A system feature that enables one system entity to signal information to another by modulating its own use of a system resource in such a way as to affect system response time observed by the second entity.
Sources:
CNSSI 4009-2022
from
IETF RFC 4949 Ver 2
NIST SP 800-53 Rev. 5
from
CNSSI 4009-2022 - Adapted