A Spotlight on System Overview Dashboard Introduced in AEM 6.4

With AEM 6.4,  several new features have been incorporated into Adobe Experience Manager to make life easier for both developers as well as content authors. Here we are going to explore the System Overview Dashboard feature in detail.
In the previous versions of AEM, administrators need to look up at different places to collect information about the running AEM instance. With this new System Overview Dashboard feature, you can get the high-level overview of configurations, hardware Details, running instance details, etc. in a unified window. This will be useful when you need to monitor the System Performance at periodic intervals or to diagnose when the system goes down.

You can access the System Overview Dashboard by navigating to,
Start -> Tools -> Operations -> System Overview Dashboard

Instance Details – You can check the currently running instance details like AEM Version, different Run modes configured, Instance up Time, etc.
System Information – Here you can see the OS detail on which the current AEM instance is running along with hard disk space and maximum heap size.
Repository Details – You can see the Repository [JCR] Version, node and file data store type used like Tar MK or MongoMK etc. and the repository size. Checking the repository growth at a specific time intervals and doing revision cleanup is essential to avoid application failure due to memory overflow.
Estimated node counts – This will show you the total Node count of JCR, the total number of Pages, Components and Assets available in your AEM Instance.

Health Checks – You can see warnings, errors if some health checks were failed, or something that needs to be performed immediately.
Maintenance Tasks – Here you can check the status of all kinds of maintenance tasks related to AEM like version purging, Data Storage Garbage Collection, Audit log maintenance, etc.
Status of Workflows, Replication Agents, Sling jobs and Distribution Agents – You can check the status of the configured workflows and the status of replication & distribution agent to see whether it is active or idle or queue is stuck etc. to take appropriate actions immediately. It will also display the sling jobs status [Active/Failed] that is running in the background.
Backup and indexing Information –Here you can check when the last revision backup has been run and also the JCR indexing details.
The information from the System Overview Dashboard can be exported as JSON by clicking the download button. The information is also exposed via the following REST endpoint,
<server-host>/libs/granite/operations/content/systemoverview/export.json.
This will be useful if you want to share System performance or current running status of the instance with Team or other external people via email.