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Telegraf Plugin: Redis

Configuration:

# Read Redis's basic status information
[[inputs.redis]]
  ## specify servers via a url matching:
  ##  [protocol://][:password]@address[:port]
  ##  e.g.
  ##    tcp://localhost:6379
  ##    tcp://:[email protected]
  ##
  ## If no servers are specified, then localhost is used as the host.
  ## If no port is specified, 6379 is used
  servers = ["tcp://localhost:6379"]

  ## specify server password
  # password = "s#cr@t%"

  ## Optional TLS Config
  # tls_ca = "/etc/telegraf/ca.pem"
  # tls_cert = "/etc/telegraf/cert.pem"
  # tls_key = "/etc/telegraf/key.pem"
  ## Use TLS but skip chain & host verification
  # insecure_skip_verify = true

Measurements & Fields:

The plugin gathers the results of the INFO redis command. There are two separate measurements: redis and redis_keyspace, the latter is used for gathering database related statistics.

Additionally the plugin also calculates the hit/miss ratio (keyspace_hitrate) and the elapsed time since the last rdb save (rdb_last_save_time_elapsed).

  • redis

    • keyspace_hitrate(float, number)
    • rdb_last_save_time_elapsed(int, seconds)

    Server

    • uptime(int, seconds)
    • lru_clock(int, number)
    • redis_version(string)

    Clients

    • clients(int, number)
    • client_longest_output_list(int, number)
    • client_biggest_input_buf(int, number)
    • blocked_clients(int, number)

    Memory

    • used_memory(int, bytes)
    • used_memory_rss(int, bytes)
    • used_memory_peak(int, bytes)
    • total_system_memory(int, bytes)
    • used_memory_lua(int, bytes)
    • maxmemory(int, bytes)
    • maxmemory_policy(string)
    • mem_fragmentation_ratio(float, number)

    Persistance

    • loading(int,flag)
    • rdb_changes_since_last_save(int, number)
    • rdb_bgsave_in_progress(int, flag)
    • rdb_last_save_time(int, seconds)
    • rdb_last_bgsave_status(string)
    • rdb_last_bgsave_time_sec(int, seconds)
    • rdb_current_bgsave_time_sec(int, seconds)
    • aof_enabled(int, flag)
    • aof_rewrite_in_progress(int, flag)
    • aof_rewrite_scheduled(int, flag)
    • aof_last_rewrite_time_sec(int, seconds)
    • aof_current_rewrite_time_sec(int, seconds)
    • aof_last_bgrewrite_status(string)
    • aof_last_write_status(string)

    Stats

    • total_connections_received(int, number)
    • total_commands_processed(int, number)
    • instantaneous_ops_per_sec(int, number)
    • total_net_input_bytes(int, bytes)
    • total_net_output_bytes(int, bytes)
    • instantaneous_input_kbps(float, KB/sec)
    • instantaneous_output_kbps(float, KB/sec)
    • rejected_connections(int, number)
    • sync_full(int, number)
    • sync_partial_ok(int, number)
    • sync_partial_err(int, number)
    • expired_keys(int, number)
    • evicted_keys(int, number)
    • keyspace_hits(int, number)
    • keyspace_misses(int, number)
    • pubsub_channels(int, number)
    • pubsub_patterns(int, number)
    • latest_fork_usec(int, microseconds)
    • migrate_cached_sockets(int, number)

    Replication

    • connected_slaves(int, number)
    • master_link_down_since_seconds(int, number)
    • master_link_status(string)
    • master_repl_offset(int, number)
    • second_repl_offset(int, number)
    • repl_backlog_active(int, number)
    • repl_backlog_size(int, bytes)
    • repl_backlog_first_byte_offset(int, number)
    • repl_backlog_histlen(int, bytes)

    CPU

    • used_cpu_sys(float, number)
    • used_cpu_user(float, number)
    • used_cpu_sys_children(float, number)
    • used_cpu_user_children(float, number)

    Cluster

    • cluster_enabled(int, flag)

  • redis_keyspace

    • keys(int, number)
    • expires(int, number)
    • avg_ttl(int, number)

  • redis_cmdstat Every Redis used command will have 3 new fields:

    • calls(int, number)
    • usec(int, mircoseconds)
    • usec_per_call(float, microseconds)

  • redis_replication

    • tags:

      • replication_role
      • replica_ip
      • replica_port
      • state (either "online", "wait_bgsave", or "send_bulk")

    • fields:

      • lag(int, number)
      • offset(int, number)

Tags:

  • All measurements have the following tags:

    • port
    • server
    • replication_role

  • The redis_keyspace measurement has an additional database tag:

    • database

  • The redis_cmdstat measurement has an additional tag:

    • command

Example Output:

Using this configuration:

[[inputs.redis]]
  ## specify servers via a url matching:
  ##  [protocol://][:password]@address[:port]
  ##  e.g.
  ##    tcp://localhost:6379
  ##    tcp://:[email protected]
  ##
  ## If no servers are specified, then localhost is used as the host.
  ## If no port is specified, 6379 is used
  servers = ["tcp://localhost:6379"]

When run with:

./telegraf --config telegraf.conf --input-filter redis --test

It produces:

* Plugin: redis, Collection 1
> redis,server=localhost,port=6379,replication_role=master,host=host keyspace_hitrate=1,clients=2i,blocked_clients=0i,instantaneous_input_kbps=0,sync_full=0i,pubsub_channels=0i,pubsub_patterns=0i,total_net_output_bytes=6659253i,used_memory=842448i,total_system_memory=8351916032i,aof_current_rewrite_time_sec=-1i,rdb_changes_since_last_save=0i,sync_partial_err=0i,latest_fork_usec=508i,instantaneous_output_kbps=0,expired_keys=0i,used_memory_peak=843416i,aof_rewrite_in_progress=0i,aof_last_bgrewrite_status="ok",migrate_cached_sockets=0i,connected_slaves=0i,maxmemory_policy="noeviction",aof_rewrite_scheduled=0i,total_net_input_bytes=3125i,used_memory_rss=9564160i,repl_backlog_histlen=0i,rdb_last_bgsave_status="ok",aof_last_rewrite_time_sec=-1i,keyspace_misses=0i,client_biggest_input_buf=5i,used_cpu_user=1.33,maxmemory=0i,rdb_current_bgsave_time_sec=-1i,total_commands_processed=271i,repl_backlog_size=1048576i,used_cpu_sys=3,uptime=2822i,lru_clock=16706281i,used_memory_lua=37888i,rejected_connections=0i,sync_partial_ok=0i,evicted_keys=0i,rdb_last_save_time_elapsed=1922i,rdb_last_save_time=1493099368i,instantaneous_ops_per_sec=0i,used_cpu_user_children=0,client_longest_output_list=0i,master_repl_offset=0i,repl_backlog_active=0i,keyspace_hits=2i,used_cpu_sys_children=0,cluster_enabled=0i,rdb_last_bgsave_time_sec=0i,aof_last_write_status="ok",total_connections_received=263i,aof_enabled=0i,repl_backlog_first_byte_offset=0i,mem_fragmentation_ratio=11.35,loading=0i,rdb_bgsave_in_progress=0i 1493101290000000000

redis_keyspace:

> redis_keyspace,database=db1,host=host,server=localhost,port=6379,replication_role=master keys=1i,expires=0i,avg_ttl=0i 1493101350000000000

redis_command:

> redis_cmdstat,command=publish,host=host,port=6379,replication_role=master,server=localhost calls=68113i,usec=325146i,usec_per_call=4.77 1559227136000000000