feat: add metrics (#3624)

core/stores/redis/redisclientmanager.go

@@ -3,6 +3,7 @@ package redis
 import (
 	"crypto/tls"
 	"io"
+	"runtime"
 
 	red "github.com/go-redis/redis/v8"
 	"github.com/zeromicro/go-zero/core/syncx"
@@ -14,7 +15,11 @@ const (
 	idleConns       = 8
 )
 
-var clientManager = syncx.NewResourceManager()
+var (
+	clientManager = syncx.NewResourceManager()
+	// nodePoolSize is default pool size for node type of redis.
+	nodePoolSize = 10 * runtime.GOMAXPROCS(0)
+)
 
 func getClient(r *Redis) (*red.Client, error) {
 	val, err := clientManager.GetResource(r.Addr, func() (io.Closer, error) {
@@ -37,6 +42,15 @@ func getClient(r *Redis) (*red.Client, error) {
 			store.AddHook(hook)
 		}
 
+		connCollector.registerClient(&statGetter{
+			clientType: NodeType,
+			key:        r.Addr,
+			poolSize:   nodePoolSize,
+			poolStats: func() *red.PoolStats {
+				return store.PoolStats()
+			},
+		})
+
 		return store, nil
 	})
 	if err != nil {