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-- Key SHOW REPLICA STATUS fields: -- Replica_IO_Running: Yes (fetching binlog) -- Replica_SQL_Running: Yes (applying events) -- Seconds_Behind_Source: 0 (no lag) -- Last_Error: "" (no error) -- Performance Schema: SELECT * FROM performance_schema.replication_connection_status\G SELECT * FROM performance_schema.replication_applier_status\G -- Alert on lag > 10s, IO/SQL thread not running, or errors
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