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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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25
stacks/infra-maintenance/modules/infra-maintenance/main.tf
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@ -102,7 +102,30 @@ resource "kubernetes_cron_job_v1" "backup-etcd" {
name = "backup-etcd"
image = "registry.k8s.io/etcd:3.5.21-0"
command = ["/bin/sh", "-c"]
args = ["ETCDCTL_API=3 etcdctl --endpoints=https://127.0.0.1:2379 --cacert=/etc/kubernetes/pki/etcd/ca.crt --cert=/etc/kubernetes/pki/etcd/healthcheck-client.crt --key=/etc/kubernetes/pki/etcd/healthcheck-client.key snapshot save /backup/etcd-snapshot-$(date +%Y%m%d-%H%M%S).db"]
args = [<<-EOT
set -eu
_t0=$(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%S)
ETCDCTL_API=3 etcdctl \
--endpoints=https://127.0.0.1:2379 \
--cacert=/etc/kubernetes/pki/etcd/ca.crt \
--cert=/etc/kubernetes/pki/etcd/healthcheck-client.crt \
--key=/etc/kubernetes/pki/etcd/healthcheck-client.key \
snapshot save /backup/etcd-snapshot-$TIMESTAMP.db
_dur=$(($(date +%s) - _t0))
_rb1=$(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: $(ls -lh /backup/etcd-snapshot-$TIMESTAMP.db | awk '{print $5}')"
EOT
]
env {
name = "ETCDCTL_API"
value = "3"