There are quite a few nice nagios nrpe_nt plugins (vbs scripts) released by GroundWork, since 2006 they have
been working and improving these set of plugins.
Those scripts are very well written and they can be enhanced for your own platform.
I list here the functionality:
|check_100nsec_timer.vbs||checks WMI counters of type ‘PERF_100NSEC_TIMER’|
|check_counter_bulk_count.vbs||checks WMI counters of type ‘PERF_COUNTER_BULK_COUNT’|
|check_counter_counter.vbs||checks WMI counters of type ‘PERF_COUNTER_COUNTER’|
|check_counter_large_rawcount.vbs||checks WMI counters of type ‘PERF_COUNTER_LARGE_RAWCOUNT’|
|check_counter_rawcount.vbs||checks WMI counters of type ‘PERF_COUNTER_RAWCOUNT’|
|check_cpu_load_percentage.vbs||checks load percentage of one or more CPUs|
|check_disks_io.vbs||checks disk I/O of one or more logical disks|
|check_disks_percentage_space_used.vbs||checks disk usage of one or more logical disks|
|check_memory_percentage_space_used.vbs||checks RAM, page file, or total memory usage|
|check_network_io.vbs||checks network I/O of one or more TCP/IP network interfaces|
|check_raw_fraction.vbs||checks WMI counters of type ‘PERF_RAW_FRACTION’|
|check_proc_num.vbs||checks number of running processes matching a search expression|
|verify_wmi_status.vbs||checks OS version to verify WMI is working|
|check_services_states.vbs||checks the state of an installed service|
|get_computer_info.vbs||enumerates information about processors, installed services, running|
|processes, network interfaces, and logical disks for use in configuring|
|get_counter_type.vbs||enumerates information about WMI classes and properties to determine|
|which counter plugin to use|
More details are available here.
All plugins can be download here.