RedisMetricredis.replication.master_link_down_since_seconds
Seconds since link to master is down
Summary
Seconds since the replication link between replica and master went down. Non-zero values indicate ongoing replication failure — the replica cannot connect to or is disconnected from the master. During this period, the replica serves increasingly stale data and does not receive updates. Extended downtime requires investigation into network connectivity, master availability, or authentication issues.
Interface Metrics (3)
Related Insights (2)
Redis replica falling behind master (redis.replication.master_last_io_seconds_ago increasing) continues serving stale cached data with normal hit rates, masking synchronization issues until applications encounter data inconsistencies or master failover fails.
When redis.replication.repl_backlog_size is too small relative to write rate and network latency, replicas require full resync after brief disconnections, causing replication storms and increased master load.