---
title: "constants | Grafana Alloy documentation"
description: "Learn about constants"
---

# constants

The `constants` object exposes a list of constant values about the system Alloy is running on:

- `constants.hostname`: The hostname of the machine Alloy is running on.
- `constants.os`: The operating system Alloy is running on.
- `constants.arch`: The architecture of the system Alloy is running on.
- `constants.version` : The version of the Alloy instance if the binary was built with the version information, otherwise it’s an empty string.

## Examples

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```alloy
> constants.hostname
"my-hostname"

> constants.os
"linux"

> constants.arch
"amd64"
```