CellBroadcast metrics improvement

- Monitor the deployment and usage of the module
- Measure the health and detect potential issues
- Diagnose and estimate the loss if the issue happens

Bug: 220938704
Test: build pass
Test: statsd_testdrive 249
Test: statsd_testdrive 250
Test: statsd_testdrive 278
Test: statsd_testdrive 479
Test: statsd_testdrive 480
Test: statsd_testdrive 481
Test: statsd_testdrive 482

Change-Id: I4d99df44b29d10417bfcd7a4dcfed3e383bb2868
(cherry picked from commit 41ed206fbaafd39ff56828dcc01790a45456de7b)
Merged-In: I4d99df44b29d10417bfcd7a4dcfed3e383bb2868
1 file changed
tree: 0756980201f083c71538140fb43c73221dc0ac3d
  1. stats/
  2. OWNERS