Add additional fields for mdns advertising

- Add sent_packet_count to record sent packet count before
  unregistered service.
- Add conflict_during_probing_count to record number of conflict
  during probing.
- Add conflict_after_probing_count to record number of conflict
  after probing.
- Add random_number for sampling upload event.

Bug: 287546772
Test: m
Change-Id: Iaff2379615bedc81c4096153f0e682ead6f4db9c
1 file changed
tree: f0d42f62c2f9f623447027e9f43864804a7bd2f8
  1. stats/
  2. OWNERS