[v24.2.x] Fix ghost node handling in raft heartbeats #23933
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…ns_test The cluster can't become healthy until ghost nodes are decommissioned. (cherry picked from commit 12bb4ec)
…g node Previously, we replied with "failure", which updated the last heartbeat timestamp and gave the leader an impression that the group is actually there. Reply with group_unavailable, which is more appropriate here. (cherry picked from commit 25541ce)
Usually this is a new node replying to heartbeats addressed to the corresponding ghost node. (cherry picked from commit 1c23c35)
mmaslankaprv
approved these changes
Oct 29, 2024
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Backport of PR #23916
Fixes #23928