Make k8s client rate limiter parameters configurable #3848
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Dec 13, 2024
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WHAT
Authored by @tfujiwar - Make k8s client rate limiter parameters configurable.
Original PR: #3833. Moved here to run e2e tests.
WHY
To reduce latency of runner pod creation (#3276).
EphemeralRunnerReconciler requires several k8s API calls until pod creation and those API calls are rate limited by a client library. It would be helpful if users can optimize the rate limiter parameter on their responsibility.
TESTING
We have tested the change with QPS=80 and Burst=120 (4 times higher than the default) while running 50-100 runners and confirmed that the reconcile time of EphemeralRunnerReconciler has decreased from 60 ms to 20 ms.