Top memory keys

Sample keys ranked by actual memory usage, not element count; finds RAM hogs

redis-cli --memkeys

More redis commands

Exact key memory

redis-cli MEMORY USAGE <name> SAMPLES 0

Bytes used by a single key incl overhead; SAMPLES 0 = exact for collections
Slowlog inspection

redis-cli SLOWLOG GET 10; redis-cli SLOWLOG RESET

List 10 slowest commands with args and duration, then clear the log
Latency root-cause advice

redis-cli LATENCY DOCTOR

Human-readable latency analysis with likely causes; pair with LATENCY HISTORY <event>
Oldest idle clients

redis-cli CLIENT LIST | tr ' ' '\n' | grep -E 'addr=|age=|idle=' | paste - - - | sort -t= -k3 -rn | head

Find long-lived/idle connections leaking sockets; sort by age then idle
Cluster health check

redis-cli --cluster check <host>:<port>

Verify slot coverage, node consistency and open slots across the cluster