fluent-bit-go-loki

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fluent-bit-go-loki

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[Deprecated] The predessor of fluent-bit output plugin for Loki. https://github.com/grafana/loki

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# fluent-bit loki output plugin

**NOTICE!**
**fluent-bit-go-loki is now merged in [loki repository](https://github.com/grafana/loki).**

[![Build Status](https://travis-ci.org/cosmo0920/fluent-bit-go-loki.svg?branch=master)](https://travis-ci.org/cosmo0920/fluent-bit-go-loki)
[![Build status](https://ci.appveyor.com/api/projects/status/6s9itaxvrkos11sx/branch/master?svg=true)](https://ci.appveyor.com/project/cosmo0920/fluent-bit-go-loki/branch/master)

Windows binaries are available in [release pages](https://github.com/cosmo0920/fluent-bit-go-loki/releases).

DockerHub base images is available in [DockerHub](https://hub.docker.com/r/cosmo0920/fluent-bit-go-loki).

This plugin works with fluent-bit's go plugin interface. You can use fluent-bit loki to ship logs into grafana datasource with loki.

The configuration typically looks like:

```graphviz
fluent-bit → loki → grafana ← other grafana sources
```

# Usage

```bash
$ fluent-bit -e /path/to/built/out_loki.so -c fluent-bit.conf
```

Or,

```bash
$ docker build . -t fluent-bit/loki-plugin
```

and then, specify Url parameter as environment variable:

```bash
$ docker run -it -e="LOKI_URL=http://[YOURHOST]:[YOURPORT]/loki/api/v1/push" fluent-bit/loki-plugin
```

Using docker image from docker hub.

```bash
$ docker pull cosmo0920/fluent-bit-go-loki:latest
```

Other released images are available in [DockerHub's fluent-bit-go-loki image tags](https://hub.docker.com/r/cosmo0920/fluent-bit-go-loki/tags).

# Prerequisites

* Go 1.11+
* gcc (for cgo)
* make (for Makefile)

## Building

```bash
$ make
```

### Configuration Options

| Key           | Description                                   | Default                             |
| --------------|-----------------------------------------------|-------------------------------------|
| Url           | Url of loki server API endpoint               | http://localhost:3100/loki/api/v1/push |
| BatchWait     | Time to wait before send a log batch to Loki, full or not. (unit: sec) | 1 second   |
| BatchSize     | Log batch size to send a log batch to Loki (unit: Bytes)    | 10 KiB (10*1024 Bytes)|
| Labels        | labels for API requests                       | job="fluent-bit" (describe below)   |
| LogLevel      | Specify log level                             | info                                |
| RemoveKeys    | Comma separated list of needless record keys to remove. | none                      |
| LabelKeys     | Comma separated list of keys to use as stream labels.   | none                      |

Example:

add this section to fluent-bit.conf

```properties
[Output]
    Name loki
    Match *
    Url http://localhost:3100/loki/api/v1/push
    BatchWait 10 # (10msec)
    BatchSize 30 # (30KiB)
    Labels {test="fluent-bit-go",lang="Golang"}
    RemoveKeys key1,key2
```

## Useful links

* [fluent-bit-go](https://github.com/fluent/fluent-bit-go)

fluent-bit-go-loki

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