in health_metric_collector/src/sys_info_collector.cpp [41:49]
void SysInfoCollector::AddMetric(const std::string & name, const double value,
const std::string & unit)
{
ros_monitoring_msgs::MetricData md = mgr_.CreateMetric();
md.metric_name = name;
md.unit = unit;
md.value = value;
mgr_.AddMetric(md);
}