Lets map the metric to an attribute using mib tools.
Launch mib tools
This will take a while to load its mibs
Once mibtools is open, we can search for the mib we are trying to use, in this case power-ethernet
Now we can expand that mib and find the metric we are interested in, in this case
Now let's see if there is an attribute associated with it and if not, we can map one, at the top select the map tab
In this case the metric is not associated with an attribute by default, so using the map button at the top, we will map it to one.
And the metric is mapped to an attribute.
And now the metric has an attribute value:
you can now proceed to add the new metric to Report Manager.