> ## Documentation index
> Fetch the complete documentation index at: https://arize.com/llms.txt
> Ask it with GET https://arize.com/ask?q=<keywords or question>. Short keywords rank best.
> Use these to discover all available pages before exploring further.

# Add metadata

> Tracing can be augmented and customized by adding Metadata. Metadata includes your own custom attributes, user ids, session ids, prompt templates, and more.

<Columns cols={2}>
<Card title="Add Attributes, Metadata, Users" href="/docs/phoenix/tracing/how-to-tracing/add-metadata/customize-spans" icon="tags" horizontal>
Learn how to add custom metadata and attributes to your traces
</Card>
<Card title="Instrument Prompt Templates and Prompt Variables" href="/docs/phoenix/tracing/how-to-tracing/add-metadata/instrumenting-prompt-templates-and-prompt-variables" icon="file-code" horizontal>
Learn how to define custom prompt templates and variables in your tracing.
</Card>
</Columns>