Tweak the metrics to support computing uptime using avg_over_time

Change-Id: I086784a15d621ff8cf401c1d4621bd618fdfe733
3 files changed
tree: 2e7f7da4de0b0044a0151e057c7a137b15b306cf
  1. .gitreview
  2. edge-monitoring/
  3. slack-notifier/