---
title: Measurements (Transactions) fields
description: These fields contain measurements related to the transaction. 
url: https://www.elastic.co/elastic/docs-builder/docs/3016/reference/beats/packetbeat/exported-fields-trans_measurements
products:
  - Beats
  - Packetbeat
applies_to:
  - Elastic Cloud Serverless: Generally available
  - Elastic Stack: Generally available
---

# Measurements (Transactions) fields
These fields contain measurements related to the transaction.
<definitions>
  <definition term="bytes_in">
    The number of bytes of the request. Note that this size is the application layer message length, without the length of the IP or TCP headers.
    type: alias
    alias to: source.bytes
  </definition>
  <definition term="bytes_out">
    The number of bytes of the response. Note that this size is the application layer message length, without the length of the IP or TCP headers.
    type: alias
    alias to: destination.bytes
  </definition>
</definitions>