This change introduces the `DefaultNetworkRematchMetrics`
class to collect and log data about default network reassignments.
The primary motivation is to monitor the behavior of satellite
networks when they act as a default network fallback. This class
records an event whenever a default network request with the
`PREFERENCE_ORDER_SATELLITE_FALLBACK` preference is moved from
one network to another.
For each reassignment, a `DEFAULT_NETWORK_REMATCH` atom is logged
to ConnectivityStatsLog. This atom includes detailed `NetworkDescription`
protos for the old and new networks, capturing their transport
types, capabilities, and metered/validated states. It also logs
the duration the device spent on the previous network.
Sample metrics:
event_metrics {
data {
aggregated_atom_info {
atom {
default_network_rematch {
session_id: 1099094483789245667
rematch_reason: RMR_UNKNOWN
default_network_rematch_info_list {
default_network_rematch_info {
old_network {
transport_types: 1
metered_state: METERED_YES
validated_state: VS_VALID
score_policies: -4575657221408423932
capabilities: 137711448064
enterprise_id: 0
}
time_duration_on_old_network_sec: 9
uid_ranges {
uid_range {
begin: 10137
end: 10137
}
}
}
}
}
}
elapsed_timestamp_nanos: 73821951490
}
}
}
Test: atest ConnectivityCoverageTests:android.net.connectivity.com.android.metrics.DefaultNetworkRematchMetricsTest \
--update-device
Test: Manual:
1. Change code to use TRANSPORT_CELLULAR
2. m statsd_testdrive && statsd_testdrive -e 525
3. Turn off mobile data.
Flag: EXEMPT controlled by kill switch
Bug: 419123367
Change-Id: I40ba78d81cd30b2dc783e855aa76e776f76ace98
7516d81c87