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Comment: Adding mail thread

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Current state: Draft

Discussion thread: https://lists.apache.org/thread/z8cwnksl6op4jfg7j0nwsg9xxsf8mwhhhere [Change the link from the KIP proposal email archive to your own email thread]

JIRA: here [Change the link from KAFKA-1 to your own ticket]

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This KIP will add the following metrics:

NameTypeDescription
kafka.controller:type=KafkaController,name=LongestPendingStartupTimeMsLongThe duration, in milliseconds, of the longest pending broker startup.
kafka.controller:type=KafkaController,name=LongestPendingStartupBrokerStringThe broker ID of the longest pending broker startup.
kafka.controller:type=KafkaController,name=LongestPendingControlledShudownTimeMsLongThe duration, in milliseconds, of the longest pending broker controlled shutdown.
kafka.controller:type=KafkaController,name=LongestPendingControlledShutdownBrokerStringThe broker ID of the longest pending broker controlled shutdown.

Pending broker startup duration: The time between when the controller receives a BrokerRegistration for a brokerID and when the controller processes a BrokerHeartbeat for that broker that causes the broker to be considered "caught up" and unfenced.

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