Move cgroups prom to containerd metrics

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

metrics/cgroups/hugetlb.go

@@ -0,0 +1,70 @@
+package cgroups
+
+import (
+	"github.com/containerd/cgroups"
+	metrics "github.com/docker/go-metrics"
+	"github.com/prometheus/client_golang/prometheus"
+)
+
+var hugetlbMetrics = []*metric{
+	{
+		name:   "hugetlb_usage",
+		help:   "The hugetlb usage",
+		unit:   metrics.Bytes,
+		vt:     prometheus.GaugeValue,
+		labels: []string{"page"},
+		getValues: func(stats *cgroups.Stats) []value {
+			if stats.Hugetlb == nil {
+				return nil
+			}
+			var out []value
+			for page, v := range stats.Hugetlb {
+				out = append(out, value{
+					v: float64(v.Usage),
+					l: []string{page},
+				})
+			}
+			return out
+		},
+	},
+	{
+		name:   "hugetlb_failcnt",
+		help:   "The hugetlb failcnt",
+		unit:   metrics.Total,
+		vt:     prometheus.GaugeValue,
+		labels: []string{"page"},
+		getValues: func(stats *cgroups.Stats) []value {
+			if stats.Hugetlb == nil {
+				return nil
+			}
+			var out []value
+			for page, v := range stats.Hugetlb {
+				out = append(out, value{
+					v: float64(v.Failcnt),
+					l: []string{page},
+				})
+			}
+			return out
+		},
+	},
+	{
+		name:   "hugetlb_max",
+		help:   "The hugetlb maximum usage",
+		unit:   metrics.Bytes,
+		vt:     prometheus.GaugeValue,
+		labels: []string{"page"},
+		getValues: func(stats *cgroups.Stats) []value {
+			if stats.Hugetlb == nil {
+				return nil
+			}
+			var out []value
+			for page, v := range stats.Hugetlb {
+				out = append(out, value{
+					v: float64(v.Max),
+					l: []string{page},
+				})
+			}
+			return out
+		},
+	},
+}