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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>

Global configuration options

In addition to the plugin-specific configuration settings, plugins support additional global and plugin configuration settings. These settings are used to modify metrics, tags, and field or create aliases and configure ordering, etc. See the CONFIGURATION.md for more details.

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",
  ]

Metrics

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)
    • rollback_count (float, unit)
    • flush_time_count (float, unit)
    • slow_flush_count (float, unit)
    • emit_count (float, unit)
    • emit_records (float, unit)
    • emit_size (float, unit)
    • write_count (float, unit)
    • buffer_stage_length (float, unit)
    • buffer_queue_byte_size (float, unit)
    • buffer_stage_byte_size (float, unit)
    • buffer_available_buffer_space_ratios (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

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
fluentd,plugin_id=output_td, plugin_category=output,plugin_type=tdlog, host=T440s buffer_available_buffer_space_ratios=100,buffer_queue_byte_size=0,buffer_queue_length=0,buffer_stage_byte_size=0,buffer_stage_length=0,buffer_total_queued_size=0,emit_count=0,emit_records=0,flush_time_count=0,retry_count=0,rollback_count=0,slow_flush_count=0,write_count=0 1651474085000000000