As announced via Twitter [1, 2], there was a partial outage wrt. our monitoring/alerting services during yesterday early morning (GMT). Here’s more information: What was affected during the outage? Classic sensors’ results were lost during the incident. Notifications were not triggered until after the incident was corrected. iMacros sensor’s results were not immediately stored during

Did you know? AlertFox allows you to easily export all measurement data in CSV format. This function was available for years, but we expanded its scope, and also made it easier to find: Look for the “Export Sensor’s data” link at the bottom of every report.  

If you are as enthusiastic about computers as we at AlertFox are, you probably know the Raspberry Pi. And if you are as interested in web sites as we at AlertFox are, you probably know WordPress. Now, what would you do if you wanted to host a blog for very little money? Right! You’d run

Measurement Server Software Update

Thursday, 03 July 2014 by

We are about to update our measurement servers. Here’s the new line-up: iMacros 10.00.2738 iMacros “plugin” for Internet Explorer Firefox 29 iMacros for Firefox 8.8.1 Flash Java 7 Update 55 Silverlight 5.1.30214.0 There’s nothing to do on your side. However, if you think you are negatively affected, please contact support.   [Update] All

Database maintenance [Completed]

Wednesday, 18 June 2014 by

We are currently doing some database maintenance. No web performance transaction data will be lost even if historic data is temporarily not available in your account. Alerting is not affected! Update 6:32 pm EST: Maintenance completed – Thank you for your patience. PS: You can also review the status on our Public Status Dashboard – the

Waterfall charts are useful for getting information on very many web site / performance problems. Note that we at AlertFox generate the Waterfall charts  in HAR format using Fiddler which in some cases adds more information to the HAR files than a plain browser HTTP archive would do. To get you started with waterfall charts, we created a

US/EU Round-Robin Retries

Tuesday, 06 May 2014 by

Many of our users appreciate that we have a shared US/EU zone for transaction sensors. Some, however, told us that while a random distribution across the US and EU measurement servers is fine for making sure that customers on both sides of the Atlantic can indeed use their web app or site, it did not

How to Alert on a Group of Sensors

Thursday, 10 April 2014 by

Have you ever wanted to be able to receive an alert if one or more sensors are failing simultaneously? For example, let’s say you have three sensors monitoring some aspect of your site, and each sensor is configured to run in its own region. These sensors will already alert you if there is a problem

Synthetic vs Real User Monitoring

Tuesday, 08 April 2014 by

Let me start out by being honest. It seems every single post about this topic on the web is biased. Synthetic monitoring vendors highlight the advantages of synthetic monitoring, real user monitoring (RUM) vendors point out the advantages of RUM. And vendors that offer both, recommend to use both. At AlertFox we focus on having

Until today, the public dashboard graphs showed our standard performance graphs. But since last year we have the more informative multi-step charts available inside the AlertFox Control Center – and since today our public dashboards display these charts, too. The rule is simple: The standard performance graphs are still used if your transaction test does not contain