Make it possible to truncate files#43
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mvdboogaard wants to merge 2 commits intocha87de:masterfrom
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This way you can add this data to Prometheus together with the JSON exporter
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We want to have the kvmtop data in Prometheus and not the setup with Logstash and Influxdb. Therefor we need to have a json file which only has the latest results.
With adding the parameter --targettruncate we can truncate the target file (only for the file option) on every run. This means we can use this json file with the json_exporter for Prometheus.