Add more metrics collection

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

supervisor/metrics.go

@@ -0,0 +1,27 @@
+package supervisor
+
+import "github.com/rcrowley/go-metrics"
+
+var (
+	ContainerCreateTimer   = metrics.NewTimer()
+	ContainerDeleteTimer   = metrics.NewTimer()
+	ContainerStartTimer    = metrics.NewTimer()
+	ContainersCounter      = metrics.NewCounter()
+	EventSubscriberCounter = metrics.NewCounter()
+	EventsCounter          = metrics.NewCounter()
+	ExecProcessTimer       = metrics.NewTimer()
+	ExitProcessTimer       = metrics.NewTimer()
+)
+
+func Metrics() map[string]interface{} {
+	return map[string]interface{}{
+		"container-create-time": ContainerCreateTimer,
+		"container-delete-time": ContainerDeleteTimer,
+		"container-start-time":  ContainerStartTimer,
+		"containers":            ContainersCounter,
+		"event-subscribers":     EventSubscriberCounter,
+		"events":                EventsCounter,
+		"exec-process-time":     ExecProcessTimer,
+		"exit-process-time":     ExitProcessTimer,
+	}
+}