frontline feedback; voices from the ground
Refers to opinions, complaints, or suggestions from people directly involved in a situation, such as employees, customers, or residents, as opposed to managers or outsiders.
When developing a new service, it's important to listen to feedback from the front lines.
The company president regularly visits stores to gather voices from the ground.
声 is a general word for voice; 現場の声 is a set phrase meaning frontline feedback.
Compound of 現場 (genba, 'actual place, site, front line') + の (no, possessive particle) + 声 (koe, 'voice'). The phrase is a straightforward combination of its parts.