Hi David
For your custom Metrics , please try changing your metrics by adding "value" at the end
For example, your metric field is
Custom Metrics|WebVitals|LCP
Try using
Custom Metrics|WebVitals|LCP|value
We did extensive work in creating the custom metrics and decided on using this structure. This also will assist you when you want to dashboard a large number of metrics, where you can use a wildcard to show multiple values on the same graph, instead of adding multiple data points per metric. AppD doesn't support wildcarding the last name in the metric tree, hence adding the value at the end.
Also push some load on the endpoint initially, we also had a case where we needed to push some more load than a couple of requests, and after that it worked normally
Ciao
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