openshift/linux-metrics-exporter: Export sysstat and psacct metrics for OpenShift nodes @ 3643db26c77e56f3fe5b90fcf4725df9d8084eee

Grega Bremec 3643db26c7 sanitising fields that may be null, configurable data path, initialising non-primitive members, fixed validity checks		2 lat temu
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done	3643db26c7 sanitising fields that may be null, configurable data path, initialising non-primitive members, fixed validity checks	2 lat temu