The term "Alerts" is severe events brought to your attention and covers a range of event types with different event severity from many event sources and applies across following categories:
Event types (examples)
Event sources
These different event types can come from many sources, meaning the information can come not only directly from the device, but it can also be be computed in the cloud or come from connected 3rd party services. Below are a few event source examples:
Event severities
Severity info is described in details in FAQ: What does Severity mean from Device Alerts and Account Alerts Reports
Alerts viewed in JetAdvice can vary from Dealer to Customer scopes. When an alert is present, the will be a link to the specific concern, whether it be related to a Connector, Device or Supply. It will take you to the most relevant information to display the concern.