In the section such as :

Getting information about alerts, silences, and alerting rules from the Administrator perspective 

we have the following paragraph:

1. Click the name of an alert to view its Alert details page. The page includes a graph that illustrates alert time series data. It also provides the following information about the alert:

• A description of the alert
• Messages associated with the alert
• Labels attached to the alert
• A link to its governing alerting rule
• Silences for the alert, if any exist
   

It would be also beneficial to mention that the users can find runbook URLs there.

Screenshot for context: