For those looking for the data in the API, you can find it here
<configResolveClass cookie="your-auth-cookie" inHierarchical="false" classId="etherErrStats" />
<configResolveClass cookie="your-auth-cookie" inHierarchical="false" classId="etherTxStats" />
<configResolveClass cookie="your-auth-cookie" inHierarchical="false" classId="etherRxStats" />
<configResolveClass cookie="your-auth-cookie" inHierarchical="false" classId="fcStats" />
These don't seem to be documented anywhere. If you read through the SNMP MIB you can find the managed object for most of the calls. I had to use API instead of SNMP since not all my UCSMs have the CIMC 1.4 (which expose the full UCS tree)