) build() (*Summary, error) {
 	if !found {
 		return nil, fmt.Errorf("Missing stats for root container")
 	}
-	cstat, found := sb.latestContainerStats(&rootInfo)
-	if !found {
-		return nil, fmt.Errorf("Missing stats for root container")
-	}
 
 	rootStats := sb.containerInfoV2ToStats("", &rootInfo)
 	nodeStats := NodeStats{
@@ -130,7 +126,6 @@ func (sb *summaryBuilder) build() (*Summary, error) {
 	}
 
 	summary := Summary{
-		Time: unversioned.NewTime(cstat.Timestamp),
 		Node: nodeStats,
 		Pods: sb.buildSummaryPods(),
 	}
@@ -250,15 +245,17 @@ func (sb *summaryBuilder) containerInfoV2ToStats(
 	name string,
 	info *cadvisorapiv2.ContainerInfo) ContainerStats {
 	stats := ContainerStats{
-		Name:      name,
 		StartTime: unversioned.NewTime(info.Spec.CreationTime),
+		Name:      name,
 	}
 	cstat, found := sb.latestContainerStats(info)
 	if !found {
 		return stats
 	}
 	if info.Spec.HasCpu {
-		cpuStats := CPUStats{}
+		cpuStats := CPUStats{
+			Time: unversioned.NewTime(cstat.Timestamp),
+		}
 		if cstat.CpuInst != nil {
 			cpuStats.UsageNanoCores = &cstat.CpuInst.Usage.Total
 		}
@@ -271,6 +268,7 @@ func (sb *summaryBuilder) containerInfoV2ToStats(
 		pageFaults := cstat.Memory.ContainerData.Pgfault
 		majorPageFaults := cstat.Memory.ContainerData.Pgmajfault
 		stats.Memory = &MemoryStats{
+			Time:            unversioned.NewTime(cstat.Timestamp),
 			UsageBytes:      &cstat.Memory.Usage,
 			WorkingSetBytes: &cstat.Memory.WorkingSet,
 			PageFaults:      &pageFaults,
@@ -304,6 +302,7 @@ func (sb *summaryBuilder) containerInfoV2ToNetworkStats(info *cadvisorapiv2.Cont
 		txErrors += inter.TxErrors
 	}
 	return &NetworkStats{
+		Time:     unversioned.NewTime(cstat.Timestamp),
 		RxBytes:  &rxBytes,
 		RxErrors: &rxErrors,
 		TxBytes:  &txBytes,
@@ -353,6 +352,7 @@ func (sb *summaryBuilder) containerInfoV2ToUserDefinedMetrics(info *cadvisorapiv
 	for _, specVal := range udmMap {
 		udm = append(udm, UserDefinedMetric{
 			UserDefinedMetricDescriptor: specVal.ref,
+			Time:  unversioned.NewTime(specVal.time),
 			Value: specVal.value,
 		})
 	}

pkg/kubelet/server/stats/summary_test.go

@@ -26,6 +26,7 @@ import (
 	"github.com/stretchr/testify/assert"
 
 	"k8s.io/kubernetes/pkg/api"
+	"k8s.io/kubernetes/pkg/api/unversioned"
 	"k8s.io/kubernetes/pkg/kubelet/cm"
 	"k8s.io/kubernetes/pkg/kubelet/leaky"
 )
@@ -44,6 +45,11 @@ const (
 	offsetNetTxErrors
 )
 
+var (
+	timestamp    = time.Now()
+	creationTime = timestamp.Add(-5 * time.Minute)
+)
+
 func TestBuildSummary(t *testing.T) {
 	node := api.Node{}
 	node.Name = "FooNode"
@@ -111,6 +117,7 @@ func TestBuildSummary(t *testing.T) {
 	assert.NoError(t, err)
 	nodeStats := summary.Node
 	assert.Equal(t, "FooNode", nodeStats.NodeName)
+	assert.EqualValues(t, testTime(creationTime, seedRoot).Unix(), nodeStats.StartTime.Time.Unix())
 	checkCPUStats(t, "Node", seedRoot, nodeStats.CPU)
 	checkMemoryStats(t, "Node", seedRoot, nodeStats.Memory)
 	checkNetworkStats(t, "Node", seedRoot, nodeStats.Network)
@@ -126,6 +133,7 @@ func TestBuildSummary(t *testing.T) {
 		if !found {
 			t.Errorf("Unknown SystemContainer: %q", name)
 		}
+		assert.EqualValues(t, testTime(creationTime, seed).Unix(), sys.StartTime.Time.Unix(), name+".StartTime")
 		checkCPUStats(t, name, seed, sys.CPU)
 		checkMemoryStats(t, name, seed, sys.Memory)
 	}
@@ -145,13 +153,16 @@ func TestBuildSummary(t *testing.T) {
 		indexCon[con.Name] = con
 	}
 	con := indexCon[cName00]
+	assert.EqualValues(t, testTime(creationTime, seedPod0Container0).Unix(), con.StartTime.Time.Unix())
 	checkCPUStats(t, "container", seedPod0Container0, con.CPU)
 	checkMemoryStats(t, "container", seedPod0Container0, con.Memory)
 
 	con = indexCon[cName01]
+	assert.EqualValues(t, testTime(creationTime, seedPod0Container1).Unix(), con.StartTime.Time.Unix())
 	checkCPUStats(t, "container", seedPod0Container1, con.CPU)
 	checkMemoryStats(t, "container", seedPod0Container1, con.Memory)
 
+	assert.EqualValues(t, testTime(creationTime, seedPod0Infra).Unix(), ps.StartTime.Time.Unix())
 	checkNetworkStats(t, "Pod", seedPod0Infra, ps.Network)
 
 	// Validate Pod1 Results
@@ -231,6 +242,7 @@ func summaryTestContainerInfo(seed int, podName string, podNamespace string, con
 		}
 	}
 	spec := v2.ContainerSpec{
+		CreationTime:  testTime(creationTime, seed),
 		HasCpu:        true,
 		HasMemory:     true,
 		HasNetwork:    true,
@@ -239,8 +251,9 @@ func summaryTestContainerInfo(seed int, podName string, podNamespace string, con
 	}
 
 	stats := v2.ContainerStats{
-		Cpu:     &v1.CpuStats{},
-		CpuInst: &v2.CpuInstStats{},
+		Timestamp: testTime(timestamp, seed),
+		Cpu:       &v1.CpuStats{},
+		CpuInst:   &v2.CpuInstStats{},
 		Memory: &v1.MemoryStats{
 			Usage:      uint64(seed + offsetMemUsageBytes),
 			WorkingSet: uint64(seed + offsetMemWorkingSetBytes),
@@ -267,7 +280,12 @@ func summaryTestContainerInfo(seed int, podName string, podNamespace string, con
 	}
 }
 
+func testTime(base time.Time, seed int) time.Time {
+	return base.Add(time.Duration(seed) * time.Second)
+}
+
 func checkNetworkStats(t *testing.T, label string, seed int, stats *NetworkStats) {
+	assert.EqualValues(t, testTime(timestamp, seed).Unix(), stats.Time.Time.Unix(), label+".Net.Time")
 	assert.EqualValues(t, seed+offsetNetRxBytes, *stats.RxBytes, label+".Net.RxBytes")
 	assert.EqualValues(t, seed+offsetNetRxErrors, *stats.RxErrors, label+".Net.RxErrors")
 	assert.EqualValues(t, seed+offsetNetTxBytes, *stats.TxBytes, label+".Net.TxBytes")
@@ -275,11 +293,13 @@ func checkNetworkStats(t *testing.T, label string, seed int, stats *NetworkStats
 }
 
 func checkCPUStats(t *testing.T, label string, seed int, stats *CPUStats) {
+	assert.EqualValues(t, testTime(timestamp, seed).Unix(), stats.Time.Time.Unix(), label+".CPU.Time")
 	assert.EqualValues(t, seed+offsetCPUUsageCores, *stats.UsageNanoCores, label+".CPU.UsageCores")
 	assert.EqualValues(t, seed+offsetCPUUsageCoreSeconds, *stats.UsageCoreNanoSeconds, label+".CPU.UsageCoreSeconds")
 }
 
 func checkMemoryStats(t *testing.T, label string, seed int, stats *MemoryStats) {
+	assert.EqualValues(t, testTime(timestamp, seed).Unix(), stats.Time.Time.Unix(), label+".Mem.Time")
 	assert.EqualValues(t, seed+offsetMemUsageBytes, *stats.UsageBytes, label+".Mem.UsageBytes")
 	assert.EqualValues(t, seed+offsetMemWorkingSetBytes, *stats.WorkingSetBytes, label+".Mem.WorkingSetBytes")
 	assert.EqualValues(t, seed+offsetMemPageFaults, *stats.PageFaults, label+".Mem.PageFaults")
@@ -301,24 +321,26 @@ func TestCustomMetrics(t *testing.T) {
 			Units:  "count",
 		},
 	}
+	timestamp1 := time.Now()
+	timestamp2 := time.Now().Add(time.Minute)
 	metrics := map[string][]v1.MetricVal{
 		"qos": {
 			{
-				Timestamp: time.Now(),
+				Timestamp: timestamp1,
 				IntValue:  10,
 			},
 			{
-				Timestamp: time.Now().Add(time.Minute),
+				Timestamp: timestamp2,
 				IntValue:  100,
 			},
 		},
 		"cpuLoad": {
 			{
-				Timestamp:  time.Now(),
+				Timestamp:  timestamp1,
 				FloatValue: 1.2,
 			},
 			{
-				Timestamp:  time.Now().Add(time.Minute),
+				Timestamp:  timestamp2,
 				FloatValue: 2.1,
 			},
 		},
@@ -341,6 +363,7 @@ func TestCustomMetrics(t *testing.T) {
 				Type:  MetricGauge,
 				Units: "per second",
 			},
+			Time:  unversioned.NewTime(timestamp2),
 			Value: 100,
 		},
 		UserDefinedMetric{
@@ -349,6 +372,7 @@ func TestCustomMetrics(t *testing.T) {
 				Type:  MetricCumulative,
 				Units: "count",
 			},
+			Time:  unversioned.NewTime(timestamp2),
 			Value: 2.1,
 		})
 }

pkg/kubelet/server/stats/types.go

@@ -22,9 +22,6 @@ import (
 
 // Summary is a top-level container for holding NodeStats and PodStats.
 type Summary struct {
-	// The time the most recent data included in this summary was collect at, rounded to the nearest
-	// second.
-	Time unversioned.Time `json:"time"`
 	// Overall node stats.
 	Node NodeStats `json:"node"`
 	// Per-pod stats.
@@ -104,6 +101,8 @@ type PodReference struct {
 
 // NetworkStats contains data about network resources.
 type NetworkStats struct {
+	// The time at which these stats were updated.
+	Time unversioned.Time `json:"time"`
 	// Cumulative count of bytes received.
 	RxBytes *uint64 `json:"rxBytes,omitempty"`
 	// Cumulative count of receive errors encountered.
@@ -116,6 +115,8 @@ type NetworkStats struct {
 
 // CPUStats contains data about CPU usage.
 type CPUStats struct {
+	// The time at which these stats were updated.
+	Time unversioned.Time `json:"time"`
 	// Total CPU usage (sum of all cores) averaged over the sample window.
 	// The "core" unit can be interpreted as CPU core-nanoseconds per second.
 	UsageNanoCores *uint64 `json:"usageNanoCores,omitempty"`
@@ -125,6 +126,8 @@ type CPUStats struct {
 
 // MemoryStats contains data about memory usage.
 type MemoryStats struct {
+	// The time at which these stats were updated.
+	Time unversioned.Time `json:"time"`
 	// Total memory in use. This includes all memory regardless of when it was accessed.
 	UsageBytes *uint64 `json:"usageBytes,omitempty"`
 	// The amount of working set memory. This includes recently accessed memory,
@@ -188,6 +191,8 @@ type UserDefinedMetricDescriptor struct {
 // UserDefinedMetric represents a metric defined and generate by users.
 type UserDefinedMetric struct {
 	UserDefinedMetricDescriptor `json:",inline"`
+	// The time at which these stats were updated.
+	Time unversioned.Time `json:"time"`
 	// Value of the metric. Float64s have 53 bit precision.
 	// We do not forsee any metrics exceeding that value.
 	Value float64 `json:"value"`