diff --git a/api/versions.go b/api/versions.go
index e43149bc..8546e358 100644
--- a/api/versions.go
+++ b/api/versions.go
@@ -372,13 +372,21 @@ func (self *version2_0) HandleRequest(requestType string, request []string, m ma
 		if err != nil {
 			return err
 		}
-		contMetrics := make(map[string][][]info.Metric, 0)
-		metrics := [][]info.Metric{}
+		specs, err := m.GetContainerSpec(containerName, opt)
+		if err != nil {
+			return err
+		}
+		contMetrics := make(map[string]map[string][]info.MetricVal, 0)
 		for _, cont := range conts {
+			metrics := map[string][]info.MetricVal{}
 			contStats := convertStats(cont)
+			spec := specs[cont.Name]
 			for _, contStat := range contStats {
-				metric := contStat.CustomMetrics
-				metrics = append(metrics, metric)
+				for _, ms := range spec.CustomMetrics {
+					if contStat.HasCustomMetrics && !contStat.CustomMetrics[ms.Name].Timestamp.IsZero() {
+						metrics[ms.Name] = append(metrics[ms.Name], contStat.CustomMetrics[ms.Name])
+					}
+				}
 			}
 			contMetrics[containerName] = metrics
 		}
diff --git a/collector/collector_manager.go b/collector/collector_manager.go
index 9ac48f9a..bac016b3 100644
--- a/collector/collector_manager.go
+++ b/collector/collector_manager.go
@@ -61,20 +61,29 @@ func (cm *GenericCollectorManager) RegisterCollector(collector Collector) error
 	return nil
 }
 
-func (cm *GenericCollectorManager) Collect() (time.Time, []v1.Metric, error) {
+func (cm *GenericCollectorManager) GetSpec() ([]v1.MetricSpec, error) {
+	metricSpec := []v1.MetricSpec{}
+	for _, c := range cm.Collectors {
+		specs := c.collector.GetSpec()
+		metricSpec = append(metricSpec, specs...)
+	}
+
+	return metricSpec, nil
+}
+
+func (cm *GenericCollectorManager) Collect() (time.Time, map[string]v1.MetricVal, error) {
 	var errors []error
 
 	// Collect from all collectors that are ready.
 	var next time.Time
-	var metrics []v1.Metric
+	metrics := map[string]v1.MetricVal{}
 	for _, c := range cm.Collectors {
 		if c.nextCollectionTime.Before(time.Now()) {
-			nextCollection, newMetrics, err := c.collector.Collect()
+			var err error
+			c.nextCollectionTime, metrics, err = c.collector.Collect(metrics)
 			if err != nil {
 				errors = append(errors, err)
 			}
-			metrics = append(metrics, newMetrics...)
-			c.nextCollectionTime = nextCollection
 		}
 
 		// Keep track of the next collector that will be ready.
diff --git a/collector/collector_manager_test.go b/collector/collector_manager_test.go
index fd34d625..2ffb0087 100644
--- a/collector/collector_manager_test.go
+++ b/collector/collector_manager_test.go
@@ -28,15 +28,19 @@ type fakeCollector struct {
 	collectedFrom      int
 }
 
-func (fc *fakeCollector) Collect() (time.Time, []v1.Metric, error) {
+func (fc *fakeCollector) Collect(metric map[string]v1.MetricVal) (time.Time, map[string]v1.MetricVal, error) {
 	fc.collectedFrom++
-	return fc.nextCollectionTime, []v1.Metric{}, fc.err
+	return fc.nextCollectionTime, metric, fc.err
 }
 
 func (fc *fakeCollector) Name() string {
 	return "fake-collector"
 }
 
+func (fc *fakeCollector) GetSpec() []v1.MetricSpec {
+	return []v1.MetricSpec{}
+}
+
 func TestCollect(t *testing.T) {
 	cm := &GenericCollectorManager{}
 
diff --git a/collector/config.go b/collector/config.go
index d3deabf8..aad9a5cf 100644
--- a/collector/config.go
+++ b/collector/config.go
@@ -15,6 +15,7 @@
 package collector
 
 import (
+	"github.com/google/cadvisor/info/v1"
 	"time"
 )
 
@@ -32,7 +33,7 @@ type MetricConfig struct {
 	Name string `json:"name"`
 
 	//enum type for the metric type
-	MetricType MetricType `json:"metric_type"`
+	MetricType v1.MetricType `json:"metric_type"`
 
 	//data type of the metric (eg: integer, string)
 	Units string `json:"units"`
@@ -43,11 +44,3 @@ type MetricConfig struct {
 	//the regular expression that can be used to extract the metric
 	Regex string `json:"regex"`
 }
-
-// MetricType is an enum type that lists the possible type of the metric
-type MetricType string
-
-const (
-	Counter MetricType = "counter"
-	Gauge   MetricType = "gauge"
-)
diff --git a/collector/fakes.go b/collector/fakes.go
index 69b9787e..6b11acbb 100644
--- a/collector/fakes.go
+++ b/collector/fakes.go
@@ -27,7 +27,11 @@ func (fkm *FakeCollectorManager) RegisterCollector(collector Collector) error {
 	return nil
 }
 
-func (fkm *FakeCollectorManager) Collect() (time.Time, []v1.Metric, error) {
-	var zero time.Time
-	return zero, []v1.Metric{}, nil
+func (fkm *FakeCollectorManager) GetSpec() ([]v1.MetricSpec, error) {
+	return []v1.MetricSpec{}, nil
+}
+
+func (fkm *FakeCollectorManager) Collect(metric map[string]v1.MetricVal) (time.Time, map[string]v1.MetricVal, error) {
+	var zero time.Time
+	return zero, metric, nil
 }
diff --git a/collector/generic_collector.go b/collector/generic_collector.go
index 289274e9..9da06eb9 100644
--- a/collector/generic_collector.go
+++ b/collector/generic_collector.go
@@ -97,8 +97,24 @@ func (collector *GenericCollector) Name() string {
 	return collector.name
 }
 
+func (collector *GenericCollector) configToSpec(config MetricConfig) v1.MetricSpec {
+	return v1.MetricSpec{
+		Name: config.Name,
+		Type: config.MetricType,
+	}
+}
+
+func (collector *GenericCollector) GetSpec() []v1.MetricSpec {
+	specs := []v1.MetricSpec{}
+	for _, metricConfig := range collector.configFile.MetricsConfig {
+		spec := collector.configToSpec(metricConfig)
+		specs = append(specs, spec)
+	}
+	return specs
+}
+
 //Returns collected metrics and the next collection time of the collector
-func (collector *GenericCollector) Collect() (time.Time, []v1.Metric, error) {
+func (collector *GenericCollector) Collect(metrics map[string]v1.MetricVal) (time.Time, map[string]v1.MetricVal, error) {
 	currentTime := time.Now()
 	nextCollectionTime := currentTime.Add(time.Duration(collector.info.minPollingFrequency))
 
@@ -115,9 +131,7 @@ func (collector *GenericCollector) Collect() (time.Time, []v1.Metric, error) {
 		return nextCollectionTime, nil, err
 	}
 
-	metrics := make([]v1.Metric, len(collector.configFile.MetricsConfig))
 	var errorSlice []error
-
 	for ind, metricConfig := range collector.configFile.MetricsConfig {
 		matchString := collector.info.regexps[ind].FindStringSubmatch(string(pageContent))
 		if matchString != nil {
@@ -126,16 +140,16 @@ func (collector *GenericCollector) Collect() (time.Time, []v1.Metric, error) {
 				if err != nil {
 					errorSlice = append(errorSlice, err)
 				}
-				metrics[ind].FloatPoints = []v1.FloatPoint{
-					{Value: regVal, Timestamp: currentTime},
+				metrics[metricConfig.Name] = v1.MetricVal{
+					FloatValue: regVal, Timestamp: currentTime,
 				}
 			} else if metricConfig.Units == "integer" || metricConfig.Units == "int" {
 				regVal, err := strconv.ParseInt(strings.TrimSpace(matchString[1]), 10, 64)
 				if err != nil {
 					errorSlice = append(errorSlice, err)
 				}
-				metrics[ind].IntPoints = []v1.IntPoint{
-					{Value: regVal, Timestamp: currentTime},
+				metrics[metricConfig.Name] = v1.MetricVal{
+					IntValue: regVal, Timestamp: currentTime,
 				}
 
 			} else {
@@ -144,14 +158,6 @@ func (collector *GenericCollector) Collect() (time.Time, []v1.Metric, error) {
 		} else {
 			errorSlice = append(errorSlice, fmt.Errorf("No match found for regexp: %v for metric '%v' in config", metricConfig.Regex, metricConfig.Name))
 		}
-
-		metrics[ind].Name = metricConfig.Name
-		if metricConfig.MetricType == "gauge" {
-			metrics[ind].Type = v1.MetricGauge
-		} else if metricConfig.MetricType == "counter" {
-			metrics[ind].Type = v1.MetricCumulative
-		}
 	}
-
 	return nextCollectionTime, metrics, compileErrors(errorSlice)
 }
diff --git a/collector/generic_collector_test.go b/collector/generic_collector_test.go
index f6c014d6..33f71247 100644
--- a/collector/generic_collector_test.go
+++ b/collector/generic_collector_test.go
@@ -148,15 +148,20 @@ func TestMetricCollection(t *testing.T) {
 	defer tempServer.Close()
 	fakeCollector.configFile.Endpoint = tempServer.URL
 
-	_, metrics, errMetric := fakeCollector.Collect()
+	metrics := map[string]v1.MetricVal{}
+	_, metrics, errMetric := fakeCollector.Collect(metrics)
 	assert.NoError(errMetric)
-	assert.Equal(metrics[0].Name, "activeConnections")
-	assert.Equal(metrics[0].Type, v1.MetricGauge)
-	assert.Nil(metrics[0].FloatPoints)
-	assert.Equal(metrics[1].Name, "reading")
-	assert.Equal(metrics[2].Name, "writing")
-	assert.Equal(metrics[3].Name, "waiting")
-
-	//Assert: Number of active connections = Number of connections reading + Number of connections writing + Number of connections waiting
-	assert.Equal(metrics[0].IntPoints[0].Value, (metrics[1].IntPoints[0].Value)+(metrics[2].IntPoints[0].Value)+(metrics[3].IntPoints[0].Value))
+	metricNames := []string{"activeConnections", "reading", "writing", "waiting"}
+	// activeConnections = 3
+	assert.Equal(metrics[metricNames[0]].IntValue, 3)
+	assert.Equal(metrics[metricNames[0]].FloatValue, 0)
+	// reading = 0
+	assert.Equal(metrics[metricNames[1]].IntValue, 0)
+	assert.Equal(metrics[metricNames[1]].FloatValue, 0)
+	// writing = 1
+	assert.Equal(metrics[metricNames[2]].IntValue, 1)
+	assert.Equal(metrics[metricNames[2]].FloatValue, 0)
+	// waiting = 2
+	assert.Equal(metrics[metricNames[3]].IntValue, 2)
+	assert.Equal(metrics[metricNames[3]].FloatValue, 0)
 }
diff --git a/collector/types.go b/collector/types.go
index de977bbb..60851bee 100644
--- a/collector/types.go
+++ b/collector/types.go
@@ -27,7 +27,10 @@ type Collector interface {
 	// Returns the next time this collector should be collected from.
 	// Next collection time is always returned, even when an error occurs.
 	// A collection time of zero means no more collection.
-	Collect() (time.Time, []v1.Metric, error)
+	Collect(map[string]v1.MetricVal) (time.Time, map[string]v1.MetricVal, error)
+
+	// Return spec for all metrics associated with this collector
+	GetSpec() []v1.MetricSpec
 
 	// Name of this collector.
 	Name() string
@@ -42,5 +45,8 @@ type CollectorManager interface {
 	// at which a collector will be ready to collect from.
 	// Next collection time is always returned, even when an error occurs.
 	// A collection time of zero means no more collection.
-	Collect() (time.Time, []v1.Metric, error)
+	Collect() (time.Time, map[string]v1.MetricVal, error)
+
+	// Get metric spec from all registered collectors.
+	GetSpec() ([]v1.MetricSpec, error)
 }
diff --git a/info/v1/container.go b/info/v1/container.go
index 38e387a5..1788d581 100644
--- a/info/v1/container.go
+++ b/info/v1/container.go
@@ -59,7 +59,8 @@ type ContainerSpec struct {
 	// HasDiskIo when true, indicates that DiskIo stats will be available.
 	HasDiskIo bool `json:"has_diskio"`
 
-	HasCustomMetrics bool `json:"has_custom_metrics"`
+	HasCustomMetrics bool         `json:"has_custom_metrics"`
+	CustomMetrics    []MetricSpec `json:"custom_metrics,omitempty"`
 }
 
 // Container reference contains enough information to uniquely identify a container
@@ -426,7 +427,7 @@ type ContainerStats struct {
 	TaskStats LoadStats `json:"task_stats,omitempty"`
 
 	//Custom metrics from all collectors
-	CustomMetrics []Metric `json:"custom_metrics,omitempty"`
+	CustomMetrics map[string]MetricVal `json:"custom_metrics,omitempty"`
 }
 
 func timeEq(t1, t2 time.Time, tolerance time.Duration) bool {
diff --git a/info/v1/metric.go b/info/v1/metric.go
index 0311eed9..188dd978 100644
--- a/info/v1/metric.go
+++ b/info/v1/metric.go
@@ -32,38 +32,21 @@ const (
 	MetricDelta = "delta"
 )
 
-// An exported metric.
-type Metric struct {
+// Spec for custom metric.
+type MetricSpec struct {
 	// The name of the metric.
 	Name string `json:"name"`
 
 	// Type of the metric.
 	Type MetricType `json:"type"`
-
-	// Metadata associated with this metric.
-	Labels map[string]string
-
-	// Value of the metric. Only one of these values will be
-	// available according to the output type of the metric.
-	// If no values are available, there are no data points.
-	IntPoints   []IntPoint   `json:"int_points,omitempty"`
-	FloatPoints []FloatPoint `json:"float_points,omitempty"`
 }
 
-// An integer metric data point.
-type IntPoint struct {
+// An exported metric.
+type MetricVal struct {
 	// Time at which the metric was queried
 	Timestamp time.Time `json:"timestamp"`
 
 	// The value of the metric at this point.
-	Value int64 `json:"value"`
-}
-
-// A float metric data point.
-type FloatPoint struct {
-	// Time at which the metric was queried
-	Timestamp time.Time `json:"timestamp"`
-
-	// The value of the metric at this point.
-	Value float64 `json:"value"`
+	IntValue   int64   `json:"int_value,omitempty"`
+	FloatValue float64 `json:"float_value,omitempty"`
 }
diff --git a/info/v2/container.go b/info/v2/container.go
index 320f7775..e4bda16e 100644
--- a/info/v2/container.go
+++ b/info/v2/container.go
@@ -73,7 +73,8 @@ type ContainerSpec struct {
 	HasMemory bool       `json:"has_memory"`
 	Memory    MemorySpec `json:"memory,omitempty"`
 
-	HasCustomMetrics bool `json:"has_custom_metrics"`
+	HasCustomMetrics bool            `json:"has_custom_metrics"`
+	CustomMetrics    []v1.MetricSpec `json:"custom_metrics,omitempty"`
 
 	// Following resources have no associated spec, but are being isolated.
 	HasNetwork    bool `json:"has_network"`
@@ -102,9 +103,9 @@ type ContainerStats struct {
 	// Task load statistics
 	HasLoad bool         `json:"has_load"`
 	Load    v1.LoadStats `json:"load_stats,omitempty"`
-	//Custom statistics
-	HasCustomMetrics bool        `json:"has_custom_metrics"`
-	CustomMetrics    []v1.Metric `json:"custom_metrics,omitempty"`
+	// Custom Metrics
+	HasCustomMetrics bool                    `json:"has_custom_metrics"`
+	CustomMetrics    map[string]v1.MetricVal `json:"custom_metrics,omitempty"`
 }
 
 type Percentiles struct {
diff --git a/manager/container.go b/manager/container.go
index 2b0ba767..e6084801 100644
--- a/manager/container.go
+++ b/manager/container.go
@@ -439,6 +439,12 @@ func (c *containerData) updateSpec() error {
 		}
 		return err
 	}
+
+	customMetrics, err := c.collectorManager.GetSpec()
+	if len(customMetrics) > 0 {
+		spec.HasCustomMetrics = true
+		spec.CustomMetrics = customMetrics
+	}
 	c.lock.Lock()
 	defer c.lock.Unlock()
 	c.info.Spec = spec
@@ -523,7 +529,7 @@ func (c *containerData) updateStats() error {
 	return customStatsErr
 }
 
-func (c *containerData) updateCustomStats() ([]info.Metric, error) {
+func (c *containerData) updateCustomStats() (map[string]info.MetricVal, error) {
 	_, customStats, customStatsErr := c.collectorManager.Collect()
 	if customStatsErr != nil {
 		if !c.handler.Exists() {
diff --git a/manager/manager.go b/manager/manager.go
index 9a3ed239..751acb97 100644
--- a/manager/manager.go
+++ b/manager/manager.go
@@ -375,12 +375,13 @@ func (self *manager) GetContainerSpec(containerName string, options v2.RequestOp
 func (self *manager) getV2Spec(cinfo *containerInfo) v2.ContainerSpec {
 	specV1 := self.getAdjustedSpec(cinfo)
 	specV2 := v2.ContainerSpec{
-		CreationTime:  specV1.CreationTime,
-		HasCpu:        specV1.HasCpu,
-		HasMemory:     specV1.HasMemory,
-		HasFilesystem: specV1.HasFilesystem,
-		HasNetwork:    specV1.HasNetwork,
-		HasDiskIo:     specV1.HasDiskIo,
+		CreationTime:     specV1.CreationTime,
+		HasCpu:           specV1.HasCpu,
+		HasMemory:        specV1.HasMemory,
+		HasFilesystem:    specV1.HasFilesystem,
+		HasNetwork:       specV1.HasNetwork,
+		HasDiskIo:        specV1.HasDiskIo,
+		HasCustomMetrics: specV1.HasCustomMetrics,
 	}
 	if specV1.HasCpu {
 		specV2.Cpu.Limit = specV1.Cpu.Limit
@@ -392,6 +393,9 @@ func (self *manager) getV2Spec(cinfo *containerInfo) v2.ContainerSpec {
 		specV2.Memory.Reservation = specV1.Memory.Reservation
 		specV2.Memory.SwapLimit = specV1.Memory.SwapLimit
 	}
+	if specV1.HasCustomMetrics {
+		specV2.CustomMetrics = specV1.CustomMetrics
+	}
 	specV2.Aliases = cinfo.Aliases
 	specV2.Namespace = cinfo.Namespace
 	return specV2