# Event messages

{% hint style="info" %}
This page was generated from content adapted from the [AWS Developer Guide](https://github.com/awsdocs/aws-iot-docs.git)
{% endhint %}

## Lifecycle events

* **Note**\
  Lifecycle messages might be sent out of order. You might receive duplicate messages.
* **Note**\
  With AWS IoT Device Management fleet indexing, you can search for things, run aggregate queries, and create dynamic groups based on thing Connect/Disconnect events. For more information, see [Fleet indexing](https://docs.aws.amazon.com/iot/latest/developerguide/iot-indexing.html).
* **Note**\
  Lifecycle messages might be sent out of order. You might receive duplicate messages.


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://awsnotes.dendron.so/internet-of-things-iot/aws-iot-device-defender/topics/event-messages.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.