logstash/docs/reference/monitoring-logstash-with-elastic-agent.md

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https://www.elastic.co/guide/en/logstash/current/monitoring-with-ea.html

Monitoring Logstash with Elastic Agent [monitoring-with-ea]

You can use {{agent}} to collect data about {{ls}} and ship it to the monitoring cluster. When you use {{agent}} collection, the monitoring agent remains active even if the {{ls}} instance does not. Plus you have the option to manage all of your monitoring agents from a central location in {{fleet}}.

{{agent}} gives you a single, unified way to add monitoring for logs, metrics, and other types of data to a host. Each agent has a single policy you can update to add integrations for new data sources, security protections, and more.

You can use {{agent}} to collect {{ls}} monitoring data on:

• {{ecloud}} or self-managed dashboards.
  {{agent}} collects monitoring data from your {{ls}} instance, sends it directly to your monitoring cluster, and shows the data in {{ls}} dashboards. {{ls}} dashboards include an extended range of metrics, including plugin drilldowns, and plugin specific dashboards for the dissect filter, the grok filter, and the elasticsearch output.
• {{ecloud}} dashboards (serverless).
  {{agent}} collects monitoring data from your {{ls}} instance, sends it to Elastic serverless, and shows the data in {{ls}} dashboards in Elastic Observability. {{ls}} dashboards include an extended range of metrics, including plugin drilldowns, and plugin specific dashboards for the dissect filter, the grok filter, and the elasticsearch output.
• {{stack}} monitoring.
  Use the Elastic Stack monitoring features to gain insight into the health of {{ls}} instances running in your environment.