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add e2e email roundtrip monitoring

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CronJob (every 30 min) sends test email via Mailgun API to
smoke-test@viktorbarzin.me, verifies IMAP delivery in spam@ catch-all,
deletes test email, pushes metrics to Pushgateway + Uptime Kuma.

Prometheus alerts: EmailRoundtripFailing, EmailRoundtripStale,
EmailRoundtripNeverRun. Uptime Kuma: SMTP/IMAP port checks + E2E push.
This commit is contained in:
Viktor Barzin 2026-03-25 22:50:22 +02:00
parent b9c2d7c1f6
commit 78dec8f0ad
5 changed files with 256 additions and 19 deletions
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@ -116,6 +116,7 @@ Repo IDs: infra=1, Website=2, finance=3, health=4, travel_blog=5, webhook-handle
- Exclude completed CronJob pods from "pod not ready" alerts.
- Every new service gets Prometheus scrape config + Uptime Kuma monitor.
- Key alerts: OOMKill, pod replica mismatch, 4xx/5xx error rates, UPS battery, CPU temp, SSD writes, NFS responsiveness, ClusterMemoryRequestsHigh (>85%), ContainerNearOOM (>85% limit), PodUnschedulable.
- **E2E email monitoring**: CronJob `email-roundtrip-monitor` (every 30 min) sends test email via Mailgun API to `smoke-test@viktorbarzin.me` (catch-all → `spam@`), verifies IMAP delivery, deletes test email, pushes metrics to Pushgateway + Uptime Kuma. Alerts: `EmailRoundtripFailing` (90m), `EmailRoundtripStale` (90m), `EmailRoundtripNeverRun` (2h). Vault: `mailgun_api_key` in `secret/viktor`.
## Storage & Backup Architecture