Updated 25 October 2026 · By the Upcertain team
What single-region monitoring catches
Most outages happen at the service itself: the application crashes, a deploy breaks it, the database is full, a certificate expires, DNS records change. A checker in any one region sees all of these, because the service fails for everyone.
What it can miss
- Regional network problems. If a network route between Seoul and your server fails while the rest of the internet is fine, Upcertain sees a failure your users elsewhere may not. Confirmation checks help, because routing problems are often brief.
- Regional outages elsewhere. If your CDN fails only in Europe, a check from Seoul may pass while European users see errors.
- Geo-specific content. Sites that serve different pages by country are checked as seen from Korea.
Response times include distance
Each check records the time to the first response. A server in Europe or the Americas answers a check from Seoul more slowly than a nearby visitor sees, because the request travels further. Compare a monitor's response times with its own history, not with numbers from tools that check from closer by.
Timeouts and confirmation for distant servers
Set each monitor's timeout well above its normal response time, so a slow but working answer is not counted as a failure. Keep at least one confirmation check, so a brief routing problem between Seoul and the server does not open an incident. Most regional network problems last seconds, not minutes.
If a distant monitor fails often while your users report no problems, check its history in the incident list. A pattern of short failures at the same hour usually points at a network route, not your service.
Who it suits
- Teams in Korea, Japan and the rest of Asia-Pacific whose users are nearby.
- Services whose failures are mostly on the service itself, which is most of them.
- Teams that want fast, confirmed alerts more than a map of regional availability.
When to add another view
If your users are concentrated far from Seoul and regional problems matter to you, add a second monitor from a tool that checks from their region, or a heartbeat from a small job running near your users. The comparison pages list which tools check from several regions.
Where your data lives
Account data is stored in a Supabase Postgres database in the same region, Seoul (ap-northeast-2). See the privacy policy.