+sub port_graph {
+ my $p = shift;
+ _usage_details( \&_port_graph, $p,
+ 'svcdb' => 'svc_port',
+ );
+}
+
+sub _port_graph {
+ my($svc_port, $begin, $end) = @_;
+ my @usage = ();
+ my $pngOrError = $svc_port->graph_png( start=>$begin, end=> $end );
+ push @usage, { 'png' => $pngOrError };
+ (@usage);
+}
+