Multi-region monitoring
Checked from four regions, before we wake you up
A single monitoring location gives you a single point of failure in your alerting. Sentinel checks every site from four regions across four continents, eliminating false positives and detecting regional outages that single-location monitors miss entirely.
Multi-region check
clientsite.com
ASH · Ashburn
US East
PDX · Portland
US West
NBG · Nuremberg
Europe
SIN · Singapore
Asia Pacific
How it works
Verified from multiple regions before we alert you
Every uptime check runs simultaneously from our four monitoring regions: Ashburn (US East), Portland (US West), Nuremberg (Europe), and Singapore (Asia Pacific). When one region detects a failure, the other regions immediately verify the issue before any alert is sent.
This multi-region verification is what separates reliable monitoring from noisy monitoring. Network blips, transient routing issues, and brief DNS hiccups in a single data center will not trigger a false alert. Your on-call team only gets woken up when there is a real problem affecting real users. And when the issue is regional, Sentinel tells you exactly which regions are affected.
- Simultaneous checks from 4 global regions
- Cross-region verification eliminates false positives
- Regional vs. global outage classification in every incident
Alert decision
- Regions checked
- 4
- Reporting failure
- 1 (NBG)
- Confirmed up
- 3 (ASH · PDX · SIN)
- Classification
- Regional, not global
Three regions still reach the site, so this is not a global outage. The incident opens scoped to Europe, and your alert says so.
Features
Reliable alerting through global verification
4 global regions
Monitoring from Ashburn VA (US East), Portland OR (US West), Nuremberg Germany (Europe), and Singapore (Asia Pacific). True global coverage across four continents.
False positive elimination
A site is only marked as down after verification from multiple regions. A network blip in one data center will not trigger an alert or wake your on-call team at 3am.
Regional outage detection
Know instantly whether an issue is global or isolated to a specific region. If your site is down in Europe but up in North America, Sentinel tells you exactly that.
CDN verification
Verify your CDN serves content correctly from every edge location. Catch regional CDN misconfigurations, expired edge caches, and routing issues before your users hit them.
Global infrastructure
Four regions, four continents
Each monitoring region is strategically positioned to provide comprehensive coverage for the geographic areas where your users are located.
ASH
Ashburn, Virginia
North America (East)
Located in the largest data center corridor in the world, covering the US East Coast, Canada, and Latin America.
PDX
Portland, Oregon
North America (West)
Covering the US West Coast, Hawaii, and providing a secondary perspective for North American traffic.
NBG
Nuremberg, Germany
Europe
Central European location covering the EU, UK, Middle East, and Africa with low-latency connectivity.
SIN
Singapore
Asia Pacific
Southeast Asian hub covering APAC, India, Australia, and New Zealand for comprehensive Eastern Hemisphere coverage.
4
Monitoring regions
4
Continents covered
0
False positive alerts
Why does Sentinel monitor from multiple regions?
Monitoring from multiple regions eliminates false positives. A network blip or routing issue in one data center will not trigger an alert, because the other regions must confirm the failure first.
How many regions does Sentinel check from?
Sentinel checks every site from four global regions: Ashburn (US East), Portland (US West), Nuremberg (Europe), and Singapore (Asia Pacific). That spans four continents for true global coverage.
How does consensus prevent false alarms?
A site is only marked as down once multiple regions agree on the failure. This consensus requirement means a transient issue in a single region will not wake your on-call team in the middle of the night.
Will Cloudflare or a WAF mistake the checks for bot traffic?
SentinelBot is a verified bot in Cloudflare's Radar directory, so checks from all four regions are recognized as legitimate monitoring traffic on Cloudflare-protected sites instead of being challenged. The user agent is documented and our monitoring IPs are published for allowlisting on other firewalls.
Can Sentinel tell me if an outage is regional?
Yes. Because checks run from four regions at once, Sentinel can tell you whether an issue is global or isolated to a specific region, such as your site being down in Europe but up in North America.
How often do multi-region checks run?
The check interval depends on your plan, and the fastest plans check as often as every 30 seconds. Whatever interval you're on, all four regions check in parallel: more frequent checks mean faster detection and verification of real outages.
What happens after a real outage is confirmed?
Once an outage is verified across regions, Sentinel sends alerts by email, SMS, Slack, Discord, or webhook and opens an incident with an automatic timeline of which regions were affected.
Monitor from everywhere your users are
Start monitoring from four global regions today: eliminate false positives, detect regional outages, and verify CDN performance worldwide.
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