Add IpReachabilityMonitor metrics proto.

Bug: 162944199
Test: atest NetworkStackTests
Merged-In: I7479fd5bc2b8150a503bdabf627cf11719e58f3b
Change-Id: I455d8c1fe175946eb72591940a5a55cb21f5819e
2 files changed
tree: 54194651095ee3be7ecc1b3844cc1b5d6f55df2c
  1. stats/
  2. OWNERS