in TwitterLoggingServiceExt/TLSExtDefinitions.h [83:89]
typedef NS_ENUM(uint32_t, tls_os_activity_stream_event_t) {
TLS_OS_ACTIVITY_STREAM_EVENT_STARTED = 1,
TLS_OS_ACTIVITY_STREAM_EVENT_STOPPED = 2,
TLS_OS_ACTIVITY_STREAM_EVENT_FAILED = 3,
TLS_OS_ACTIVITY_STREAM_EVENT_CHUNK_STARTED = 4,
TLS_OS_ACTIVITY_STREAM_EVENT_CHUNK_FINISHED = 5,
};