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Web Development
Uptime is the share of time a website is online and working. 99.9% uptime still allows about 8.8 hours of downtime a year.
Hosts often promise uptime in a service-level agreement. Monitoring tools check the site every minute or so and alert the team when it goes down.
Common causes of downtime include server overload, expired domains or certificates, failed updates, and attacks.
Example
An uptime monitor texts the developer when a site goes down at night after a failed plugin update, and it is restored within minutes.
Why it matters
Every minute offline loses visitors and enquiries, and long or frequent outages can hurt rankings.
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