Use typealias for containerd metrics

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>

pkg/server/container_stats_list_unix.go

@@ -19,8 +19,8 @@ limitations under the License.
 package server
 
 import (
-	"github.com/containerd/cgroups"
 	"github.com/containerd/containerd/api/types"
+	v1 "github.com/containerd/containerd/metrics/types/v1"
 	"github.com/containerd/typeurl"
 	"github.com/pkg/errors"
 	runtime "k8s.io/cri-api/pkg/apis/runtime/v1alpha2"
@@ -61,7 +61,7 @@ func (c *criService) containerMetrics(
 		if err != nil {
 			return nil, errors.Wrap(err, "failed to extract container metrics")
 		}
-		metrics := s.(*cgroups.Metrics)
+		metrics := s.(*v1.Metrics)
 		if metrics.CPU != nil && metrics.CPU.Usage != nil {
 			cs.Cpu = &runtime.CpuUsage{
 				Timestamp:            stats.Timestamp.UnixNano(),
@@ -84,7 +84,7 @@ func (c *criService) containerMetrics(
 // getWorkingSet calculates workingset memory from cgroup memory stats.
 // The caller should make sure memory is not nil.
 // workingset = usage - total_inactive_file
-func getWorkingSet(memory *cgroups.MemoryStat) uint64 {
+func getWorkingSet(memory *v1.MemoryStat) uint64 {
 	if memory.Usage == nil {
 		return 0
 	}

vendor/github.com/containerd/cgroups/go.mod

@@ -1,13 +0,0 @@
-module github.com/containerd/cgroups
-
-go 1.12
-
-require (
-	github.com/coreos/go-systemd v0.0.0-20190321100706-95778dfbb74e
-	github.com/docker/go-units v0.4.0
-	github.com/godbus/dbus v0.0.0-20190422162347-ade71ed3457e
-	github.com/gogo/protobuf v1.2.1
-	github.com/opencontainers/runtime-spec v0.1.2-0.20190507144316-5b71a03e2700
-	github.com/pkg/errors v0.8.1
-	golang.org/x/sys v0.0.0-20190514135907-3a4b5fb9f71f
-)