Add a 'peak' indicator to the gauge widget

[jwilling]

It would be nice to see a 'peak' indicator of some kind added to the gauge widget. Perhaps a tick mark at the peak point which could be reset either manually or on a scheduled basis.
Seems like that would be really handy for checking peak values on monitored interfaces.

[cyber]

Ideas for future developments go here https://support.zabbix.com/projects/ZBXNEXT/issues