I can't find the JSON summary file.
In some cases, sessions may end unexpectedly. This could cause the JSON summary file to not get generated. If this happens you can create your JSON file by running the following command:
--generate-json <path_to_session_folder> <target_file>
Why am I not retrieving data for metric X?
For iOS, the collection of certain metrics depend on other metrics. For example; to collect fps, you need to enable collection for fps AND gpu. For cpu, you need to enable collection for cpu AND memory. For network, you need to enable collection for network AND power.