fix: 接线 Prometheus 指标到连接与投递事件

cmd/nixmsg/uplink.go

@@ -11,6 +11,7 @@ import (
 	"git.asio.asia/nixevol/NixMsg/internal/app/message"
 	"git.asio.asia/nixevol/NixMsg/internal/app/port"
 	"git.asio.asia/nixevol/NixMsg/internal/app/presence"
+	"git.asio.asia/nixevol/NixMsg/internal/metrics"
 	"git.asio.asia/nixevol/NixMsg/internal/protocol"
 )
 
@@ -23,6 +24,7 @@ type appUplink struct {
 	conns    *message.MemoryConns
 	down     port.Downlink
 	log      *slog.Logger
+	metrics  *metrics.Registry
 }
 
 func (u *appUplink) OnSessionEstablished(ctx context.Context, conn port.ConnInfo) error {
@@ -255,6 +257,9 @@ func (u *appUplink) replyErr(ctx context.Context, conn port.ConnInfo, rid, code,
 	if rid == "" {
 		rid = "0"
 	}
+	if u.metrics != nil && code != "" {
+		u.metrics.ErrorsTotal.WithLabelValues(code).Inc()
+	}
 	resp := protocol.Resp{
 		V:     protocol.Version,
 		Type:  protocol.TypeResp,