From 05b35159b2bd112f67a0b1ea36dbf5f8d2f3d597 Mon Sep 17 00:00:00 2001
From: zhx <zhx@haiyi.com>
Date: Sat, 23 May 2026 13:00:15 +0800
Subject: [PATCH] fix: clamp dashboard cdc position gap

---
 internal/monitor/metrics.go | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/internal/monitor/metrics.go b/internal/monitor/metrics.go
index 355fe42..4ba77a2 100644
--- a/internal/monitor/metrics.go
+++ b/internal/monitor/metrics.go
@@ -138,9 +138,12 @@ func positionMap(pos mysql.Position) map[string]interface{} {
 }
 
 func positionGap(master mysql.Position, checkpoint mysql.Position) interface{} {
-	if master.Name == "" || checkpoint.Name == "" || master.Name != checkpoint.Name || master.Pos < checkpoint.Pos {
+	if master.Name == "" || checkpoint.Name == "" || master.Name != checkpoint.Name {
 		return nil
 	}
+	if master.Pos < checkpoint.Pos {
+		return uint32(0)
+	}
 	return master.Pos - checkpoint.Pos
 }