add release note
concourse/concourse#4885
#### <sub><sup><a name="4938" href="#4938">:link:</a></sup></sub> feature
* Include job label in build duration metrics exported to Prometheus. #4976
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+#### <sub><sup><a name="5023" href="#5023">:link:</a></sup></sub> fix
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+* The dashboard page refreshes its data every 5 seconds. Until now, it was possible (especially for admin users) for the dashboard to initiate an ever-growing number of API calls, unnecessarily consuming browser, network and API resources. Now the dashboard will not initiate a request for more data until the previous request finishes. #5023
