Flaky TestAdmissionControl

[AlexanderYastrebov]

TestAdmissionControl fails quite often:

--- FAIL: TestAdmissionControl (7.01s)
    --- FAIL: TestAdmissionControl/small_error_rate_and_bigger_than_threshold_will_block_some_traffic (1.00s)
        admission_test.go:187: ok: 1312.00, fail: 278.00, failBackend: 357.00
        admission_test.go:193: Failed to get expected fails should be in: 61.65 < 278.00 < 256.35

E.g. https://github.com/zalando/skipper/actions/runs/5223927424/jobs/9431473370?pr=2385

[szuecs]

Yeah I wonder why

[MustafaSaber]

I tried to re-produce this go test -v -test.short -race -count 100 -run TestAdmissionControl/small_error_rate_and_bigger_than_threshold_will_block_some_traffic ./filters/shedder

[AlexanderYastrebov]

Related #2319

[AlexanderYastrebov]

--- FAIL: TestAdmissionControl (9.03s)
    --- FAIL: TestAdmissionControl/medium_error_rate_and_bigger_than_threshold_will_block_some_traffic (1.00s)
        admission_test.go:225: ok: 424.00, fail: 465.00, failBackend: 355.00
        admission_test.go:231: Failed to get expected fails should be in: 484.54 < 465.00 < 608.94