fix(health): reset failed count after successful check (#5502)

Signed-off-by: racequite <quiterace@gmail.com>

README.md

@@ -12,6 +12,14 @@ frp is an open source project with its ongoing development made possible entirel
 
 <h3 align="center">Gold Sponsors</h3>
 <!--gold sponsors start-->
+<p align="center">
+  <a href="https://jb.gg/frp" target="_blank">
+    <img width="420px" src="https://raw.githubusercontent.com/fatedier/frp/dev/doc/pic/sponsor_jetbrains.jpg">
+	<br>
+	<b>The complete IDE crafted for professional Go developers</b>
+  </a>
+</p>
+
 <p align="center">
   <a href="https://github.com/beclab/Olares" target="_blank">
     <img width="420px" src="https://raw.githubusercontent.com/fatedier/frp/dev/doc/pic/sponsor_olares.jpeg">
@@ -32,13 +40,6 @@ an API that records Zoom, Google Meet, Microsoft Teams, in-person meetings, and
 
 </div>
 
-<p align="center">
-  <a href="https://jb.gg/frp" target="_blank">
-    <img width="420px" src="https://raw.githubusercontent.com/fatedier/frp/dev/doc/pic/sponsor_jetbrains.jpg">
-	<br>
-	<b>The complete IDE crafted for professional Go developers</b>
-  </a>
-</p>
 <!--gold sponsors end-->
 
 ## What is frp?

README_zh.md

@@ -14,6 +14,14 @@ frp 是一个完全开源的项目，我们的开发工作完全依靠赞助者
 
 <h3 align="center">Gold Sponsors</h3>
 <!--gold sponsors start-->
+<p align="center">
+  <a href="https://jb.gg/frp" target="_blank">
+    <img width="420px" src="https://raw.githubusercontent.com/fatedier/frp/dev/doc/pic/sponsor_jetbrains.jpg">
+	<br>
+	<b>The complete IDE crafted for professional Go developers</b>
+  </a>
+</p>
+
 <p align="center">
   <a href="https://github.com/beclab/Olares" target="_blank">
     <img width="420px" src="https://raw.githubusercontent.com/fatedier/frp/dev/doc/pic/sponsor_olares.jpeg">
@@ -34,13 +42,6 @@ an API that records Zoom, Google Meet, Microsoft Teams, in-person meetings, and
 
 </div>
 
-<p align="center">
-  <a href="https://jb.gg/frp" target="_blank">
-    <img width="420px" src="https://raw.githubusercontent.com/fatedier/frp/dev/doc/pic/sponsor_jetbrains.jpg">
-	<br>
-	<b>The complete IDE crafted for professional Go developers</b>
-  </a>
-</p>
 <!--gold sponsors end-->
 
 ## 为什么使用 frp ？

Release.md

@@ -1,9 +1,3 @@
-## Features
-
-* UDP packet payloads for ordinary UDP proxies and SUDP now use a dedicated binary codec when frpc and frps successfully negotiate the capability under wire protocol v2, using a more compact wire representation. Wire protocol v1 remains JSON; wire protocol v2 falls back to JSON `UDPPacket` when the peer does not support or did not negotiate the capability.
-
 ## Fixes
 
-* Fixed a server panic and remote denial of service caused by a client sending a negative `pool_count`. Negative values are now rejected before work-connection pool resources are allocated.
+* Fixed VirtualNet route lifecycle issues during reconnect and shutdown, including stale route cleanup, shutdown races, and reconnect backoff overflow.
-* Fixed `frpc verify` ignoring configured `featureGates`, which caused VirtualNet configurations to be rejected even when the feature was enabled.
-* Fixed a case-insensitive validation bypass that allowed `customDomains` under the configured `subDomainHost` to be registered using mixed-case domain names.

client/health/health.go

@@ -119,6 +119,7 @@ func (monitor *Monitor) checkWorker() {
 
 		if err == nil {
 			xl.Tracef("do one health check success")
+			monitor.failedTimes = 0
 			if !monitor.statusOK && monitor.statusNormalFn != nil {
 				xl.Infof("health check status change to success")
 				monitor.statusOK = true

client/health/health_test.go

@@ -0,0 +1,65 @@
+// Copyright 2026 The frp Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package health
+
+import (
+	"context"
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"sync/atomic"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/require"
+
+	v1 "github.com/fatedier/frp/pkg/config/v1"
+)
+
+func TestMonitorResetsFailedTimesAfterSuccess(t *testing.T) {
+	var checkCount atomic.Int32
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
+		count := checkCount.Add(1)
+		if count == 1 || count == 2 || count == 4 {
+			w.WriteHeader(http.StatusServiceUnavailable)
+			return
+		}
+		w.WriteHeader(http.StatusOK)
+	}))
+	defer server.Close()
+
+	var failedCount atomic.Int32
+	monitor := NewMonitor(
+		context.Background(),
+		v1.HealthCheckConfig{
+			Type:            "http",
+			Path:            "/health",
+			TimeoutSeconds:  1,
+			IntervalSeconds: 1,
+			MaxFailed:       3,
+		},
+		strings.TrimPrefix(server.URL, "http://"),
+		func() {},
+		func() { failedCount.Add(1) },
+	)
+	monitor.interval = 10 * time.Millisecond
+	monitor.Start()
+	defer monitor.Stop()
+
+	require.Eventually(t, func() bool {
+		return checkCount.Load() >= 5
+	}, time.Second, 10*time.Millisecond)
+	require.Equal(t, int32(0), failedCount.Load())
+}