Monitoring by REST API

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This article describes how to get the internal Fluentd metrics via the REST API.
Monitoring Agent
Fluentd has a monitoring agent to retrieve internal metrics in JSON format via HTTP.
Add these lines to your configuration file:
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<source>
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  @type monitor_agent
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  bind 0.0.0.0
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  port 24220
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</source>
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Restart the agent and get the metrics via HTTP:
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$ curl http://host:24220/api/plugins.json
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{
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  "plugins":[
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    {
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      "plugin_id":"object:3fec669d6ac4",
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      "type":"forward",
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      "output_plugin":false,
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      "config":{
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        "type":"forward"
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      }
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    },
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    {
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      "plugin_id":"object:3fec669dfa48",
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      "type":"monitor_agent",
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      "output_plugin":false,
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      "config":{
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        "type":"monitor_agent",
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        "port":"24220"
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      }
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    },
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    {
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      "plugin_id":"object:3fec66aead48",
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      "type":"forward",
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      "output_plugin":true,
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      "buffer_queue_length":0,
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      "buffer_total_queued_size":0,
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      "retry_count":0,
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      "config":{
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        "type":"forward",
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        "host":"192.168.0.11"
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      }
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    }
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  ]
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}
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See in_monitor_agent article for more detail.
Monitoring the Event Flow
Use flowcounter or flowcounter_simple plugin.
Datadog (dd-agent) Integration
​Datadog is a cloud monitoring service, and its monitoring agent dd-agent has native integration with Fluentd.
For more details:
​Datadog-Fluentd Integration​
If this article is incorrect or outdated, or omits critical information, please let us know. Fluentd is an open-source project under Cloud Native Computing Foundation (CNCF). All components are available under the Apache 2 License.

Monitoring by Prometheus

Input Plugins

Last modified 4mo ago

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Contents

Monitoring Agent

Monitoring the Event Flow

Datadog (dd-agent) Integration