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

# Add Hostname Processor

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# Important note for users on the following Datadog sites: app.ddog-gov.com

{% alert level="danger" %}
This product is not supported for your selected [Datadog site](https://docs.datadoghq.com/getting_started/site). ().
{% /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**. Only logs that match the specified filter query are processed. All logs, regardless of whether they do or do not match the filter query, are sent to the next step in the pipeline. See [Search Syntax](https://docs.datadoghq.com/observability_pipelines/search_syntax/logs/) for more information.