By default statistics produce counter, for example cumulative,
values. You can change this with StatsType parameter.
Format specifiers, such as %{GlobalVar:name}, are
evaluated when the configuration is loaded. The parameter value is the
output type and can be one of:
cumulative: cumulative counter shows the
number of processed packets.derivative: derivative is the difference (delta)
between two counter values in time interval.packet_rate: packet rate is the amount
of packets transferred within time interval (packets per second).all: all produces output from all
available statistic types (cumulative, derivative and
packet_rate).
The default output type is
cumulative.
# We are interested in the difference (delta)
StatsType derivative
