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@startuml
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[*] --> NOT_IN_GROUP
NOT_IN_GROUP ---> UNJOINED : Consumer.subscribe()

UNJOINED ---> UNJOINED : Heartbeat on retries
UNJOINED ---> STABLE : Heartbeat, epoch = 0
UNJOINED ---> FATAL

STABLE ---> RECONCILING : new assignment received\ntrigger callbacks
STABLE ---> RECONCILING : Consumer.unsubscribe()
STABLE ---> RELEASING_ASSIGNMENT : on HB fencing error, reset epoch,\ntrigger callbacks
STABLE ---> FATAL
STABLE ---> STABLE : Heartbeat

RECONCILING ---> RECONCILING : Heartbeat
RECONCILING ---> RECONCILIATION_COMPLETE : callback completed
RECONCILIATION_COMPLETE ---> STABLE : Send heartbeat w/ full assignment,\nreset interval timer to\nheartbeat.interval.ms
RECONCILIATION_COMPLETE ---> STABLE : Send heartbeat w/ full assignment,\nreset interval timer to\nheartbeat.interval.ms
RECONCILIATION_COMPLETE ---> UNJOINED : unsubscribe()

RELEASING_ASSIGNMENT ---> RELEASING_ASSIGNMENT_COMPLETE : 'onLost' callback completed
RELEASING_ASSIGNMENT_COMPLETE ---> UNJOINED : Send out-of-interval HB
RELEASING_ASSIGNMENT ---> FATAL

FATAL ---> [*]

@enduml