State changes of data source instances associated with the consumer’s
session. Note that not all data sources may support these notifications.
See |will_notify_on_start/stop| in DataSourceDescriptor.
State change triggered when all data sources are in the STARTED state.
For data sources that registered with |will_notify_on_start| this happens
only after the data source has acked the start. This allows the consumer
to synchronize with the data sources and to perform actions (e.g. start a
test binary) only after trace recording is actually started.
Introduced in Android 11 (R).
When a tracing session has one or more triggers of type CLONE_SNAPSHOT
and a matching trigger is hit, the service will send this notification to
the consumer after |stop_delay_ms|.