Change the fuchsia_arm64 trybot from a 10% experiment to 50%.
Build times for the arm64 CQ 10% bot experiment over the last 6 days are similar to the existing x64 CQ trybot: builder fuchsia_arm64 fuchsia_x64 builds 487 5109 build_minutes_p50 31.42 24.98 build_minutes_p70 46.82 40.13 build_minutes_p90 56.05 51.45 Stability is good at 10% https://ci.chromium.org/p/chromium/builders/try/fuchsia_arm64 Capacity is also good at 10%. The average number of arm64 bots running at one time at 10% CQ varies from 8 to 15 by day out of 240 bots. Typical spikes are 50 to 60 bots active when a CL build is in progress or 100 to 120 bots active when two CL builds overlap. Pending times at 10% CQ are low. p90 is 2 seconds, p95 is 8 seconds. There is more build time info at https://docs.google.com/spreadsheets/d/1Z_iOiX-9mTDxJrZJri97A-JY-goYkTHlKU4M9EDXLpA There is more pending time info at https://docs.google.com/spreadsheets/d/1YdszSQlLDi5X4Qnakess7YIfSLBu4hzZJ3aZ6cKPFX4 There is more capacity and bot usage info at https://docs.google.com/spreadsheets/d/1Zfn5w9yMB1oINtinS1KMblRbB209YfkqQsHRUKxdk7Q Bug: 1042511 Change-Id: I0b37c7602ddc8fa853dc6e18eeceb2ef396b8e86 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2252634Reviewed-by:Ben Pastene <bpastene@chromium.org> Commit-Queue: Stephen Roe <steveroe@google.com> Cr-Commit-Position: refs/heads/master@{#780329}
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