resolve merge conflicts of 0f97b8f to nyc-mr1-dev
am: 5b3b72e7b7

* commit '5b3b72e7b7a926ac954db23c2ceaf10aa9b32539':
  add metrics for notification and group expansion

Change-Id: I2df2f6e2ba27e4368162ce0642c77ec0a559620e