Get the recorded R session metrics.
Examples
if (FALSE) { # \dontrun{
o <- opal.login('administrator','password', url='https://opal-demo.obiba.org')
# all sessions metrics
oadmin.activity(o)
# user and profile specific session metrics
oadmin.activity(o, user = 'dsuser', profile = 'default')
# user sessions in a time range
oadmin.activity(o, user = "dsuser", from = "2022-07-01", to = "2023-01-01")
opal.logout(o)
} # }