[autotest] Add some fix to metadata reporter to work better when ES server is down.
1. Email alert when uploading has been failing for over 30min.
2. After uploading has been failing for over 30min, only upload 1 entry at a
time, until upload succeeds again.
BUG=chromium:520761
TEST=local run
Change-Id: Idb7775638a2754a1d6c0d2f0895cdfb8b3673172
Reviewed-on: https://chromium-review.googlesource.com/294105
Trybot-Ready: Dan Shi <dshi@chromium.org>
Tested-by: Dan Shi <dshi@chromium.org>
Reviewed-by: Mungyung Ryu <mkryu@google.com>
Commit-Queue: Dan Shi <dshi@chromium.org>
1 file changed
