I have some items that are not filling the graph lines properly. Usually these items have an update interval of 1h and above, but smaller update intervals also apply, specially if they have a "discard unchanged" preprocess.
An example is the default Zabbix database size from the "MySQL by Zabbix Agent 2" template, which collects data every 5m with a 1h "discard unchanged with heartbeat".
The screenshot bellow shows the data points not connected in a 4 day time span.
Only if I increase the time span to 5 days or higher, it starts connecting the dots.
This only happens with the classic graphs and prototypes graphs.
The dashboard pretty graphs show all data connected as a line graph should be, even with small time filters.

Any idea why is that?
An example is the default Zabbix database size from the "MySQL by Zabbix Agent 2" template, which collects data every 5m with a 1h "discard unchanged with heartbeat".
The screenshot bellow shows the data points not connected in a 4 day time span.
Only if I increase the time span to 5 days or higher, it starts connecting the dots.
This only happens with the classic graphs and prototypes graphs.
The dashboard pretty graphs show all data connected as a line graph should be, even with small time filters.
Any idea why is that?