Merge pull request #1634 from basvdlei/prometheus-ignore-unused-cpu

Ignore unused cpus in Prometheus metrics

metrics/prometheus.go

@@ -130,11 +130,13 @@ func NewPrometheusCollector(i infoProvider, f ContainerLabelsFunc) *PrometheusCo
 				getValues: func(s *info.ContainerStats) metricValues {
 					values := make(metricValues, 0, len(s.Cpu.Usage.PerCpu))
 					for i, value := range s.Cpu.Usage.PerCpu {
+						if value > 0 {
 							values = append(values, metricValue{
 								value:  float64(value) / float64(time.Second),
 								labels: []string{fmt.Sprintf("cpu%02d", i)},
 							})
 						}
+					}
 					return values
 				},
 			}, {