add failcnt

container/libcontainer/helpers.go

@@ -348,6 +348,7 @@ func toContainerStats1(s *cgroups.Stats, ret *info.ContainerStats) {
 
 func toContainerStats2(s *cgroups.Stats, ret *info.ContainerStats) {
 	ret.Memory.Usage = s.MemoryStats.Usage
+	ret.Memory.Failcnt = s.MemoryStats.Failcnt
 	if v, ok := s.MemoryStats.Stats["pgfault"]; ok {
 		ret.Memory.ContainerData.Pgfault = v
 		ret.Memory.HierarchicalData.Pgfault = v

info/v1/container.go

@@ -312,6 +312,8 @@ type MemoryStats struct {
 	// Units: Bytes.
 	WorkingSet uint64 `json:"working_set"`
 
+	Failcnt uint64 `json:"failcnt"`
+
 	ContainerData    MemoryStatsMemoryData `json:"container_data,omitempty"`
 	HierarchicalData MemoryStatsMemoryData `json:"hierarchical_data,omitempty"`
 }

metrics/prometheus.go

@@ -121,6 +121,13 @@ func NewPrometheusCollector(infoProvider infoProvider) *PrometheusCollector {
 					}
 					return values
 				},
+			}, {
+				name:      "container_memory_failcnt",
+				help:      "Number of memory usage hits limits",
+				valueType: prometheus.CounterValue,
+				getValues: func(s *info.ContainerStats) metricValues {
+					return metricValues{{value: float64(s.Memory.Failcnt)}}
+				},
 			}, {
 				name:      "container_memory_usage_bytes",
 				help:      "Current memory usage in bytes.",

metrics/testdata/prometheus_metrics

@@ -68,6 +68,9 @@ container_fs_writes_total{device="sda2",id="testcontainer",image="test",name="te
 # HELP container_last_seen Last time a container was seen by the exporter
 # TYPE container_last_seen gauge
 container_last_seen{id="testcontainer",image="test",name="testcontaineralias"} 1.426203694e+09
+# HELP container_memory_failcnt Number of memory usage hits limits
+# TYPE container_memory_failcnt counter
+container_memory_failcnt{id="testcontainer",image="test",name="testcontaineralias"} 0
 # HELP container_memory_failures_total Cumulative count of memory allocation failures.
 # TYPE container_memory_failures_total counter
 container_memory_failures_total{id="testcontainer",image="test",name="testcontaineralias",scope="container",type="pgfault"} 10