bump(google/cadvisor): v0.23.5

Fix an issue where cadvisor was unable to report container filesystem stats for LVM-based
devicemapper thin pools.

Fix an issue where cadvisor would not report any stats for a container if it failed to get the
filesystem stats when Docker's storage driver is devicemapper.

vendor/github.com/google/cadvisor/utils/docker/docker.go

@@ -16,6 +16,7 @@ package docker
 
 import (
 	"fmt"
+	"os"
 	"strings"
 
 	dockertypes "github.com/docker/engine-api/types"
@@ -50,8 +51,19 @@ func DockerThinPoolName(info dockertypes.Info) (string, error) {
 
 func DockerMetadataDevice(info dockertypes.Info) (string, error) {
 	metadataDevice := DriverStatusValue(info.DriverStatus, DriverStatusMetadataFile)
-	if len(metadataDevice) == 0 {
-		return "", fmt.Errorf("Could not get the devicemapper metadata device")
+	if len(metadataDevice) != 0 {
+		return metadataDevice, nil
+	}
+
+	poolName, err := DockerThinPoolName(info)
+	if err != nil {
+		return "", err
+	}
+
+	metadataDevice = fmt.Sprintf("/dev/mapper/%s_tmeta", poolName)
+
+	if _, err := os.Stat(metadataDevice); err != nil {
+		return "", err
 	}
 
 	return metadataDevice, nil