Kraken prices to file, so we can grab them with node exporter

price.sh

# script should be located under /adapools directory and statistic file in /adapools/stats directory
# mkdir -p /adapools/stats
# our crontab entry:
# * * * * * /adapools/price.sh
# node exporter should be reading /adapools/stats directory something like this:
# --collector.textfile.directory=/adapools/stats
# following metrics should be availlable in grafana, if you did everything right - adaeur, adausd, btcusd & ethusd
PRICES=$(curl -s https://api.kraken.com/0/public/Ticker?pair=ADAEUR,ADAUSD,XXBTZUSD,XETHZUSD)
echo $PRICES | jq .result.ADAEUR.c | jq .[0] | sed 's/"//g'| sed 's/^/adaeur /' > /adapools/stats/price.prom
echo $PRICES | jq .result.ADAUSD.c | jq .[0] | sed 's/"//g'| sed 's/^/adausd /' >> /adapools/stats/price.prom
echo $PRICES | jq .result.XXBTZUSD.c | jq .[0] | sed 's/"//g'| sed 's/^/btcusd /' >> /adapools/stats/price.prom
echo $PRICES | jq .result.XETHZUSD.c | jq .[0] | sed 's/"//g'| sed 's/^/ethusd /' >> /adapools/stats/price.prom