# Frequently asked questions

Find CPU alerting advice, Prometheus rule imports, subscriptions and data troubleshooting.

Last reviewed 2026-10-11

Continue from this former catalogue to the current guides and the practical articles that retain their original URLs.

## Browse by topic[​](#topics "Direct link to Browse by topic")

* [Should high CPU trigger an alert?](https://n9e.io/docs/faq/cpu-alerting.md)
* [Import Prometheus rules](https://n9e.io/docs/alerting/import-export.md)
* [Subscribe across groups](https://n9e.io/docs/events/subscriptions.md)
* [Replace global callbacks](https://n9e.io/docs/events/subscriptions.md)
* [Connected datasource with no data](https://n9e.io/docs/troubleshooting/no-data.md)
* [Events without notifications](https://n9e.io/docs/troubleshooting/no-notification.md)

## Next[​](#next "Direct link to Next")

* [Documentation home](https://n9e.io/docs.md)
* [System architecture](https://n9e.io/docs/concepts/architecture.md)