I already talk with many Zabbix Users in Brazil and all guys like to have a optionaly new feature:

• Add checkbox in "item for the graph" to select "ignore nodata period".

This option will prevent "hole" in graph when have problems in monitoring. Note: is a OPTIONAL and NOT DEFAULT feature, so not will affect any user like holes in your Graphs to detect monitoring problems.

In case of HOLE the graph need to use the last data value to create the graph.

Example:
Moment | Value
1/1/2010 10:00 - 200
1/1/2010 11:00 - 250
1/1/2010 12:00 - 230
1/1/2010 13:00 - [nodata]
1/1/2010 14:00 - [nodata]
1/1/2010 15:00 - 260
1/1/2010 16:00 - 230
1/1/2010 17:00 - 220

Normally we have a HOLE between 1/1/2010 13:00 and 1/1/2010 14:00. With this new feature enabled zabbix will make:
Moment | Value
1/1/2010 10:00 - 200
1/1/2010 11:00 - 250
1/1/2010 12:00 - 230
1/1/2010 13:00 - iif([nodata],[lastvalidvalue],[value])
1/1/2010 14:00 - iif([nodata],[lastvalidvalue],[value])
1/1/2010 15:00 - 260
1/1/2010 16:00 - 230
1/1/2010 17:00 - 220

With this soluction we will no have a hole.

Motivation:

Currently in my enviroment we have one dashboard for each application deployed to users and this dashboard is available for END USERS.

We have some graphs with informations from 3... 4 machines IN CLUSTER... so, currently, if one of this machines is down the Graph apear with HOLE and we need to explain to a LOT OF USERS "this not impact the enviroment... we have 4 machines to answer... bla bla bla" ... This is only ONE of examples...

My Director use some graphs to show to MINISTER OF EDUCATION of Brasil to show disponibility of important systems and a graph with HOLES is not acceptable for him.

Please, another monitoring tools already make this (like cacti) its important for me and for another users.