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Monitoring Rest Api
This article describes how to get the internal Fluentd metrics via REST API.

Monitoring Agent

Fluentd has a monitoring agent to retrieve internal metrics in JSON via HTTP. Please add the following 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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Next, please 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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Reuse plugins

Since v0.12.17, monitor_agent plugin has tag parameter. If you set tag monitor.metrics, monitor_agent plugin emits internal metrics to monitor.metrics tag. Here is an example with stdout output.
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2015-09-16 20:28:19 +0900 monitor.metrics: {"plugin_id":"object:3fc62f0e5d64","plugin_category":"input","type":"monitor_agent","output_plugin":false,"retry_count":null}
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2015-09-16 20:28:19 +0900 monitor.metrics: {"plugin_id":"object:3fc62f0e9c84","plugin_category":"output","type":"stdout","output_plugin":true,"retry_count":null}
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Monitoring the event flow

Datadog (dd-agent) Integration

Datadog is a cloud monitoring service, and its monitoring agent dd-agent has native integration with Fluentd.
Please refer this documentation for more details.
If this article is incorrect or outdated, or omits critical information, please let us know. Fluentd is a open source project under Cloud Native Computing Foundation (CNCF). All components are available under the Apache 2 License.
Last modified 2yr ago