After compiling a sketch the IDE will check for storage and memory usage, against the specifications of the selected board. Note that the results are always printed to the console, even if successful.. As long as the use of storage space and dynamic memory usage are both below 100%, the message does not indicate a problem.
Sketch uses 4316 bytes (15%) of program storage space. Maximum is 28672 bytes. Global variables use 153 bytes (5%) of dynamic memory, leaving 2407 bytes for local variables. Maximum is 2560 bytes.
This sketch has a storage space usage of 15% and memory usage of 5%. Both results are well below 100%, and will present no issues.