> For the complete documentation index, see [llms.txt](https://docs.console.zenlayer.com/welcome/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.console.zenlayer.com/welcome/elastic-compute/instance-monitoring/06-liveness.md).

# Is the Instance Alive?

## Uptime — Running for

How long the guest has been running since its last boot. Use this to confirm whether an instance has rebooted recently.

The Uptime panel also shows whether the QEMU Guest Agent (QGA) is installed and data collection is enabled. Without QGA, the in-guest panels on this dashboard (CPU, memory, swap, load average, TCP connections, filesystem usage) will be empty — install QGA and enable data collection to populate them.

## TCP Connections

The count of established TCP sockets inside the guest. The cheapest possible "is this server actually serving anyone" signal, and an early warning for connection-leak bugs in long-running services.

## API Reference

| Console Panel        | API                         | metricType        | Notes        |
| -------------------- | --------------------------- | ----------------- | ------------ |
| Uptime — Running for | —                           | —                 | Console only |
| TCP Connections      | DescribeInstanceMonitorData | `TCP_ESTABLISHED` |              |