No data was collected in volation of the Fourth Amendment.
No actual data was collected. Metadata apparently is not data (in agency speak anyhow) it only becomes data when a human actually looks at it (A bit like Schrödinger's cat - Who knew that Government workers had applied Quantum superposition in their daily jobs, to avoid going to jail).
So now it is time for plan B - For the agencies to hire Monkeys with Mind-Reading Brain Scanners. This is so that no human will have looked at the actual metadata, and converted it into data, and the Fourth Amendment will still have it's full virginity.