feat(alerts): backend.down trigger — HAProxy socket check every 2 min, 12h dedupe
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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@@ -1116,7 +1116,7 @@
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"title": "Health alerts",
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"intro": "Notification channels for critical events. Webhook (Slack/Discord/Teams/generic-HTTP) or email (SMTP). Triggers: cert.expiring (<14 d), cert.renew_failed, backup.failed, license.invalid.",
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"scopeTitle": "What triggers alerts?",
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"scopeDesc": "cert.expiring — TLS cert <14 days remaining (12 h dedupe). cert.renew_failed — ACME renewer cycle had failures. backup.failed — scheduled backup couldn't run. license.invalid — License server returns valid=false. More triggers coming (backend-down, disk usage).",
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"scopeDesc": "cert.expiring — TLS cert <14 days remaining (12 h dedupe). cert.renew_failed — ACME renewer cycle had failures. backup.failed — scheduled backup couldn't run. license.invalid — License server returns valid=false. backend.down — all servers in a backend pool are DOWN (2 min check, 12 h dedupe). disk.full — root filesystem ≥80% warning, ≥90% critical (hourly check, 12 h dedupe).",
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"tabs": { "channels": "Channels", "events": "History" },
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"add": "Add channel",
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"addTitle": "Add notification channel",
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