How to trigger an alert if the conditions remain for a certain period of time?

[joydeep741]

I have an alert set up, which triggers when page load time > 4.

Now, say the page load time is 5, then I want to trigger the alert if it remains as 5 for the next 15 mins . Is this possible ?

[somesoni2]

How frequent the data is collected and what's the frequency of the alert?

[woodcock]

Save a search like this to run every X minutes for the last 15 minutes (-15m@m) and trigger when the number of results > 0:

... | timechart span=5m avg(pageLoadTime) AS avgPageLoadTime | where avgPageLoadTime > 5 | stats count | where count > 3

Note that count=3 * span=5 is equal to 15 minutes. You can play with these numbers to adjust as you see fit.