Integer oid monitor treated as string on threshold configuration

Integer oid monitor treated as string on threshold configuration

I'm trying to monitor load average.
I've found this oid  .1.3.6.1.4.1.2021.10.1.5.1 that according to smnpwalk is returning and integer value.
  1. UCD-SNMP-MIB::laLoadInt.1 = INTEGER: 78
When I add this snmp oid in my opmanager, I cannot configure the threshold as an  integer (> <, =), opmanager treat it as string "contains value".

How could I resolve this problem?

Thanks in advance.