- Most metric name checks in the procstat parser now use plain C string
    matching instead of regular expressions
- Overhead has been reduced to 1.09% for a full vmstat + meminfo +
    procstat instantiation on a CoolMUC3 node (2700+ metrics each sec)
- Overhead for a minimal meminfo instantiation is 0.05% (44 metrics)
- We can safely assume linear scaling of the plugin in function of the
    number of metrics