validation_pool: reduce the throttling backoff lookback threshold

If we start failing a lot of runs in a row, the exponential backoff of
CLs picked up gets so agressive as to make the CQ basically useless.

Reduce the history lookback so that this is less aggressive.


Change-Id: I4de48194630e4893969bff3ebc18583e31dd3e0e
Commit-Queue: Aviv Keshet <>
Tested-by: Aviv Keshet <>
Trybot-Ready: Aviv Keshet <>
Reviewed-by: Ningning Xia <>
1 file changed