Notification types

Five types ship with a color, an icon and a sound of their own, all three held in config.types. Restyling every success notification on the server is one edit there.

A payload naming a type that does not exist falls back to info. color and icon on the payload override the type for that one notification, which is how a job or a gang gets its own accent without a new type.

Images show sample notifications in a browser preview with the light theme applied for capture.