How to collect Redis metrics

The text discusses how to get Redis metrics using the `redis-cli info` command and provides details about various sections such as Server, Stats, Memory, Clients, Persistence, Replication, CPU, Commandstats, Cluster, and Keyspace. It also covers key metrics like instantaneous_ops_per_sec, hit rate, evicted_keys, rejected_connections, keyspace_misses, used_memory, mem_fragmentation_ratio, connected_clients, rdb_last_save_time, rdb_changes_since_last_save, master_link_down_since, connected_slaves, master_last_io_seconds_ago, and keyspace size. Additionally, it explains how to use the slowlog, latency monitor, network latency, intrinsic latency, and latency doctor for diagnosing latency issues in Redis. Finally, it mentions new memory commands added in Redis 4 like memory doctor, memory usage, memory stats, and memory malloc-stats.