A read-only status string reporting network buffer utilization on the Contivity, expressed as Warning above 75% usage or Alert above 87.5% usage. Exhausted network buffers on a VPN gateway lead to packet drops and tunnel instability under load, so this is an early-warning indicator of the box running out of headroom during traffic spikes. An admin seeing netBuffers report "Alert: Buffer Usage: Utilization exceeds 87.5%" during a peak business hour would treat it as a signal to investigate traffic volume or consider a hardware upgrade before users notice dropped connections.