---
title: Add Hostname Processor
description: Datadog, the leading service for cloud-scale monitoring.
breadcrumbs: Docs > Observability Pipelines > Processors > Add Hostname Processor
---

> For the complete documentation index, see [llms.txt](https://docs.datadoghq.com/llms.txt).

# Add Hostname Processor

{% callout %}
# Important note for users on the following Datadog sites: app.ddog-gov.com, us2.ddog-gov.com

{% alert level="danger" %}
This product is not supported for your selected [Datadog site](https://docs.datadoghq.com/getting_started/site.md). ({% placeholder "user-datadog-site-name" /%}).
{% /alert %}

{% /callout %}
Available for:
{% icon name="icon-logs" /%}
 Logs 
## Overview{% #overview %}

This processor adds a field with the name of the host that sent the log. For example, `hostname: 613e197f3526`. **Note**: If the `hostname` already exists, the Worker throws an error and does not overwrite the existing `hostname`.

## Setup{% #setup %}

To set up this processor:

- Define a filter query. See [Logs Search Syntax](https://docs.datadoghq.com/observability_pipelines/search_syntax/logs.md) for more information.
  - Only logs that match the specified filter query are processed.
  - All logs, regardless of whether they match the filter query, are sent to the next step in the pipeline.