# Gateway Connection Lifecycle Management

## Module
Gateway

## Status
IMPLEMENTED

## Description
HELLO frame processing for microservice registration, connection lifecycle management with cleanup on disconnect, and `ConnectionManager` hosted service for monitoring active connections.

## Implementation Details
- **Gateway hosted service**: `src/Gateway/StellaOps.Gateway.WebService/Services/GatewayHostedService.cs` -- connection lifecycle management background service
- **Health monitoring**: `src/Gateway/StellaOps.Gateway.WebService/Services/GatewayHealthMonitorService.cs` -- monitors active connections, detects stale instances
- **Metrics**: `src/Gateway/StellaOps.Gateway.WebService/Services/GatewayMetrics.cs` -- connection metrics tracking
- **Configuration**: `src/Gateway/StellaOps.Gateway.WebService/Configuration/GatewayOptions.cs`, `GatewayOptionsValidator.cs`
- **Source**: batch_51/file_22.md

## E2E Test Plan
- [ ] Verify HELLO frame processing registers new microservice connections
- [ ] Test connection cleanup on client disconnect
- [ ] Verify GatewayHealthMonitorService detects stale connections
- [ ] Verify edge cases and error handling