Record delay test history in proxy info (Clash API standard compliance)

api.go

@@ -86,7 +86,7 @@ func (b *Box) buildProxyInfo(tag, outType string, group proxyGroup) map[string]a
 		"type":    capitalizeType(outType),
 		"alive":   true,
 		"udp":     true,
-		"history": []map[string]any{},
+		"history": b.getHistory(tag),
 	}
 	if group != nil {
 		info["now"] = group.Now()
@@ -394,13 +394,15 @@ func (b *Box) handleProxyDelay(w http.ResponseWriter, r *http.Request, name stri
 
 	delay, err := testProxyDelay(out, testURL, time.Duration(timeoutMs)*time.Millisecond)
 	if err != nil {
+		b.recordDelay(name, 0)
 		writeJSON(w, map[string]any{
-			"name":  name,
-			"delay": 0,
+			"name":    name,
+			"delay":   0,
 			"message": err.Error(),
 		})
 		return
 	}
+	b.recordDelay(name, delay)
 	writeJSON(w, map[string]any{
 		"name":  name,
 		"delay": delay,

box.go

@@ -5,6 +5,7 @@ import (
 	"fmt"
 	"net"
 	"strings"
+	"sync"
 	"time"
 
 	minidns "github.com/netkits-dev/mini-dns"
@@ -24,6 +25,12 @@ import (
 	N "github.com/sagernet/sing/common/network"
 )
 
+// DelayEntry records a single delay test result.
+type DelayEntry struct {
+	Time  time.Time `json:"time"`
+	Delay int       `json:"delay"`
+}
+
 type Box struct {
 	createdAt  time.Time
 	logFactory log.Factory
@@ -37,6 +44,39 @@ type Box struct {
 	apiLn      net.Listener
 	clashMode  string
 	modeList   []string
+
+	delayHistory   map[string][]DelayEntry // outbound tag -> recent delay results
+	delayHistoryMu sync.RWMutex
+}
+
+const maxDelayHistory = 10
+
+func (b *Box) recordDelay(tag string, delay int) {
+	b.delayHistoryMu.Lock()
+	defer b.delayHistoryMu.Unlock()
+	if b.delayHistory == nil {
+		b.delayHistory = make(map[string][]DelayEntry)
+	}
+	h := b.delayHistory[tag]
+	h = append(h, DelayEntry{Time: time.Now(), Delay: delay})
+	if len(h) > maxDelayHistory {
+		h = h[len(h)-maxDelayHistory:]
+	}
+	b.delayHistory[tag] = h
+}
+
+func (b *Box) getHistory(tag string) []map[string]any {
+	b.delayHistoryMu.RLock()
+	defer b.delayHistoryMu.RUnlock()
+	entries := b.delayHistory[tag]
+	result := make([]map[string]any, len(entries))
+	for i, e := range entries {
+		result[i] = map[string]any{
+			"time":  e.Time.Format(time.RFC3339),
+			"delay": e.Delay,
+		}
+	}
+	return result
 }
 
 func NewBox(ctx context.Context, options option.Options) (*Box, error) {