Some F5 BIG IP's do not support the hrProcessorLoad OID in the HOST-RESOURCES-MIB, and therefor do not correctly report CPU or memory.
From referencing the following thwack post, I created the necessary pollers and transforms to correctly report both CPU and memory.
For CPU Utilization.
1 "sysStatTmTotalCycles -"Traffic management CPU usage." OID="1.3.6.1.4.1.3375.2.1.1.2.1.41"
2 "sysStatTmIdleCycles" -Traffic management CPU usage. OID="1.3.6.1.4.1.3375.2.1.1.2.1.42"
3 Transform -Formula="100-({sysStatTmIdleCycles}/{sysStatTmTotalCycles}*100)
For Memory Utilization.
1 "sysStatMemoryTotal-="The total memory available in bytes for TMM (Traffic Management Module)." OID="1.3.6.1.4.1.3375.2.1.1.2.1.44"
2 "sysStatMemoryUsed" ="The memory in use in bytes for TMM (Traffic Management Module)." OID="1.3.6.1.4.1.3375.2.1.1.2.1.45"
3 Transform -Formula="{sysStatMemoryUsed}/{sysStatMemoryTotal}*100