- readiness probe
- kitematic
- logstats https://www.elastic.co/guide/kr/logstash/current/getting-started-with-logstash.html
- upgrade without down time
- add worker or proxy or master
- liveness
- image gc https://kubernetes.io/docs/concepts/workloads/controllers/garbage-collection/
- host group
- etcd / mongo db
- SAML https://www-03preprod.ibm.com/support/knowledgecenter/SSBS6K_3.1.0/user_management/saml.html