in health_metric_collector/src/metric_manager.cpp [24:32]
MetricData MetricManager::CreateMetric() const
{
MetricData md;
// FIXME use builtin_interfaces.msg.time and node->now()
md.header.stamp = node_->now();
md.time_stamp = md.header.stamp;
md.dimensions = dimensions_.dimensions;
return md;
}