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Fluentd Input Plugin

The fluentd plugin gathers metrics from plugin endpoint provided by in_monitor plugin. This plugin understands data provided by /api/plugin.json resource (/api/config.json is not covered).

You might need to adjust your fluentd configuration, in order to reduce series cardinality in case your fluentd restarts frequently. Every time fluentd starts, plugin_id value is given a new random value. According to fluentd documentation, you are able to add @id parameter for each plugin to avoid this behaviour and define custom plugin_id.

example configuration with @id parameter for http plugin:

<source>
  @type http
  @id http
  port 8888
</source>

Configuration:

# Read metrics exposed by fluentd in_monitor plugin
[[inputs.fluentd]]
  ## This plugin reads information exposed by fluentd (using /api/plugins.json endpoint).
  ##
  ## Endpoint:
  ## - only one URI is allowed
  ## - https is not supported
  endpoint = "http://localhost:24220/api/plugins.json"

  ## Define which plugins have to be excluded (based on "type" field - e.g. monitor_agent)
  exclude = [
	  "monitor_agent",
	  "dummy",
  ]

Measurements & Fields:

Fields may vary depending on the plugin type

  • fluentd
    • retry_count (float, unit)
    • buffer_queue_length (float, unit)
    • buffer_total_queued_size (float, unit)

Tags:

  • All measurements have the following tags:
    • plugin_id (unique plugin id)
    • plugin_type (type of the plugin e.g. s3)
    • plugin_category (plugin category e.g. output)

Example Output:

$ telegraf --config fluentd.conf --input-filter fluentd --test
* Plugin: inputs.fluentd, Collection 1
> fluentd,host=T440s,plugin_id=object:9f748c,plugin_category=input,plugin_type=dummy buffer_total_queued_size=0,buffer_queue_length=0,retry_count=0 1492006105000000000
> fluentd,plugin_category=input,plugin_type=dummy,host=T440s,plugin_id=object:8da98c buffer_queue_length=0,retry_count=0,buffer_total_queued_size=0 1492006105000000000
> fluentd,plugin_id=object:820190,plugin_category=input,plugin_type=monitor_agent,host=T440s retry_count=0,buffer_total_queued_size=0,buffer_queue_length=0 1492006105000000000
> fluentd,plugin_id=object:c5e054,plugin_category=output,plugin_type=stdout,host=T440s buffer_queue_length=0,retry_count=0,buffer_total_queued_size=0 1492006105000000000
> fluentd,plugin_type=s3,host=T440s,plugin_id=object:bd7a90,plugin_category=output buffer_queue_length=0,retry_count=0,buffer_total_queued_size=0 1492006105000000000