Number of established connections since postmaster start

Is there a way to monitor the number of connections which have been
established so far?

I'd like to graph this value, as a rough indicator whether connection
pooling is working properly.

--
Florian Weimer                <fweimer@bfk.de>
BFK edv-consulting GmbH       http://www.bfk.de/
Kriegsstraße 100              tel: +49-721-96201-1
D-76133 Karlsruhe             fax: +49-721-96201-99