When 'Show legend' option is active in a pie chart, a lot of space is lost on the right side as can be seen in attached zabbix_pie.png.
I have attached a patch that:
- removes 'Value:' useless label
- moves values next to item names
- centers pie horizontally
After applying this patch, the pie looks like attached zabbix_pie_optimized.png and graph width can be reduced.