metrics.txt

# HELP node_nslookup dns lookup time in ms
# TYPE node_nslookup gauge
node_nslookup{ns="1.2.3.4",record="api.cloudpayments.ru"} 0
node_nslookup{ns="8.8.8.8",record="api.cloudpayments.ru"} 15

nslookup_text_exporter.sh

#!/bin/sh
prom_file="nslookup_exporter.prom"
TEXTFILE_COLLECTOR_DIR="/var/prometheus/textfile_exporter"
lookup () {
rm ${TEXTFILE_COLLECTOR_DIR}/${prom_file}.* 2>/dev/null || true
echo "# HELP node_nslookup dns lookup time in ms" >> "${TEXTFILE_COLLECTOR_DIR}/${prom_file}.$$"
echo "# TYPE node_nslookup gauge" >> "${TEXTFILE_COLLECTOR_DIR}/${prom_file}.$$"
r="api.cloudpayments.ru"; query=$(dig $r | awk '/Query time/||/SERVER/'); echo $query | awk -F'[ #]' -v "r=$r" '{print "node_nslookup{ns=\""$8"\",record=\""r"\"} "$4}' >> "${TEXTFILE_COLLECTOR_DIR}/${prom_file}.$$"
r="api.cloudpayments.ru"; query=$(dig $r @8.8.8.8 | awk '/Query time/||/SERVER/'); echo $query | awk -F'[ #]' -v "r=$r" '{print "node_nslookup{ns=\""$8"\",record=\""r"\"} "$4}' >> "${TEXTFILE_COLLECTOR_DIR}/${prom_file}.$$"
mv "${TEXTFILE_COLLECTOR_DIR}/${prom_file}.$$" "${TEXTFILE_COLLECTOR_DIR}/${prom_file}"
}
for i in $(seq 6); do
  lookup
  sleep 10s
done