I have Pingdom monitor two (2) of my web sites, that are on Shared hosting, with a provider in Connecticut, USA. I have them monitor every five (5) minutes.
I believe Pingdom monitors with 25 or 30 servers, located around the world, and they rotate. They are very accurate.
I do not have them monitor every minute, because I do not want to get more notifications. If I did, the uptime would probably be a little lower than shown below, which was for May 2011, because of network connectivity issues, etc.
Uptime Downtime Outages Response time
100.00% 0h 00m 00s 0 568 ms
A few days ago, in June 2011, there was a brief outage, of approximately ten (10) minutes, reported by Pingdom.
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Last edited by anon-e-mouse; 06-05-2011 at 05:51 PM.
When pingdom first detects your server being down, it runs a trace route from that location and records it, then runs a trace route from a different location - you should be able to pull these up and provide them to your web host so they can look into the cause of the outage.
Welp, if they are going to use the terms "server never went down" that could mean a lot of things. That could be a result from monitoring the power. Hostleet mentioned Network Downtime, but what about unresponsiveness or services restarted without reboots?
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It is fully possible for a server to physically be online and connected to a network but overloaded/overwhelmed to the point of causing Pingdom to time out and fail. This would be actual downtime (i.e. sites are not working) but logging into the server and checking for outages will show nothing.
Unfortunately if they're going to rely upon the uptime as reported by the OS for any credits/refunds then you're going to be SOL even with super terrible providers because usually the servers are ONLINE, they're just not properly managed and/or are overloaded.