Add PoolStats.StaleConns and enable logging by default

redis.go

@@ -3,6 +3,7 @@ package redis
 import (
 	"fmt"
 	"log"
+	"os"
 	"time"
 
 	"github.com/go-redis/redis/internal"
@@ -13,6 +14,10 @@ import (
 // Redis nil reply, .e.g. when key does not exist.
 const Nil = internal.Nil
 
+func init() {
+	SetLogger(log.New(os.Stderr, "redis: ", log.LstdFlags|log.Lshortfile))
+}
+
 func SetLogger(logger *log.Logger) {
 	internal.Logger = logger
 }