Vibrations Graph Information
Horizontal lines mark the acceptable vibrations for ArduPilot. If you have a lot of measurements over these ranges you may want to look at various vibration dampening methods. More infomation can be found on the ardupilot website.
It is also worth noting your IMU has been run though the Ramer–Douglas–Peucker algorithm to reduce the number of points plotted, but without lossing the over all shape of the graph
Below are any problems ArduPlotter had whilst processing your log