Add pool instrumentation.

cluster.go

@@ -56,6 +56,22 @@ func (c *ClusterClient) Watch(keys ...string) (*Multi, error) {
 	return client.Watch(keys...)
 }
 
+// PoolStats returns accumulated connection pool stats
+func (c *ClusterClient) PoolStats() *PoolStats {
+	acc := PoolStats{}
+	c.clientsMx.RLock()
+	for _, client := range c.clients {
+		m := client.PoolStats()
+		acc.TotalConns += m.TotalConns
+		acc.FreeConns += m.FreeConns
+		acc.Requests += m.Requests
+		acc.Waits += m.Waits
+		acc.Timeouts += m.Timeouts
+	}
+	c.clientsMx.RUnlock()
+	return &acc
+}
+
 // Close closes the cluster client, releasing any open resources.
 //
 // It is rare to Close a ClusterClient, as the ClusterClient is meant
@@ -306,6 +322,7 @@ type ClusterOptions struct {
 	ReadTimeout  time.Duration
 	WriteTimeout time.Duration
 
+	// PoolSize applies per redis node and not for the whole cluster.
 	PoolSize    int
 	PoolTimeout time.Duration
 	IdleTimeout time.Duration