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. |
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