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add backup IO logging, Pushgateway metrics, and Grafana dashboard

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- Add /proc/self/io read/write tracking to vault raft-backup and etcd backup
- Push backup_duration_seconds, backup_read_bytes, backup_written_bytes,
  backup_last_success_timestamp to Pushgateway from all 6 backup CronJobs
  (etcd skipped — distroless image has no wget/curl)
- Add cloudsync_duration_seconds metric to cloudsync-monitor
- New "Backup Health" Grafana dashboard with 8 panels: time since last backup,
  overview table, duration/IO trends, cloud sync status, alerts, CronJob schedule
This commit is contained in:
Viktor Barzin 2026-03-23 12:19:01 +02:00
parent 0b595751c5
commit 0a294a30a6
8 changed files with 530 additions and 8 deletions
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22
stacks/redis/modules/redis/main.tf
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@ -283,15 +283,33 @@ resource "kubernetes_cron_job_v1" "redis-backup" {
image = "redis:7-alpine"
command = ["/bin/sh", "-c", <<-EOT
set -eux
_t0=$(date +%s)
_rb0=$(awk '/^read_bytes/{print $2}' /proc/self/io 2>/dev/null || echo 0)
_wb0=$(awk '/^write_bytes/{print $2}' /proc/self/io 2>/dev/null || echo 0)
TIMESTAMP=$(date +%Y%m%d-%H%M)
# Trigger a fresh RDB save on the master
redis-cli -h redis.redis BGSAVE
sleep 5
# Copy the RDB via redis-cli --rdb
redis-cli -h redis.redis --rdb /backup/redis-$TIMESTAMP.rdb
# Rotate — 7-day retention
# Rotate — 28-day retention
find /backup -name 'redis-*.rdb' -type f -mtime +28 -delete
echo "Backup complete: redis-$TIMESTAMP.rdb"
_dur=$(($(date +%s) - _t0))
_rb1=$(awk '/^read_bytes/{print $2}' /proc/self/io 2>/dev/null || echo 0)
_wb1=$(awk '/^write_bytes/{print $2}' /proc/self/io 2>/dev/null || echo 0)
echo "=== Backup IO Stats ==="
echo "duration: $${_dur}s"
echo "read: $(( (_rb1 - _rb0) / 1048576 )) MiB"
echo "written: $(( (_wb1 - _wb0) / 1048576 )) MiB"
echo "output: $(ls -lh /backup/redis-$$TIMESTAMP.rdb | awk '{print $5}')"
wget -qO- --post-data "backup_duration_seconds $${_dur}
backup_read_bytes $(( _rb1 - _rb0 ))
backup_written_bytes $(( _wb1 - _wb0 ))
backup_last_success_timestamp $(date +%s)
" "http://prometheus-prometheus-pushgateway.monitoring:9091/metrics/job/redis-backup" || true
EOT
]
volume_mount {