Merge pull request #2010 from ProjectMutilation/fix-handle-leak

fix(registry): prevent file descriptor leak in WriteToTextfile

Author: kakkoyun

prometheus/registry.go

@@ -641,10 +641,12 @@ func WriteToTextfile(filename string, g Gatherer) error {
 
 	mfs, err := g.Gather()
 	if err != nil {
+		tmp.Close()
 		return err
 	}
 	for _, mf := range mfs {
 		if _, err := expfmt.MetricFamilyToText(tmp, mf); err != nil {
+			tmp.Close()
 			return err
 		}
 	}