In order to save your user’s battery and bandwidth, you may want that not all devices send logs by default. Here is how:
Press the “Enable all devices” toggle button. This will disable all by default.
Later on you can enable specific devices when you know there’s a problem:
The first logs you will receive are the data cached in the device (by default 5MB but it can be more/less depending on your configuration) and after that you will keep receiving the current data as it happens (with a ~30 second delay).