采集网络接口的时候，会出现内存泄漏

shangmin-001 · shangmin-001 · commit 178d6e0dd5c9 · 2021-05-26T10:47:20.000+08:00
diff --git a/metric/system/net.go b/metric/system/net.go
@@ -217,6 +217,9 @@ func (s *NetIOStats) Collect() (datas []map[string]interface{}, err error) {
 
 func (s *NetIOStats) initInterfaces() {
 	if interfaces, err := net.Interfaces(); err == nil {
+		if len(s.InterfacesMap) > 0 {
+			s.InterfacesMap = make(map[string]net.Interface)
+		}
 		for _, _interface := range interfaces {
 			s.InterfacesMap[_interface.Name] = _interface
 		}

Original file line number	Diff line number	Diff line change
`@@ -217,6 +217,9 @@ func (s *NetIOStats) Collect() (datas []map[string]interface{}, err error) {`
`217`	`217`
`218`	`218`	`func (s *NetIOStats) initInterfaces() {`
`219`	`219`	`if interfaces, err := net.Interfaces(); err == nil {`
	`220`	`+ if len(s.InterfacesMap) > 0 {`
	`221`	`+ s.InterfacesMap = make(map[string]net.Interface)`
	`222`	`+ }`
`220`	`223`	`for _, _interface := range interfaces {`
`221`	`224`	`s.InterfacesMap[_interface.Name] = _interface`
`222`	`225`	`}`