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According to estimation, 2000 bots are needed to support full CQ traffic.
Currently there are 200 bots in the fleet pool. So it should be suffcient
to support 2% traffic.

Bug: 997376
Change-Id: Ic7976aeb95646f8b92e2f66f5f5c4d41461ce87d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2333822Reviewed-by: Ben Pastene <bpastene@chromium.org>
Commit-Queue: Haiyang Pan <hypan@google.com>
Cr-Commit-Position: refs/heads/master@{#795050}