Auto-detects VPN type and reports status to InfluxDB via Telegraf exec:
- IKEv2/strongSwan: swanctl or ipsec* interface + RX bytes
- OpenVPN: process + tun0 interface
- GRE: gre1 interface + RX bytes changing
- OpenConnect: process + vpns/tun interface
- Xray: process + SOCKS port listening
- AmneziaWG/WireGuard: interface + recent handshake

Deployed to all 11 egw/ogw containers with Telegraf integration.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>