Merge branch 'stable-2.13'

* stable-2.13:
  Add metrics for hook execution

Change-Id: I1f4026f3fa96e2a5fa0321d02563f629ffa95fb2
tree: 2a8269813404c08c09b41da2c7159f9d22f6cd8b
  1. .gitignore
  2. BUILD
  3. LICENSE
  4. src/