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Feature Idea: Additional control over "Outlier" NRQL alerts


#1

Right now, outlier alerts detect if along these lines (pseudo-phrased): “If there are any violations of this alert criteria, as an outlier to the trend of the query results, for at least this long, trigger an alert.”

Suppose this NRQL query is something like this (we use several variations of this general approach):
“select average(duration) from transaction where appName=‘myAppName’ facet host”
And suppose I have it set as an outlier with a particular threshold.
This configuration will detect (properly) if a single server goes bad and has a wildly different response time from the rest of the servers in the group.

The problem is that if there are several servers that get performance “spikes” lasting only a minute or so, then it will be attributed as “there were at least one outlier at all times during the threshold of this condition, so fire the alert”. But that’s not what we want – we want to only trigger on individual hosts that are outliers, not the fact that the group as a whole does have many outlier blips.

To solve this issue, I propose having an additional setting to configure whether the outlier alert condition is looking for Group Outlier (which is the current functionality), or Instance Outlier (which looks for single outliers).

Thanks,

Kevin


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#2

Hey @kwhite - thanks for posting your Feature Idea here. I’ve gone ahead adding a feature idea poll to your post, and I have filed an internal feature request here.