Separate open and closed issue in metrics (#16637)

* Get the issue counts in one query

Signed-off-by: Andrew Thornton <art27@cantab.net>

Co-authored-by: Andrew Thornton <art27@cantab.net>

models/models.go

@@ -272,7 +272,8 @@ type Statistic struct {
 	Counter struct {
 		User, Org, PublicKey,
 		Repo, Watch, Star, Action, Access,
-		Issue, Comment, Oauth, Follow,
+		Issue, IssueClosed, IssueOpen,
+		Comment, Oauth, Follow,
 		Mirror, Release, LoginSource, Webhook,
 		Milestone, Label, HookTask,
 		Team, UpdateTask, Attachment int64
@@ -289,7 +290,24 @@ func GetStatistic() (stats Statistic) {
 	stats.Counter.Star, _ = x.Count(new(Star))
 	stats.Counter.Action, _ = x.Count(new(Action))
 	stats.Counter.Access, _ = x.Count(new(Access))
-	stats.Counter.Issue, _ = x.Count(new(Issue))
+
+	type IssueCount struct {
+		Count    int64
+		IsClosed bool
+	}
+	issueCounts := []IssueCount{}
+
+	_ = x.Select("COUNT(*) AS count, is_closed").Table("issue").GroupBy("is_closed").Find(&issueCounts)
+	for _, c := range issueCounts {
+		if c.IsClosed {
+			stats.Counter.IssueClosed = c.Count
+		} else {
+			stats.Counter.IssueOpen = c.Count
+		}
+	}
+
+	stats.Counter.Issue = stats.Counter.IssueClosed + stats.Counter.IssueOpen
+
 	stats.Counter.Comment, _ = x.Count(new(Comment))
 	stats.Counter.Oauth = 0
 	stats.Counter.Follow, _ = x.Count(new(Follow))