---
title: Beat fields
description: Contains common beat fields available in all event types. 
url: https://www.elastic.co/docs/reference/beats/heartbeat/exported-fields-beat-common
products:
  - Beats
  - Heartbeat
applies_to:
  - Elastic Stack: Generally available
---

# Beat fields
Contains common beat fields available in all event types.
<definitions>
  <definition term="agent.hostname">
    Deprecated - use agent.name or agent.id to identify an agent.
    type: alias
    alias to: agent.name
  </definition>
  <definition term="beat.timezone">
    type: alias
    alias to: event.timezone
  </definition>
  <definition term="fields">
    Contains user configurable fields.
    type: object
  </definition>
  <definition term="beat.name">
    type: alias
    alias to: host.name
  </definition>
  <definition term="beat.hostname">
    type: alias
    alias to: agent.name
  </definition>
  <definition term="timeseries.instance">
    Time series instance id
    type: keyword
  </definition>
</definitions>