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50aa00b203
It's followup of #15667. This patch is to use zaptest/observer as base to provide a similar function to pkg/expect.Expect. The test env ```bash 11th Gen Intel(R) Core(TM) i5-1135G7 @ 2.40GHz mkdir /sys/fs/cgroup/etcd-followup-15667 echo 0-2 | tee /sys/fs/cgroup/etcd-followup-15667/cpuset.cpus # three cores ``` Before change: * memory.peak: ~ 681 MiB * Elapsed (wall clock) time (h:mm:ss or m:ss): 6:14.04 After change: * memory.peak: ~ 671 MiB * Elapsed (wall clock) time (h:mm:ss or m:ss): 6:13.07 Based on the test result, I think it's safe to be enabled by default. Signed-off-by: Wei Fu <fuweid89@gmail.com>