cmccabe commented on code in PR #19586:
URL: https://github.com/apache/kafka/pull/19586#discussion_r2085194087
##########
metadata/src/main/java/org/apache/kafka/controller/QuorumController.java:
##########
@@ -1781,6 +1782,7 @@ public CompletableFuture<Void> unregisterBroker(
ControllerRequestContext context,
int brokerId
) {
+ controllerMetrics.removeTimeSinceLastHeartbeatMetric(brokerId);
Review Comment:
In order to prevent the wrong thing getting unregistered, it seems like we
should check the broker epoch here.
##########
metadata/src/main/java/org/apache/kafka/controller/QuorumController.java:
##########
@@ -1928,6 +1930,7 @@ public CompletableFuture<BrokerHeartbeatReply>
processBrokerHeartbeat(
ControllerRequestContext context,
BrokerHeartbeatRequestData request
) {
+ controllerMetrics.updateBrokerContactTime(request.brokerId());
Review Comment:
This should include the broker epoch
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