Update cadvisor dependency

vendor/github.com/google/cadvisor/info/v2/container.go

@@ -216,6 +216,9 @@ type FsInfo struct {
 
 	// Labels associated with this filesystem.
 	Labels []string `json:"labels"`
+
+	// Number of available Inodes.
+	InodesFree uint64 `json:"inodes_free"`
 }
 
 type RequestOptions struct {

vendor/github.com/google/cadvisor/manager/manager.go

@@ -232,12 +232,12 @@ type manager struct {
 func (self *manager) Start() error {
 	err := docker.Register(self, self.fsInfo, self.ignoreMetrics)
 	if err != nil {
-		glog.Errorf("Docker container factory registration failed: %v.", err)
+		glog.Warningf("Docker container factory registration failed: %v.", err)
 	}
 
 	err = rkt.Register(self, self.fsInfo, self.ignoreMetrics)
 	if err != nil {
-		glog.Errorf("Registration of the rkt container factory failed: %v", err)
+		glog.Warningf("Registration of the rkt container factory failed: %v", err)
 	} else {
 		watcher, err := rktwatcher.NewRktContainerWatcher()
 		if err != nil {
@@ -248,7 +248,7 @@ func (self *manager) Start() error {
 
 	err = systemd.Register(self, self.fsInfo, self.ignoreMetrics)
 	if err != nil {
-		glog.Errorf("Registration of the systemd container factory failed: %v", err)
+		glog.Warningf("Registration of the systemd container factory failed: %v", err)
 	}
 
 	err = raw.Register(self, self.fsInfo, self.ignoreMetrics)
@@ -687,6 +687,7 @@ func (self *manager) GetFsInfo(label string) ([]v2.FsInfo, error) {
 			Usage:      fs.Usage,
 			Available:  fs.Available,
 			Labels:     labels,
+			InodesFree: fs.InodesFree,
 		}
 		fsInfo = append(fsInfo, fi)
 	}

vendor/github.com/google/cadvisor/version/VERSION

@@ -1 +1 @@
-0.23.4
+0.23.6