Merge pull request #400 from liubin/wip/add-pod-overhead

runtime: add pod overhead metrics

src/runtime/virtcontainers/interfaces.go

@@ -68,6 +68,8 @@ type VCSandbox interface {
 	ID() string
 	SetAnnotations(annotations map[string]string) error
 
+	Stats() (SandboxStats, error)
+
 	Start() error
 	Stop(force bool) error
 	Release() error

src/runtime/virtcontainers/pkg/vcmock/sandbox.go

@@ -125,6 +125,9 @@ func (s *Sandbox) StatusContainer(contID string) (vc.ContainerStatus, error) {
 
 // StatsContainer implements the VCSandbox function of the same name.
 func (s *Sandbox) StatsContainer(contID string) (vc.ContainerStats, error) {
+	if s.StatsContainerFunc != nil {
+		return s.StatsContainerFunc(contID)
+	}
 	return vc.ContainerStats{}, nil
 }
 
@@ -232,3 +235,11 @@ func (s *Sandbox) GetAgentMetrics() (string, error) {
 	}
 	return "", nil
 }
+
+// Stats implements the VCSandbox function of the same name.
+func (s *Sandbox) Stats() (vc.SandboxStats, error) {
+	if s.StatsFunc != nil {
+		return s.StatsFunc()
+	}
+	return vc.SandboxStats{}, nil
+}

src/runtime/virtcontainers/pkg/vcmock/types.go

@@ -66,6 +66,7 @@ type Sandbox struct {
 	ListRoutesFunc           func() ([]*vcTypes.Route, error)
 	UpdateRuntimeMetricsFunc func() error
 	GetAgentMetricsFunc      func() (string, error)
+	StatsFunc                func() (vc.SandboxStats, error)
 }
 
 // Container is a fake Container type used for testing