> For the complete documentation index, see [llms.txt](https://ciusji.gitbook.io/leona/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://ciusji.gitbook.io/leona/getting-in/log-sources/gelf.md).

# GELF

The **GuinsooLab Extended Log Format** (GELF) is a log format that avoids the shortcomings of classic plain `syslog`:

* Limited to length of 1024 bytes. Inadequate space for payloads like backtraces.
* No data types in structured syslog. Numbers and strings are indistinguishable.
* The RFCs are strict enough, but there are so many syslog dialects out there that you cannot possibly parse all of them.
* No compression.

## Sending GELF Messages Via UDP Using Netcat

Sending an example message to a GELF UDP input (running on the host `leona.example.com` on port 12201):

```bash
echo -n '{ "version": "1.1", "host": "example.org", "short_message": "A short message", "level": 5, "_some_info": "foo" }' | nc -w0 -u leona.example.com 12201
```

## Sending GELF Messages Via TCP Using Netcat

Sending an example message to a GELF TCP input (running on the host `leona.example.com` on port 12201):

```bash
echo -n '{ "version": "1.1", "host": "example.org", "short_message": "A short message", "level": 5, "_some_info": "foo" }' | nc -w0 -u leona.example.com 12201
```

## Sending GELF Messages Via Using Curl

Sending an example message to a GELF input (running on the host `leona.example.com` on port 12201):

```bash
curl -X POST -H 'Content-Type: application/json' -d '{ "version": "1.1", "host": "example.org", "short_message": "A short message", "level": 5, "_some_info": "foo" }' 'leona.example.com:12201/gelf'
```


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:

```
GET https://ciusji.gitbook.io/leona/getting-in/log-sources/gelf.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.