Collect journald stats for prometheus-node-exporter

journald_stats.sh

#!/bin/bash
#
# Description: Expose metrics from journald.
#
# Author: Sergei Eremenko (https://github.com/SmartFinn)

echo '# HELP journald_disk_usage Disk usage of all journal files in bytes.'
echo '# TYPE journald_disk_usage counter'
if [ -d /run/log/journal ]; then
	echo 'journald_disk_usage{storage="temprary"}' \
		"$(($(du -bs --threshold=512 /run/log/journal/ | cut -f1 -d$'\t')))"
else
	echo 'journald_disk_usage{storage="temprary"} 0'
fi

if [ -d /var/log/journal ]; then
	echo 'journald_disk_usage{storage="persistent"}' \
		"$(($(du -bs --threshold=512 /var/log/journal/ | cut -f1 -d$'\t')))"
else
	echo 'journald_disk_usage{storage="persistent"} 0'
fi

echo '# HELP journald_events_total Total number of journal entries.'
echo '# TYPE journald_events_total counter'
echo 'journald_events_total' \
	"$(journalctl --output=cat --output-fields=_BOOT_ID | wc -l)"

prometheus-node-exporter-journald-stats.service

[Unit]
Description=Collect journald stats for prometheus-node-exporter

[Service]
Type=oneshot
Environment=TMPDIR=/var/lib/node_exporter/textfile_collector
ExecStart=/bin/bash -c "/usr/share/node-exporter-textfile-collector/journald_stats.sh | sponge /var/lib/node_exporter/textfile_collector/journald_stats.prom"

prometheus-node-exporter-journald-stats.timer

[Unit]
Description=Run journald_stats.sh every minute

[Timer]
OnBootSec=0
OnUnitActiveSec=1min

[Install]
WantedBy=timers.target