Thank you Joe! Now I have my custom counters appearing as data sources for all my servers (on the Hosts tab). I can also see all instances of the counters on the graphs on the Hosts tab. However, I cannot add those instances to custom graph widgets. When I am creating the a new widget, I click on Add button next to Datapoint, and there I can specify name, host, datasource, but not datapoint. As far as I understand, those datapoints represent instances of the counters (which I can see on graphs on the Hosts tab), but somehow they are not showing up in the New Widget - Custom Graph form -- the list is always empty for all of my custom counters. Do you have any suggestions for me regarding how to make it work?
