Any raw values form a graph or a probe can be downloaded with a rest API.
The URL for a graph is
source is either
probe, depending of the type of dates wanted.
The host is the host name.
The period_definition is described in the REST API description page.
If the query argument
epoch is present, the time stamp is provided in the epoch format, the number of seconds since January 1, 1970, 00:00:00 GMT. Otherwise the format is
dd/MM/yyyy HH:mm, using the server local time zone.