GlossaryTerms: LA, 16 termsB, 1 termC, 6 termsD, 9 termsE, 4 termsF, 3 termsG, 1 termH, 13 termsI, 13 termsJ, 2 termsKL, 2 termsM, 12 termsNO, 3 termsP, 5 termsQ, 1 termR, 11 termsS, 19 termsT, 5 termsU, 4 termsVW, 7 termsXYZLate heartbeatLate heartbeat is a heartbeat that arrives after the expected time but may still be within grace.LatencyLatency is the delay between starting a request and observing a response milestone.