Merge branch 'stable-3.6' into stable-3.7

* stable-3.6:
  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: I04a66d80e6db00bf2d6e7c0000a9c40905f9220c
tree: 1836e441a868140ced08cc50b90da4c7172ed86b
  1. example-setup/
  2. src/
  3. .gitignore
  4. BUILD
  5. Jenkinsfile
  6. LICENSE