I know there are some examples of data that you can get through the Analytics UI but not through the reporting API, like the User Explorer view.
After digging around a little I have failed to find session quality in the metrics and dimensions -- is this another example of data that is available in the Analytics UI but not in the reporting API? Or is it under another name and I just haven't looked for it the right way?
all the possible reporting API metrics and dimensions are listed at Dimensions & Metrics Explorer so if something is not there then something is not available within API requests . And session quality dimensions and metrics seems not to be there :(