System DataSource

PV syntax

The standard prefix for the datasource is sys:// which can be omitted if configured as the default datasource.

Syntax	Description
`sys://time`	Local date and time
`sys://free_mb`	Free Java VM memory in MB
`sys://used_mb`	Used Java VM memory in MB
`sys://max_mb`	Maximum available Java VM memory in MB
`sys://user`	User Name
`sys://host_name`	Host name
`sys://qualified_host_name`	Full Host Name
`sys://system.*`	Any system property, e.g. "sys://system.user.name"