fluent-plugin-yohoushi

Fluentd plugin to post data to yohoushi where yohoushi is a visualization graph tool.

Configuration

<match foo.bar.**>
  type yohoushi
  base_uri http://yohoushi.local:4804
  key1 foo_count /foobar/foo_count
  key2 bar_count /foobar/bar_count
</source>

Assuming following inputs are coming:

foo.bar: {"foo_count":1,"bar_count":2}

then fluent-plugin-yohoushi posts data to yohoshi similarly like

$ curl -d number=1 http://yohoushi.local:4804/api/graphs/foobar/foo_count
$ curl -d number=2 http://yohoushi.local:4804/api/graphs/foobar/bar_count

Parameters

base_uri (semi-required)

The base uri of yohoushi. mapping1 or base_uri is required.
mapping[1-20] (semi-required)

This is an option for multiforecast-client. mapping1 or base_uri is required.

With this option, you can post graph data directly to multiple growthforecasts, not via yohoushi, which is more efficient.

ex)
```
mapping1 /foobar http://growthforecast1.local:5125
mapping2 /       http://growthforecast2.local:5125
```
key[1-20] (semi-required)

A pair of a field name of the input record, and a graph path to be posted. key1 or key_pattern is required.

SECRET TRICK: You can use placeholders for the graph path. See Placeholders section.
key_pattern (semi-requierd)

A pair of a regular expression to specify field names of the input record, and an expression to specify graph paths. key1 or key_pattern is required.

For example, a configuration like
```
key_pattern _count$ /foobar/${key}
```
instead of key1, key2 in the above example gives the same effect.
```
$ curl -d number=1 http://yohoushi.local:4804/api/graphs/foobar/foo_count
$ curl -d number=2 http://yohoushi.local:4804/api/graphs/foobar/bar_count
```
See Placeholders section to know more about placeholders such as $key.
enable_float_number

Set to true if you are enabling --enable_float_number option of GrowthForecast. Default is false
mode

The graph mode (either of gauge, count, modified, or derive). Just same as mode of GrowthForecast POST parameter. Default is gauge.
enable_ruby bool

Enable to use ruby codes in placeholders. See Placeholders section. Default is true (just for lower version compatibility).

Placeholders

The keys of input json are available as placeholders. In the above example,

$foo_count
$bar_count

shall be available. In addition, following placeholders are reserved:

$hostname hostname
$time time of the event
$key the matched key value with key_pattern or key1, key2, ...
$tag input tag
$tags[N] (Obsolete. Use tag_parts) Input tag splitted by '.'
$tag_parts[N] Input tag splitted by '.' indexed with N such as ${tag_parts[0]}, ${tag_parts[-1]}.

$tag_prefix[N] Tag parts before and on the index N. For example,

Input tag: prefix.test.tag.suffix

${tag_prefix[0]}  => prefix
${tag_prefix[1]}  => prefix.test
${tag_prefix[-2]} => prefix.test.tag
${tag_prefix[-1]} => prefix.test.tag.suffix

$tag_suffix[N] Tag parts after and on the index N. For example,

Input tag: prefix.test.tag.suffix

${tag_suffix[0]}  => prefix.test.tag.suffix
${tag_suffix[1]}  => test.tag.suffix
${tag_suffix[-2]} => tag.suffix
${tag_suffix[-1]} => suffix

It is also possible to write a ruby code in placeholders if you set enable_ruby true option, so you may write some codes as

$time.strftime('%Y-%m-%dT%H:%M:%S%z')
$tag_partstag_parts.last

but, please note that enabling ruby codes is not encouraged by security reasons and also in terms of the performance.

ChangeLog

See CHANGELOG.md for details.

Contributing