tree 34b70e11d0d17a5c7a01fce548e7ccfbef764a58
parent 6041a4a24005576ba9dbaa496b33fb96c7472f57
author Chenjie Yu <cjyu@google.com> 1513638934 -0800
committer Chenjie Yu <cjyu@google.com> 1515196199 -0800

pullers now cache data to throttle frequent pull requests.
all pullers have a default 1s cool down before next pull.
We can adjust these later.
Also add puller stats in StatsdStats

Test: unit test
Change-Id: I71894a24c41e059d841591312dbb852f54387b7d