• A Guide to Monitor Linux Server using Prometheus and Grafana
• Настройка уведомлений по электронной почте Grafana
• Смена "темы"

• Install on Debian or Ubuntu

• Технология Docker

# id=$(docker create grafana/grafana-oss)

# docker cp $id:/etc/grafana/ - > etc_grafana.tar
# tar -xvf etc_grafana.tar -C /etc
  или
# docker cp $id:/etc/grafana/ /etc/grafana/

# docker rm -v $id

# docker run -d -p 3000:3000 -v /etc/grafana:/etc/grafana --name grafana grafana/grafana-oss:7.5.4-ubuntu
  или
# docker run -d -p 3000:3000 -v /etc/grafana:/etc/grafana --name grafana grafana/grafana-oss

# docker update --restart=always grafana

• l:admin p:admin
• http://server.corpX.un:3000
• http://192.168.X.10:3000
• http://10.5.N.100+X:3000

Configuratin/Connections->Data Source->Prometheus 
  URL: http://localhost:9090
       http://192.168.X.10:9090  Если grafana в docker

• Official & community built dashboards

+ Import->Import via grafana.com
    prometheus-node-exporter: 1860
    prometheus-blackbox-exporter: 7587
  Data Source: Prometheus

• !!! Не забыть сохранить !!!
• Лучше в folder1 (понадобится для alert)

+ Create
    Name: router
      Add New Panel
      
        Panel Title: FastEthernet0/0 connection to WAN
          или
        Panel Title: Port-channel1 connection to LAN
        
        Query: A
        
          Metrics: 8*rate(ifInOctets{ifDescr="FastEthernet0/0",instance="router"}[1m])/1000000
            или
          Metrics: rate(ifOutOctets{ifDescr="Port-channel1",instance="router"}[1m])/125000
          
          Legend: in Mbps
        Query: B
        
          Metrics: 8*irate(ifOutOctets{ifDescr="FastEthernet0/0",instance="router"}[1m])/1000000
            или
          Metrics: irate(ifInOctets{ifDescr="Port-channel1",instance="router"}[1m])/125000
          
          Legend: out Mbps

# cat /etc/grafana/grafana.ini

...
[smtp]
enabled = true
host = server.corpX.un:25   #if docker, and may be, better use ip
from_address = grafana@corpX.un
ehlo_identity = server.corpX.un
startTLS_policy = NoStartTLS
...

# service grafana-server restart
  или
# docker restart grafana

Alerting->Notification Channels/Contact points ... 
  userX/Email/userX@isp.un
  student/Email/student@corpX.un

• Можно заменить B на Last Count

Dashboard->Panel (name)->Edit->Alert->...->
  Evaluate every: 15s For 1m
  WHEN avg() OF query(B,1m,now) IS ABOVE 8
  Send To: userX/student

Apply->Save Dashboard!!!!