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README.md

Redis Input Plugin

The Redis input plugin gathers metrics from one or many Redis servers.

Global configuration options

In addition to the plugin-specific configuration settings, plugins support additional global and plugin configuration settings. These settings are used to modify metrics, tags, and field or create aliases and configure ordering, etc. See the CONFIGURATION.md for more details.

Configuration

# Read metrics from one or many redis servers
[[inputs.redis]]
  ## specify servers via a url matching:
  ##  [protocol://][username:password]@address[:port]
  ##  e.g.
  ##    tcp://localhost:6379
  ##    tcp://username:password@192.168.99.100
  ##    unix:///var/run/redis.sock
  ##
  ## If no servers are specified, then localhost is used as the host.
  ## If no port is specified, 6379 is used
  servers = ["tcp://localhost:6379"]

  ## Optional. Specify redis commands to retrieve values
  # [[inputs.redis.commands]]
  #   # The command to run where each argument is a separate element
  #   command = ["get", "sample-key"]
  #   # The field to store the result in
  #   field = "sample-key-value"
  #   # The type of the result
  #   # Can be "string", "integer", or "float"
  #   type = "string"

  ## Specify username and password for ACL auth (Redis 6.0+). You can add this
  ## to the server URI above or specify it here. The values here take
  ## precedence.
  # username = ""
  # password = ""

  ## Optional TLS Config
  ## Check tls/config.go ClientConfig for more options
  # tls_enable = true
  # 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

Metrics

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)

      Persistence

    • 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 could have the following fields:

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

  • redis_latency_percentiles_usec

    • fields:
      • p50(float, microseconds)
      • p99(float, microseconds)
      • p99.9(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)

  • redis_errorstat

    • tags:
      • err
    • fields:
      • total (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 command tag:

    • command

  • The redis_latency_percentiles_usec measurement has an additional command 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://:password@192.168.99.100
  ##
  ## 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:

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=569514i,failed_calls=0i,rejected_calls=0i,usec=9916334i,usec_per_call=17.41 1559227136000000000

redis_latency_percentiles_usec:

redis_latency_percentiles_usec,command=zadd,host=host,port=6379,replication_role=master,server=localhost p50=9.023,p99=28.031,p99.9=43.007 1559227136000000000

redis_error:

redis_errorstat,err=MOVED,host=host,port=6379,replication_role=master,server=localhost total=4284 1691119309000000000