A RHEL 6 host, with 1.8.15 at that time:

22164:20120909:021358.026 item [a2.example.com:system.cpu.util[,iowait,avg1]] became not supported: Type of received value [12803748151082820.000000] is not suitable for value type [Numeric (float)]
22167:20120909:021902.687 item [a2.example.com:system.cpu.util[,iowait,avg1]] became supported
22163:20120923:221459.204 item [a2.example.com:system.cpu.util[,iowait,avg1]] became not supported: Type of received value [12804192515832490.000000] is not suitable for value type [Numeric (float)]
22164:20120923:221856.325 item [a2.example.com:system.cpu.util[,iowait,avg1]] became supported

And a different RHEL 6 host, which had 1.8.14 at that time:

3269:20120803:092419.783 item [a8.example.com:system.cpu.util[,iowait,avg1]] became not supported: Type of received value [38409911451525320.000000] is not suitable for value type [Numeric (float)]
3267:20120803:093217.732 item [a8.example.com:system.cpu.util[,iowait,avg1]] became supported