redis

README

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://][:password]@address[:port]
  ##  e.g.
  ##    tcp://localhost:6379
  ##    tcp://: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 server password
  # password = "s#cr@t%"

  ## specify username for ACL auth (Redis 6.0+)
  # username = "default"

  ## 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

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 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://: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:

* 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

Documentation

Index

• Variables
• type Client
• type Redis
  • func (r *Redis) Gather(acc telegraf.Accumulator) error
  • func (r *Redis) Init() error
  • func (*Redis) SampleConfig() string
  • func (r *Redis) Start(telegraf.Accumulator) error
  • func (r *Redis) Stop()
• type RedisClient
  • func (r *RedisClient) BaseTags() map[string]string
  • func (r *RedisClient) Close() error
  • func (r *RedisClient) Do(returnType string, args ...interface{}) (interface{}, error)
  • func (r *RedisClient) Info() *redis.StringCmd
• type RedisCommand
• type RedisFieldTypes

Variables

var Tracking = map[string]string{
	"uptime_in_seconds": "uptime",
	"connected_clients": "clients",
	"role":              "replication_role",
}

Types

type Client

type Client interface {
	Do(returnType string, args ...interface{}) (interface{}, error)
	Info() *redis.StringCmd
	BaseTags() map[string]string
	Close() error
}

type Redis

type Redis struct {
	Commands []*RedisCommand
	Servers  []string
	Username string
	Password string
	tls.ClientConfig

	Log telegraf.Logger `toml:"-"`
	// contains filtered or unexported fields
}

func (*Redis) Gather

func (r *Redis) Gather(acc telegraf.Accumulator) error

Reads stats from all configured servers accumulates stats. Returns one of the errors encountered while gather stats (if any).

func (*Redis) Init

func (r *Redis) Init() error

func (*Redis) SampleConfig

func (*Redis) SampleConfig() string

func (*Redis) Start

func (r *Redis) Start(telegraf.Accumulator) error

func (*Redis) Stop

func (r *Redis) Stop()

Stop close the client through ServiceInput interface Start/Stop methods impl.

type RedisClient

type RedisClient struct {
	// contains filtered or unexported fields
}

func (*RedisClient) BaseTags

func (r *RedisClient) BaseTags() map[string]string

func (*RedisClient) Close

func (r *RedisClient) Close() error

func (*RedisClient) Do

func (r *RedisClient) Do(returnType string, args ...interface{}) (interface{}, error)

func (*RedisClient) Info

func (r *RedisClient) Info() *redis.StringCmd

type RedisCommand

type RedisCommand struct {
	Command []interface{}
	Field   string
	Type    string
}

type RedisFieldTypes

type RedisFieldTypes struct {
	ActiveDefragHits            int64   `json:"active_defrag_hits"`
	ActiveDefragKeyHits         int64   `json:"active_defrag_key_hits"`
	ActiveDefragKeyMisses       int64   `json:"active_defrag_key_misses"`
	ActiveDefragMisses          int64   `json:"active_defrag_misses"`
	ActiveDefragRunning         int64   `json:"active_defrag_running"`
	AllocatorActive             int64   `json:"allocator_active"`
	AllocatorAllocated          int64   `json:"allocator_allocated"`
	AllocatorFragBytes          float64 `json:"allocator_frag_bytes"` // for historical reasons this was left as float although redis reports it as an int
	AllocatorFragRatio          float64 `json:"allocator_frag_ratio"`
	AllocatorResident           int64   `json:"allocator_resident"`
	AllocatorRssBytes           int64   `json:"allocator_rss_bytes"`
	AllocatorRssRatio           float64 `json:"allocator_rss_ratio"`
	AofCurrentRewriteTimeSec    int64   `json:"aof_current_rewrite_time_sec"`
	AofEnabled                  int64   `json:"aof_enabled"`
	AofLastBgrewriteStatus      string  `json:"aof_last_bgrewrite_status"`
	AofLastCowSize              int64   `json:"aof_last_cow_size"`
	AofLastRewriteTimeSec       int64   `json:"aof_last_rewrite_time_sec"`
	AofLastWriteStatus          string  `json:"aof_last_write_status"`
	AofRewriteInProgress        int64   `json:"aof_rewrite_in_progress"`
	AofRewriteScheduled         int64   `json:"aof_rewrite_scheduled"`
	BlockedClients              int64   `json:"blocked_clients"`
	ClientRecentMaxInputBuffer  int64   `json:"client_recent_max_input_buffer"`
	ClientRecentMaxOutputBuffer int64   `json:"client_recent_max_output_buffer"`
	Clients                     int64   `json:"clients"`
	ClientsInTimeoutTable       int64   `json:"clients_in_timeout_table"`
	ClusterEnabled              int64   `json:"cluster_enabled"`
	ConnectedSlaves             int64   `json:"connected_slaves"`
	EvictedKeys                 int64   `json:"evicted_keys"`
	ExpireCycleCPUMilliseconds  int64   `json:"expire_cycle_cpu_milliseconds"`
	ExpiredKeys                 int64   `json:"expired_keys"`
	ExpiredStalePerc            float64 `json:"expired_stale_perc"`
	ExpiredTimeCapReachedCount  int64   `json:"expired_time_cap_reached_count"`
	InstantaneousInputKbps      float64 `json:"instantaneous_input_kbps"`
	InstantaneousOpsPerSec      int64   `json:"instantaneous_ops_per_sec"`
	InstantaneousOutputKbps     float64 `json:"instantaneous_output_kbps"`
	IoThreadedReadsProcessed    int64   `json:"io_threaded_reads_processed"`
	IoThreadedWritesProcessed   int64   `json:"io_threaded_writes_processed"`
	KeyspaceHits                int64   `json:"keyspace_hits"`
	KeyspaceMisses              int64   `json:"keyspace_misses"`
	LatestForkUsec              int64   `json:"latest_fork_usec"`
	LazyfreePendingObjects      int64   `json:"lazyfree_pending_objects"`
	Loading                     int64   `json:"loading"`
	LruClock                    int64   `json:"lru_clock"`
	MasterReplOffset            int64   `json:"master_repl_offset"`
	MaxMemory                   int64   `json:"maxmemory"`
	MaxMemoryPolicy             string  `json:"maxmemory_policy"`
	MemAofBuffer                int64   `json:"mem_aof_buffer"`
	MemClientsNormal            int64   `json:"mem_clients_normal"`
	MemClientsSlaves            int64   `json:"mem_clients_slaves"`
	MemFragmentationBytes       int64   `json:"mem_fragmentation_bytes"`
	MemFragmentationRatio       float64 `json:"mem_fragmentation_ratio"`
	MemNotCountedForEvict       int64   `json:"mem_not_counted_for_evict"`
	MemReplicationBacklog       int64   `json:"mem_replication_backlog"`
	MigrateCachedSockets        int64   `json:"migrate_cached_sockets"`
	ModuleForkInProgress        int64   `json:"module_fork_in_progress"`
	ModuleForkLastCowSize       int64   `json:"module_fork_last_cow_size"`
	NumberOfCachedScripts       int64   `json:"number_of_cached_scripts"`
	PubsubChannels              int64   `json:"pubsub_channels"`
	PubsubPatterns              int64   `json:"pubsub_patterns"`
	RdbBgsaveInProgress         int64   `json:"rdb_bgsave_in_progress"`
	RdbChangesSinceLastSave     int64   `json:"rdb_changes_since_last_save"`
	RdbCurrentBgsaveTimeSec     int64   `json:"rdb_current_bgsave_time_sec"`
	RdbLastBgsaveStatus         string  `json:"rdb_last_bgsave_status"`
	RdbLastBgsaveTimeSec        int64   `json:"rdb_last_bgsave_time_sec"`
	RdbLastCowSize              int64   `json:"rdb_last_cow_size"`
	RdbLastSaveTime             int64   `json:"rdb_last_save_time"`
	RdbLastSaveTimeElapsed      int64   `json:"rdb_last_save_time_elapsed"`
	RedisVersion                string  `json:"redis_version"`
	RejectedConnections         int64   `json:"rejected_connections"`
	ReplBacklogActive           int64   `json:"repl_backlog_active"`
	ReplBacklogFirstByteOffset  int64   `json:"repl_backlog_first_byte_offset"`
	ReplBacklogHistlen          int64   `json:"repl_backlog_histlen"`
	ReplBacklogSize             int64   `json:"repl_backlog_size"`
	RssOverheadBytes            int64   `json:"rss_overhead_bytes"`
	RssOverheadRatio            float64 `json:"rss_overhead_ratio"`
	SecondReplOffset            int64   `json:"second_repl_offset"`
	SlaveExpiresTrackedKeys     int64   `json:"slave_expires_tracked_keys"`
	SyncFull                    int64   `json:"sync_full"`
	SyncPartialErr              int64   `json:"sync_partial_err"`
	SyncPartialOk               int64   `json:"sync_partial_ok"`
	TotalCommandsProcessed      int64   `json:"total_commands_processed"`
	TotalConnectionsReceived    int64   `json:"total_connections_received"`
	TotalNetInputBytes          int64   `json:"total_net_input_bytes"`
	TotalNetOutputBytes         int64   `json:"total_net_output_bytes"`
	TotalReadsProcessed         int64   `json:"total_reads_processed"`
	TotalSystemMemory           int64   `json:"total_system_memory"`
	TotalWritesProcessed        int64   `json:"total_writes_processed"`
	TrackingClients             int64   `json:"tracking_clients"`
	TrackingTotalItems          int64   `json:"tracking_total_items"`
	TrackingTotalKeys           int64   `json:"tracking_total_keys"`
	TrackingTotalPrefixes       int64   `json:"tracking_total_prefixes"`
	UnexpectedErrorReplies      int64   `json:"unexpected_error_replies"`
	Uptime                      int64   `json:"uptime"`
	UsedCPUSys                  float64 `json:"used_cpu_sys"`
	UsedCPUSysChildren          float64 `json:"used_cpu_sys_children"`
	UsedCPUUser                 float64 `json:"used_cpu_user"`
	UsedCPUUserChildren         float64 `json:"used_cpu_user_children"`
	UsedMemory                  int64   `json:"used_memory"`
	UsedMemoryDataset           int64   `json:"used_memory_dataset"`
	UsedMemoryDatasetPerc       float64 `json:"used_memory_dataset_perc"`
	UsedMemoryLua               int64   `json:"used_memory_lua"`
	UsedMemoryOverhead          int64   `json:"used_memory_overhead"`
	UsedMemoryPeak              int64   `json:"used_memory_peak"`
	UsedMemoryPeakPerc          float64 `json:"used_memory_peak_perc"`
	UsedMemoryRss               int64   `json:"used_memory_rss"`
	UsedMemoryScripts           int64   `json:"used_memory_scripts"`
	UsedMemoryStartup           int64   `json:"used_memory_startup"`
}

RedisFieldTypes defines the types expected for each of the fields redis reports on