---
title: "Event Types"
slug: "event-types"
tags: ["5.5"]
updated: 2026-10-27T23:00:54Z
published: 2026-10-27T23:00:54Z
canonical: "docs.vastdata.com/event-types"
---

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

# Event Types

Different types of events can be defined to trigger alarms in different ways. The main types of events are:

- *Object Modified*. With this type of event, an alarm is triggered on and off when an object property reaches specified values.

Examples:

  - An alarm is triggered on when the cluster state is failing or failed, and then triggered off when the cluster state is active again.
  - An alarm is triggered on when the *attached* property of an SSD turns false, and triggered off when it changes to true.
- *Threshold*. These events trigger alarms when a property value crosses a specified threshold.

Examples (default):

  - An alarm is triggered when NVRAM has 100 or more disk media errors.
  - An alarm is triggered when cluster capacity is greater than or equal to 90 %.
- *Rate*. These events trigger alarms if a property value exceeds a threshold within a given time frame.

Examples (default):

  - An alarm is triggered when CNode memory is raised by more than 10% in 24 hours.
  - An alarm is triggered when a CNode has over 100 PCI errors in a 12 hour period.