Merge branch 'stable-3.5' into stable-3.6

* stable-3.5:
  Fix pull-replication plugin startup which was always failing
  Add description for pending tasks metric
  Add description for in_flight metric
  Fixed typo in metric description

Change-Id: Ib8517e700ed248863878e6fa37258a71cbedb8b3
tree: b23543886929cd9b51a1a704989afeb10704f78d
  1. example-setup/
  2. src/
  3. .gitignore
  4. BUILD
  5. Jenkinsfile
  6. LICENSE