I installed collectd, graphite(0.9.10), carbon and whisper on a debian box. Graphite displays the captured data correctly and I can build a dashboard with it.
The documentation(http://graphite.readthedocs.org/en/latest/dashboard.html) also mention that it's possible to edit and export data via JSON, but for any reason that doesn't work. If I go to a dashboard and click on the dashboard menu, then I can't see "Edit Dashboard".
Do you have any idea how to get "Edit Dashboard" in the dashboard working?