Connected people through F5 vpn

You can get the current values either by showing the license or via SNMP:

K19131297:  Viewing the number of concurrent access sessions and connectivity sessions on the BIG-IP APM system

If you want to track connectivity over time, then you can use an external SNMP monitoring tool (mrtg or Solar Winds) to collect the statistics and graph them.

It is harder to get that information from the BigIP itself - there are some statistics snapshots, but there are no simple tools for querying the statistics data, and the data is aggregated over time to provide less detail.

One option is to create and upload a QKView - in the Graphs options there are Custom Interactive graphs which give options for exploring historic data.

Finally, the data used to create the graphs is stored in rrd

You can use rrdtool fetch to query this data

rrdtool fetch /var/rrd/access AVERAGE [-r|--resolution <resolution>] [-s|--start <start_time>] [-e|--end <end_time>]

However, currently the BigIP only records the AVERAGE in rrd over the data aggregation time period, not MAX, so it effectively provides the same information as in the graphs at the same level of detail.