Ok, I've figured this out myself. Here it is for reference if anyone else finds themselves asking the same question:
before :update, :notify_changes
def notify_changes
# The status property has been changed
if !dirty_attributes[Ticket.properties[:status]].nil?
# old status: original_attributes[Ticket.properties[:status]]
end
# The assigned_support property has been changed
if !dirty_attributes[Ticket.properties[:assigned_support]].nil?
# old status: original_attributes[Ticket.properties[:assigned_support]]
end
end
Inspiration Reference: This thread