Monitoring
Tranditional monitoring is for Datacenter, like nagios, zabbix.
Modern monitoring is for Cloud and Container.
Modern monitoring based on metrics, logs and tracing.
现代的监控系统在DevOps的基础上，除了传统的metrics和logging的采集，还需要tracing应用。
metrics
TICK stack
influxdb: tsdb.
kapacitor: alerting.
chronograf: GUI.
telegraf(agent): metrics collector.
Prometheus
Graphing
最流行的监控绘图软件是grafana, 支持influxdb,elasticsearch和prometheus.