canvas-lms/app/messages/rubric_association_created.twitter.erb

<% define_content :link do %>
  http://<%= HostUrl.context_host(asset.context) %>/<%= asset.context.class.to_s.downcase.pluralize %>/<%= asset.context_id %>/rubrics/<%= asset.rubric_id %>
<% end %>
<%= t :tweet, "Canvas Alert - New Assessment: %{title}, %{context}.", :title => asset.title, :context => asset.context.name %>