fix: reduce reconnect redeploy and metrics load (#476)

* fix: reduce reconnect redeploy and metrics load

Throttle node-online redeploy retries and lower the agent metric cadence so brief reconnect churn no longer fans out into repeated runtime syncs and backend connection pressure.

* docs: add follow-up implementation design notes

Document the planned flow upload batching work and the local remote-address toggle so the next changesets can implement them against an agreed design.

go-gost/x/socket/websocket_reporter.go

@@ -145,11 +145,12 @@ type ServiceMonitorCheckResult struct {
 }
 
 const (
-	reporterReadWait  = 60 * time.Second
-	reporterWriteWait = 5 * time.Second
-	wsPingInterval    = 20 * time.Second // 独立 WebSocket ping 间隔
-	initialBackoff    = 2 * time.Second  // 重连初始退避
-	maxBackoff        = 2 * time.Minute  // 重连最大退避
+	reporterReadWait            = 60 * time.Second
+	reporterWriteWait           = 5 * time.Second
+	wsPingInterval              = 20 * time.Second // 独立 WebSocket ping 间隔
+	initialBackoff              = 2 * time.Second  // 重连初始退避
+	maxBackoff                  = 2 * time.Minute  // 重连最大退避
+	defaultMetricReportInterval = 5 * time.Second
 )
 
 type WebSocketReporter struct {
@@ -189,9 +190,9 @@ func NewWebSocketReporter(serverURL string, secret string) *WebSocketReporter {
 
 	return &WebSocketReporter{
 		url:            serverURL,
-		curBackoff:     initialBackoff,   // 当前退避间隔
-		pingInterval:   1 * time.Second,  // 指标上报间隔（每秒采集）
-		configInterval: 10 * time.Minute, // 配置上报间隔
+		curBackoff:     initialBackoff,              // 当前退避间隔
+		pingInterval:   defaultMetricReportInterval, // 指标上报间隔
+		configInterval: 10 * time.Minute,            // 配置上报间隔
 		ctx:            ctx,
 		cancel:         cancel,
 		connected:      false,

go-gost/x/socket/websocket_reporter_test.go

@@ -110,6 +110,14 @@ func TestSanitizeWebSocketURL(t *testing.T) {
 	}
 }
 
+func TestNewWebSocketReporterUsesReducedMetricInterval(t *testing.T) {
+	reporter := NewWebSocketReporter("panel.example.com:443", "abc")
+
+	if reporter.pingInterval != defaultMetricReportInterval {
+		t.Fatalf("expected metric interval %s, got %s", defaultMetricReportInterval, reporter.pingInterval)
+	}
+}
+
 func TestFormatWebSocketDialErrorIncludesHTTPStatus(t *testing.T) {
 	err := errors.New("websocket: bad handshake")
 	resp := &http.Response{