ansible-role-borgbackup/templates/borg_exporter.j2

#!/bin/bash
{{ ansible_managed | comment }}

set -eu

LOGFILE=/var/log/borg
TEXTFILE_COLLECTOR_DIR=/var/lib/prometheus/node-exporter
PROM_FILE=$TEXTFILE_COLLECTOR_DIR/backup.prom
TMP_FILE=$PROM_FILE.$$
HOSTNAME=$(hostname)

BORG_INFO=$(borgmatic --no-color info --last 1 ) || mv $TMP_FILE $PROM_FILE
echo "backup_last_run{host=\"${HOSTNAME}\"} $(echo "$BORG_INFO" | grep "Time (start)" | awk '{print $4}')" >> $TMP_FILE
echo "backup_files{host=\"${HOSTNAME}\"} $(echo "$BORG_INFO" | grep "Number of files" | awk '{print $4}')" >> $TMP_FILE
echo "backup_chunks_unique{host=\"${HOSTNAME}\"} $(echo "$BORG_INFO" | grep "Chunk index" | awk '{print $3}')" >> $TMP_FILE
echo "backup_chunks_total{host=\"${HOSTNAME}\"} $(echo "$BORG_INFO" | grep "Chunk index" | awk '{print $4}')" >> $TMP_FILE

function calc_bytes {
	NUM=$1
	UNIT=$2
	
	case "$UNIT" in
		kB)
			echo $NUM | awk '{ print $1 * 1024 }'
			;;
		MB)
			echo $NUM | awk '{ print $1 * 1024 * 1024 }'
			;;
		GB)
			echo $NUM | awk '{ print $1 * 1024 * 1024 * 1024 }'
			;;
		TB)
			echo $NUM | awk '{ print $1 * 1024 * 1024 * 1024 * 1024 }'
			;;
	esac
}

# byte size
LAST_SIZE=$(calc_bytes $(echo "$BORG_INFO" |grep "This archive" |awk '{print $3}') $(echo "$BORG_INFO" |grep "This archive" |awk '{print $4}'))
LAST_SIZE_COMPRESSED=$(calc_bytes $(echo "$BORG_INFO" |grep "This archive" |awk '{print $5}') $(echo "$BORG_INFO" |grep "This archive" |awk '{print $6}'))
LAST_SIZE_DEDUP=$(calc_bytes $(echo "$BORG_INFO" |grep "This archive" |awk '{print $7}') $(echo "$BORG_INFO" |grep "This archive" |awk '{print $8}'))
TOTAL_SIZE=$(calc_bytes $(echo "$BORG_INFO" |grep "All archives" |awk '{print $3}') $(echo "$BORG_INFO" |grep "All archives" |awk '{print $4}'))
TOTAL_SIZE_COMPRESSED=$(calc_bytes $(echo "$BORG_INFO" |grep "All archives" |awk '{print $5}') $(echo "$BORG_INFO" |grep "All archives" |awk '{print $6}'))
TOTAL_SIZE_DEDUP=$(calc_bytes $(echo "$BORG_INFO" |grep "All archives" |awk '{print $7}') $(echo "$BORG_INFO" |grep "All archives" |awk '{print $8}'))


echo "backup_last_size{host=\"${HOSTNAME}\"} $LAST_SIZE" >> $TMP_FILE
echo "backup_last_size_compressed{host=\"${HOSTNAME}\"} $LAST_SIZE_COMPRESSED" >> $TMP_FILE
echo "backup_last_size_dedup{host=\"${HOSTNAME}\"} $LAST_SIZE_DEDUP" >> $TMP_FILE
echo "backup_total_size{host=\"${HOSTNAME}\"} $TOTAL_SIZE" >> $TMP_FILE
echo "backup_total_size_compressed{host=\"${HOSTNAME}\"} $TOTAL_SIZE_COMPRESSED" >> $TMP_FILE
echo "backup_total_size_dedup{host=\"${HOSTNAME}\"} $TOTAL_SIZE_DEDUP" >> $TMP_FILE

mv $TMP_FILE $PROM_FILE