Write restic metrics for repo filesystem for node_exporters file collector

restic-exporter.sh

#!/bin/sh

set +e
set +x

NAMESPACE=restic

BACKUP_FOLDER=/opt/backup/restic

for dir in $(find "${BACKUP_FOLDER}" -type d -maxdepth 1 -mindepth 1); do
   total_size=$(du -s "${dir}" | cut -f 1) 

   snapshots_raw=$(ls -t --full-time "${dir}/snapshots")
   snapshots_count=$(echo "${snapshots_raw}" | wc -l)
   latest_snapshot=$(echo "${snapshots_raw}" | head -n 1 | awk '{ print $6 " " $7}') 
   latest_snapshot_unix=$(date -d "${latest_snapshot}" +"%s")

   OUTPUT="${OUTPUT}${NAMESPACE}_repository_size_bytes{repository=\"${dir}\"} ${total_size}\n"
   OUTPUT="${OUTPUT}${NAMESPACE}_snapshots_count{repository=\"${dir}\"}  ${snapshots_count}\n"
   OUTPUT="${OUTPUT}${NAMESPACE}_latest_snapshot_time_seconds{repository=\"${dir}\"} ${latest_snapshot_unix}\n"
done

echo -ne $OUTPUT | sort