Check Command:  check_iperf / check_iperf3
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Monitor the speed between network links using the Linux `iperf` or `iperf3` command respectively.

Arguments
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``Critical`` A number representing the low unit result to treat service as critical.

``Warning`` A number representing the low unit result to treat service as warning.

``Speed [Optional]`` Set the test speed (E.g., 40M or 1G).

Source
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- https://exchange.nagios.org/directory/Plugins/Network-Connections%2C-Stats-and-Bandwidth/check_iperf/details
- https://exchange.nagios.org/directory/Plugins/Network-Connections,-Stats-and-Bandwidth/check_iperf3/details