Custom (user defined) graphs allow the creation of complex graphs.
These graphs, once configured, can be easily accessed via Monitoring→Graphs.
Configuration of custom graphs can be accessed by navigating to Configuration→Templates or Configuration→Hosts and clicking on Graphs link for corresponding template or host.
1. if the first item was from a template, only from that template;
2. if the first item was from any host, from any host (but not from templates anymore)