feat: 完善服务监控与下游重投

gateway/internal/upstream/manager.go

@@ -146,6 +146,21 @@ func (m *Manager) ensureDefaultsLocked() {
 	}
 }
 
+// ConnectionCounts returns bounded platform totals without channel identifiers to prevent time-series cardinality growth.
+func (m *Manager) ConnectionCounts() (desired int, connected int) {
+	m.mu.Lock()
+	pools := make([]*connectionPool, 0, len(m.conns))
+	for _, pool := range m.conns {
+		pools = append(pools, pool)
+	}
+	m.mu.Unlock()
+	for _, pool := range pools {
+		desired += max(pool.config.DesiredConnections, 1)
+		connected += pool.countActiveConnections()
+	}
+	return desired, connected
+}
+
 func (m *Manager) newConnectionPool(channelID string, connectionID string, config queue.UpstreamConfig) *connectionPool {
 	return &connectionPool{
 		channelID:    channelID,