I apologise to those who received the broadcast message. I didn't realise I clicked the broadcast to Gold box.

Well, you got me. Made me look ;-)

The difference between the 4 hour and the real time may actually be correct.  Unless you have your data to roll up quickly it is only going to show each point as a single polled value not an average over time.

As for the OID I would say that needs to be a feature request.  When you do post the link here so we can add our vote.  That would be very benificial in multiple areas.

In WUG, real time graphs are referred to as "Split Second Graphs" (SSG).  You can add the SSG's to a dashboard just like a historical graph:

1. Add content (big green plus sign)
2. Split Second Graphs (folder)
3. Select Performance monitor
4. Menu -> configure (the perf monitor SSG element you just selected)
5. Under graph name, click the (...) button
6. Add whatever WMI and/or SNMP datapoints via the "WMI" and "SNMP" icons in the top right.  There is a bug in some versions of WUG that will cause this window to appear with incorrect (very small) dimensions.  If this happens, simply grab a corner of the window and drag to resize.
7. Save the graph once it looks like you want (datapoints, colors, description, etc).  Keep in mind you can graph counters from multiple systems in a single graph.
8. From within the graph, click "File -> Save Graph As" and give it a name.
9. Click "OK" from the graph dialog to return to the performance monitor SSG element configuration.
10. Select the name of the graph you just created from the dropdown.

You should now have a realtime, updating graph on your dashboard.  See the following example, from my WUG system:

Hi Brian,

Thank you for your response.
There are two problems with using the SSG graph for a performance monitor like this.
1. The SSG Graph for Perf Mon is only available on a workspace view and not on a device view.   I will add this to my list of feature requests.

2. The SSG doesn't provide history and only polls while you are viewing the workspace. For example, this particular monitor tracks the non-unicast packets. When we have something funny going on, we want to be able to look for a spike at a particular time, rather then watch for a spike in real time.

I did encounter the small window bug also. Let me know if you need any details regarding that bug.

Paul, I believe (I could be wrong) the real time graph plots out the difference between last and current value, where as the 4hr graph averages an absolute value. I don't think it is accurate to display a 0 when the real time never displayed 0 for enough time for it to to be an average of 0. 

Onto bugs regarding custom performance monitor, here is one showing the data going back in time. I can only think the time recorded for the plot points changed, but I have no idea why because no other graphs were affected at this time.

Still on top if of Performance Monitor bugs. I have created a perf mon for cpu utilisation for our 8600 chassis. In the pictures below you can see that the SNMP credentials and OID are correct, because I am able to walk as well as view the utilsation in real time. However WUG shows that there is no data available and won't graph the last 2/4/8 hours.

And finally, I will create a feature request so that you can copy and modify the standard interface/cpu/memory performance monitor to a different OID. This way all of the graphs will be available if your device does not support the preconfigured OID (usually standard) that is in these monitors.

With regards to the monitor working in real-time but showing no data on the last 8 hours graph, I fixed this by restarting the WUG services.