Is that on BOTH sides? If so, likely nothing to worry about.
Perhaps the circled release/anti-rattle clip on the front parts, near #11 in this picture.
Older Vs like our '06 had spring-like wires attached to the front pads to hold them off the rotors when the brakes were off, to reduce squeal. They worked OK for the intended purpose, but it was frustrating to change pads, as you needed three hands to hold everything together.