log method
Adds a log line (system/logs event).
Implementation
void log(String level, String message, {String target = 'fake'}) {
final e = {
'seq': _logs.length + 1,
'ts': _now(),
'level': level,
'target': target,
'message': message,
};
_logs.add(e);
bus.publish(DomeTopics.systemLogs, EventKinds.logEntry, resource: e);
}