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Having signatures that contain single quotes or other unsafe elements will brake the signature pie chart in the dashboard.
At line 64 through 66 the app/views/page/_graph_signature.html.erb file reads:
<% @signature_metrics.each do |key,value| %>
['<%= key.to_s %>', <%= value %>],
<% end %>
Replacing line 65 for the escaped version should avoid the problem:
['<%= j(key.to_s) %>', <%= value %>],
Thanks for the great software!