sigs.k8s.io/cluster-api@v1.7.1/docs/proposals/images/machine-health-check/mhc.svg

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stroke-width: 1.0;"/><!--MD5=[c76ae935b8891c05edf39b6d46d7784c]
@startuml
start;
:Machine Health Check controller;
repeat
  repeat
    :Watch MHCs;
    :Find unhealthy targets: Need remediation or going towards timeout;
  repeat while (unhealthyTargets > maxUnhealthy) is (yes)
  -> no;
repeat while (API server machine deletion requests for machines that need remediation) is (requeue with minTime to timeout delay)

-[#blue,dashed]-> Out of band;
#LightBlue:The machine owner controller watches deletion timestamp.
Reconciles towards desired number of replicas.
The process to create a new machine/node starts;
#LightBlue:The machine controller drains the unhealthy node;
#LightBlue:The machine controller provider deletes the unhealthy instance;
#LightBlue:The machine controller removes the unhealthy machine finalizer;
#LightBlue:The API server removes the unhealthy machine resource;
@enduml

PlantUML version 1.2019.12(Sun Nov 03 10:24:54 UTC 2019)
(GPL source distribution)
Java Runtime: Java(TM) SE Runtime Environment
JVM: Java HotSpot(TM) 64-Bit Server VM
Java Version: 1.7.0_25-b15
Operating System: Linux
Default Encoding: UTF-8
Language: en
Country: US
--></g></svg>