Lets map the metric to an attribute using mib tools.
Launch mib tools
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This will take a while to load its mibs
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Once mibtools is open, we can search for the mib we are trying to use, in this case power-ethernet
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Now we can expand that mib and find the metric we are interested in, in this case
pethMainPseConsumptionPower, 1.3.6.1.2.1.105.1.3.1.1.4.
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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
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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.
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And the metric is mapped to an attribute.
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And now the metric has an attribute value:
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you can now proceed to add the new metric to Report Manager.