Some numbers on today’s Outlook outage, from Sentinel’s probes in 15 regions.
The first sign was at 12:50 PM ET, a 35-second wobble in eight regions that cleared by itself. At 12:59 it came back and stayed. Ten regions were timing out when the incident opened.
It’s now 8:39 PM and all 15 are failing. These aren’t slow pages or error codes. The connection never completes, from Ashburn, London, Tokyo, Johannesburg and everywhere else I check from.
One caveat. This measures whether https://t.co/QZrPtKeWYX answers at the front door. It can’t see whether mail is flowing for people whose apps are already signed in, so the recovery Microsoft describes may be real for some of them.
The page updates every five minutes if you want to watch it come back:
https://t.co/LGubFwYrPQ
London and Chicago are live.
Sentinel now checks every site from 6 regions on every plan. Not “check from one place, then confirm somewhere else if it fails.” Every region. Every check.
14 is the goal.
https://t.co/Q0b2QmXcYF
Sentinel now sends alerts to Telegram.
No bot to build, no token to copy, no chat ID to hunt down. Add a chat, tap Start, and you're connected.
Direct messages, groups, and channels all work, with severity controls for each one.
Free on every plan.
https://t.co/ouybhQX0ey
Sentinel's machine-payable API is growing.
AI agents can now purchase monitoring and infrastructure capabilities directly using x402, including global URL checks, API checks, DNS, SSL, domain checks, and durable wake-up calls.
No account or subscription required.
https://t.co/LofvsPjKpu
The Sentinel free plan just got a lot bigger.
Uptime, SSL, DNS, domain expiry, keyword, ping, port, and JSON API checks are all free now. The same checks paid plans run, on 10 monitors at 5-minute intervals.
You also get read-only API and MCP access, so you can point Claude or any MCP client at your monitors and ask what's down. The Mac menu bar app works on free now too.
No credit card. https://t.co/w7RMRfSDf5
Sentinel Is Now on the Slack Marketplace
The official Sentinel Slack app is now on the Slack Marketplace: down and recovery alerts in your channels, per-channel installs with severity filtering, revie… https://t.co/R29jUlhYd4
Sentinel Now Detects PHP Errors, Stack Traces, and Server Warnings Automatically
Sentinel now automatically detects PHP errors, stack traces, WordPress critical errors, SQL errors, and framework debug pages during normal HTTP monitoring. No… https://t.co/BKqfCLQG8E
New in Sentinel: your deploys now show up on your uptime charts.
Push to main and a marker lands on the response-time graph. When something breaks, the incident page tells you if you shipped in the last hour, because that's always the first question anyway.
Free on every plan. The app can't read your code.
https://t.co/9LpiTSr71g
UptimeRobot raised prices this week. Solo is now $11/mo for 10 monitors at 1-minute checks.
We're a competitor, so grain of salt, but the math is worth doing: Sentinel Starter is $14 for 25 monitors at the same interval, with Slack alerts and status pages included. And our free plan allows client work.
Honest comparison, including where they beat us: https://t.co/uZQF2DtUjA
Sentinel now has an official Slack app.
One click, no webhook URLs: install from your dashboard, pick a channel, and downtime alerts land where your team already looks. Connect a channel per client, and each one chooses what it hears: outages, warnings, recoveries.
It asks for a single permission and reads nothing from your workspace.
https://t.co/cr14PPmQDT
Ask Claude if anything is down.
We connected Sentinel to Claude over MCP: live status, incident triage, certificate deadlines, and a global URL probe, all in conversation. Debugging a deploy in Claude Code? Pause the monitor without leaving the chat.
Now in the official MCP registry.
https://t.co/MAWxXsiD9A
Your Monitoring Dashboard Is a Tab You Never Open
Alerts tell you when something changes. They cannot tell you that nothing has, which is the failure agencies actually fear. Why passive awareness beats another… https://t.co/KohKKbVqM5
Your Site Can Return 200 and Still Be Down
A status code tells you the server answered, not that it answered with your website. Why managed hosts serve error pages at 200, and why a keyword check that a..https://t.co/xZKIXZGQNy
If you manage WordPress sites for clients, downtime isn't just an inconvenience. It's your reputation.
That's exactly why I built Sentinel.
Thanks to @thewpweekly for featuring us this week. 🙌