[networking] Add TCP connections metrics and reports.

1. total TCP connections established at the end of every period
2. TCP connections that got closed in a period
3. TCP connections that got reset in a period
4. TCP connections that got timed out in a period

Bug: 42090

Change-Id: I7b23c306cdf5d9fa980db1067df5c8ead41a3d69
1 file changed
tree: 37fd185bf43012de8463530d9e3b5e83d47268f4
  1. .gitignore
  2. BUILD.gn
  3. OWNERS
  4. check.py
  5. cobalt_internal/
  6. fuchsia/
  7. projects.yaml