docs: strongly consistent SHOW INSTANCES and request forwarding - #1709
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Document memgraph/memgraph#4492: - SHOW INSTANCES is now always answered by the leader coordinator. A follower that cannot reach the leader returns an empty result set with a LeaderNotReachable warning instead of falling back to its local Raft state with "unknown" health. A down data instance now reports the role recorded in the Raft log. - YIELD LEADERSHIP and SHOW COORDINATOR SETTINGS are forwarded to the leader, so they can be run on any coordinator. - SHOW REPLICATION LAG reports why the lag is unavailable via ReplicationLagUnavailable. - ADD COORDINATOR, REMOVE COORDINATOR and UPDATE CONFIG fail with an explicit "coordinator is not a leader" error. Adds a new "When there is no leader to serve the query" error handling section, the ShowCoordSettingsRpc / YieldLeadershipRpc entries, and v3.13.0 release notes.
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Release note
Documented improvements around HA forwarding.
Related product PRs
PRs from product repo this doc page is related to:
memgraph/memgraph#4492
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bugfixorfeaturelabel, based on the product PR type you're documenting