Add 4 sec / 8 sec to the Apdex threshold dropdown
Some APIs are slower than others but it doesn't mean that they give a bad experience to the client.
An API which has a response time of 5sec by design, currently shows up with red bars on the monitors page which is bad to show on a customer facing monitor page.

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TestingSmartIP commented
Sounds good. I proposed 5sec just as an example, but 4 and 8 sec selections would be great.
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Numbers like 5 sec will never be added because it needs to be a power of two (this is because we need to store the number of requests under ApdexT and ApdexT*4, so using power of 2 allows to reuse more numbers). So the next values that could be added without causing too much overhead are 4s and 8s. I'll update this suggestion to reflect this and leave it open to measure the interest.