The Slow Creep

You hold a service at a constant 2,000 requests per second for 48 hours. Throughput never wavers, but p99 latency drifts from 90 ms to 700 ms, heap usage climbs steadily, and garbage collection pauses lengthen hour over hour. What kind of test is this and what has it found?

A

A spike test, which showed the service cannot absorb a sudden change in arrival rate without degrading

B

A soak test, which held a normal load long enough to expose a slow resource leak that a short run would never surface

C

A stress test, which located the throughput ceiling of the service by holding it under sustained pressure for two days

D

A load test, which showed the cluster is under-provisioned for its target traffic and misses its latency budget