> For the complete documentation index, see [llms.txt](https://docs.nexthink.com/platform/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.nexthink.com/platform/~/changes/Sh4xqs4GDClkDKT9Hvux/references/references-classic/glossary-classic/alert-classic.md).

# Alert (classic)

Alerts warn you of particular situations in your IT infrastructure. An alert usually indicates the occurrence of an issue that needs to be addressed. The idea behind alerts is that you do not need to look constantly for problematic cases in the system, but it is the system that can detect them and notify you when they happen. There are two types of alerts:

Investigation-based alerts

Triggered by conditions that you can specify in the Finder using investigations.

Service-based alerts

Triggered by warning or error conditions on the real-time services that you add to your Portal.

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RELATED TASKS

* [Receiving alerts](/platform/~/changes/Sh4xqs4GDClkDKT9Hvux/user-guide/alerts-and-diagnostics/alerts-classic/receiving-alerts-classic.md)
* [Creating a service-based alert](/platform/~/changes/Sh4xqs4GDClkDKT9Hvux/user-guide/alerts-and-diagnostics/alerts-classic/creating-a-service-based-alert-classic.md)
* [Creating an investigation-based alert](/platform/~/changes/Sh4xqs4GDClkDKT9Hvux/user-guide/alerts-and-diagnostics/alerts-classic/creating-a-service-based-alert-classic.md)


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