Plugin Tag፥ outage
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YoPingMe – Uptime Monitoring & Status Pages
Uptime monitoring in wp-admin: every monitor's status, its outage and downtime history, and a status page strip. Free YoPingMe account.
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Titanium Service Zones – Maintenance Mode, Coming Soon & Page Control
Selective maintenance and service-status control for WordPress. Keep unaffected parts online with up to three independent Service Zones.