> ## Documentation Index
> Fetch the complete documentation index at: https://docs.tensormesh.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Thresholds & Notifications

> Decide what counts as a problem, and get notified the moment it happens.

Thresholds turn live numbers into severity. Each metric on the Thresholds page has a
*degraded* (warn) and a *critical* band:

| Metric                         | Default warn / critical |
| ------------------------------ | ----------------------- |
| **L1 (host DRAM) cache fill**  | 78% / 90%               |
| **GPU memory fill**            | 96% / 99%               |
| **L2 (external) storage fill** | 70% / 85%               |
| **Pod restarts**               | 0 / 2                   |
| **Prefetch failures**          | 1 / 10 per second       |
| **Evictions**                  | 100 / 300 per second    |

Reset to Defaults restores these baselines. High GPU *compute* utilization is intentionally never
alarmed: busy GPUs are the goal, not a fault.

Thresholds drive three things: the severity colors across the dashboard, the Issues list on
Overview (each issue linking to the worst offender), and notifications.

***

## Scope

Set global defaults, then override per engine where needed. An engine inherits the global
band for anything it doesn't override, and each level has a one-click revert.

Thresholds, node nicknames, and the notification toggle are saved in your browser, not on the
cluster: the UI never writes to your cluster. They change what the dashboard flags, not how the
engine behaves.

***

## Notifications

The dashboard refreshes every 30 seconds. When an issue turns critical, you get a notification in
the dashboard, and optionally on your desktop (enable System alerts in the sidebar). Clicking it
takes you straight to the affected node.

Three rules keep notifications worth reading:

* Only new problems notify: opening the page doesn't re-announce ones that already existed.
* The same problem won't notify again for 5 minutes, so a metric bouncing in and out of critical
  doesn't spam you.
* Warning-level problems color the dashboard but never notify: only critical ones do.

***

## Related

* [Monitoring Your Fleet](/v1.0.0/ui/monitoring-your-fleet)
* [Troubleshooting & FAQ](/v1.0.0/ui/troubleshooting)