> ## Documentation Index
> Fetch the complete documentation index at: https://arizeai-433a7140.mintlify.site/llms.txt
> Use this file 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>