apt-text-collector.sh

#!/bin/bash

: ${TEXT_COLLECTOR_DIR:="/var/tmp/node_exporter"}
OUTPUT_FILE=${TEXT_COLLECTOR_DIR}/apt.prom
TEMP_OUTPUT_FILE=${OUTPUT_FILE}.tmp

upgrades=$(/usr/lib/update-notifier/apt-check 2>&1)
# output format for apt-check is $upgrades;$security_upgrades

(
echo '# HELP apt_packages_available_for_upgrade_count Apt upgrades pending.'
echo '# TYPE apt_packages_available_for_upgrade_count gauge'
echo 'apt_packages_available_for_upgrade_count' $(echo $upgrades|cut -d';' -f1)
echo '# HELP apt_security_packages_available_for_upgrade_count Apt security upgrades pending.'
echo '# TYPE apt_security_packages_available_for_upgrade_count gauge'
echo 'apt_security_packages_available_for_upgrade_count' $(echo $upgrades|cut -d';' -f2)

echo '# HELP node_reboot_required Node reboot is required for software updates.'
echo '# TYPE node_reboot_required gauge'
if [[ -f '/run/reboot-required' ]] ; then
  echo 'node_reboot_required 1'
else
  echo 'node_reboot_required 0'
fi

# note that this gets updated even if apt fails (partially) so if this timestamp is
# fresh that is no guarantee all of the package list is
apt_update_stamp=$(date +%s -r /var/lib/apt/periodic/update-success-stamp 2>/dev/null || echo 0)
echo '# HELP apt_update_timestamp Timestamp apt sources were last updated successfully'
echo '# TYPE apt_update_timestamp gauge'
echo 'apt_update_timestamp' $apt_update_stamp
) >${TEMP_OUTPUT_FILE}
mv ${TEMP_OUTPUT_FILE} ${OUTPUT_FILE}