> For the complete documentation index, see [llms.txt](https://docs.auterion.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.auterion.com/app-development/app-framework/logging.md).

# Log App Data to Auterion Suite

AuterionOS can log app data from various sources into a centralized flight log in the ULog format. Any data that is added to the flight log will eventually be uploaded to Auterion Suite.

The best way to implement custom logging is using ROS 2 messages:

{% content-ref url="/pages/EATxIYIAVzv7LkFzakhx" %}
[How to log Time Series Data](/app-development/app-framework/logging/logging-ros2-messages.md)
{% endcontent-ref %}

Alternatively, the standard output can be used to add basic text messages as strings to the flight log:

{% content-ref url="/pages/JoPdFdl7uM7bHZbqbitT" %}
[How to log basic Text Output](/app-development/app-framework/logging/logging-text-output.md)
{% endcontent-ref %}