add stats debug interface

debug/stats/stats.go

@@ -0,0 +1,24 @@
+// Package stats provides runtime stats
+package stats
+
+// Stats provides stats interface
+type Stats interface {
+	// Read a stat snapshot
+	Read() (*Stat, error)
+	// Write a stat snapshot
+	Write(*Stat) error
+}
+
+// A runtime stat
+type Stat struct {
+	// Start time as unix timestamp
+	Started int64
+	// Uptime in nanoseconds
+	Uptime int64
+	// Memory usage in bytes
+	Memory uint64
+	// Threads aka go routines
+	Threads uint64
+	// Garbage collection in nanoseconds
+	GC uint64
+}