Снимаем свои метрики в node_exporter

Понадобилось снимать свои метрики в Prometheus и Node Exporter. Больше информации тут: https://www.robustperception.io/using-the-textfile-collector-from-a-shell-script


1) Создаем service в  /etc/systemd/system/node_exporter.service и запускаем service с ключом --collector.textfile.directory=/var/lib/node_exporter/textfile_collector

[Unit]
Description=node_exporter

[Service]
User=root
Group=root
Type=Simple
ExecStart=/etc/node_exporter/node_exporter --collector.textfile.directory=/var/lib/node_exporter/textfile_collector
WorkingDirectory=/etc/node_exporter
TimeoutSec=15
Restart=always

[Install]
WantedBy=multi-user.target


2)  Сам баш скрипт.

#!/bin/bash
	# Adjust as needed.
	#https://www.robustperception.io/using-the-textfile-collector-from-a-shell-script
	TEXTFILE_COLLECTOR_DIR=/var/lib/node_exporter/textfile_collector/
	# Note the start time of the script.
	# Your code goes here.
	sleep 10
	# Write out metrics to a temporary file.
	END="$(cat /var/log/cron | wc -l)"
	cat << EOF > "$TEXTFILE_COLLECTOR_DIR/test.prom.$$"
	test $END
	EOF
	# Rename the temporary file atomically.
	# This avoids the node exporter seeing half a file.
	mv "$TEXTFILE_COLLECTOR_DIR/test.prom.$$" \
	"$TEXTFILE_COLLECTOR_DIR/test.prom"