Good tresholds for Processor Queue?

How should we think regarding Processor Queue monitoring?
We have a couple of servers that we get recurring alerts from but the servers look fine.
What is the best practice to solve these?

For example we have one Windows server that have 15 min load: 58.18 (predicted reference: 44.74) (warn/crit at 52.74/60.74) at 2 logical cores (29.09 per core)

CPU utilization (120 min average): 34.25%
User: 31.69%
Privileged: 4.39%
Number of processors: 2

Best Regards, Magnus Nordahl