unable to display graph for curl_json from couchdb stats

[zeng]

Hi guys,

Has anyone manage to display disk-size stats graph from curl_json, more specifically stats from couchdb? 

The graph for dbs/*doc_del_count, dbs/gauge*-doc_count are displaying fine, but the database size graph is missing, in the browser it just a broken image icon.

The log shows:

localhost - - [10/May/2012 17:35:33] "GET /cgi-bin/collection.modified.cgi?action=show_graph;plugin=curl_json;type=bytes;plugin_instance=dbs;type_instance=_users-disk_size;host=testi;timespan=hour;start=16:35%20May%2010%202012;end=17:35%20May%2010%202012; HTTP/1.1" 200 -

Which seems to indicate things are all fine?

Any hint?

Many thanks!