Standard deviation problem

I was trying to find something to replace Sumologic's Outlier detection. I thought Standard Deviation might be the answer, but it doesn't look like it's doing what I would expect.

I am trying to find if something has a longer than usual execution time. I would expect to see my values be somewhat near the standard deviation, but instead it's just a line in the center. Is there a better thing I should be using for outlier detection?

If I understand correctly, the kind of outlier detection you are used to is available with the Machine Learning features in one of our paid plans.

Another way of dealing with this is to use a moving average, which is somewhat similar to what the other features are doing. Using a moving average I can see spikes:

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