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Those rrdtools based tools are quite efficient.
rrdtool is one of the gems in computing, much like MQTT Neo mentioned.

As for Prometheus, give it a shot, it's not that hard :)
But i think we...

Setup metrics in file using cron, something in the line of :


TM=$(date "+%Y%m%d_%H%M")
DDUMP=/some/dir
iostat -ctdxN 15 240 >> ${DDUMP}/iostat_${TM}.out &
mpstat 15 240 >>...