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Each service can define which metrics AMS should collect and provide by defining a metrics.json file.
You can read about the metrics.json file format in the Stack Defined Metrics page. 

A service can add a list of quick links to the Ambari web UI by adding metainfo to a text file following a predefined JSON format. Ambari server parses the quicklink JSON file and provides its content to the UI. So that Ambari web UI can calculate quick link URLs based on the information and populate the quicklinks drop-down list accordingly. 

Read more about quick links JSON file design in the Quick Links page.

Widgets

Each service can define which widgets and heatmaps show up by default on the service summary page by defining a widgets.json file.

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