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StatsD (statsd)

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Full detail: Where this data comes from

StatsD is the network daemon and UDP-based line protocol for application metrics, originally written at Etsy and now maintained at github.com/statsd/statsd. A StatsD client emits short text packets — counters, gauges, timers, histograms, sets, and meters — to a daemon that aggregates them in memory and flushes derived series to a backend such as Graphite, InfluxDB, Datadog, CloudWatch, or any of 30+ third-party sinks. The wire format is the canonical contract; dozens of language clients and several alternative servers (DogStatsD, Telegraf, gostatsd, brubeck, statsite, Veneur, bioyino) speak it with small, well-documented dialect extensions for tags, histograms, events, and service checks.

APIs.json: https://raw.githubusercontent.com/api-evangelist/statsd/refs/heads/main/apis.yml

Scope

  • Type: Index

Tags

  • Aggregation
  • Daemon
  • DogStatsD
  • Line Protocol
  • Metrics
  • Observability
  • Open Source
  • StatsD
  • TCP
  • UDP
  • Wire Protocol

Timestamps

  • Created: 2024-01-01
  • Modified: 2026-05-23

APIs

StatsD Wire Protocol

The StatsD wire protocol is a UTF-8, line-oriented, UDP-by-default packet format used to push application metrics from clients to a StatsD daemon. Each line takes the form bucket:value|type[|@sample_rate], where type is one of c (counter), g (gauge, with optional +/- for delta), ms (timer), h (histogram), s (set), or m (meter, in some dialects). Multiple metrics may share a packet when separated by \n. The protocol is connectionless on UDP (port 8125) and connection-oriented on TCP, where each metric MUST be terminated by \n. The wire format is the canonical contract between StatsD, its tag-aware dialects (DogStatsD, InfluxDB, SignalFx), and the wider ecosystem of clients and servers.

Tags

  • Counters
  • Gauges
  • Histograms
  • Line Protocol
  • Meters
  • Metrics
  • Sets
  • Timers
  • UDP
  • Wire Protocol

Properties

StatsD Admin Interface

The StatsD admin/management interface is a plain-text TCP service exposed on port 8126 (default), used to inspect daemon state and clear in-memory aggregates. Supported commands are stats, counters, gauges, timers, delcounters, delgauges, deltimers, health [up|down], config, and quit. Each command is line-terminated; the daemon responds with one or more lines of plain text and the command name as a terminator (END). Wildcards (*) are supported on the delete commands. The interface is intended for telnet/netcat-style operator use and for tooling that wants to snapshot counters or toggle health checks.

Tags

  • Admin
  • Health Check
  • Management
  • Operator
  • TCP

Properties

DogStatsD Wire Protocol

DogStatsD is the Datadog Agent's StatsD-compatible ingestion protocol. It is a strict superset of the StatsD wire format that adds first-class tag syntax (|#k:v,k:v), histogram (|h) and distribution (|d) metric types, events (_e{title.len,text.len}:title|text|...), service checks (_sc|name|status|...), and Unix Domain Socket transport in addition to UDP/8125. Wide adoption beyond Datadog itself — Stripe Veneur, Atlassian gostatsd, Telegraf, and Shopify's statsd-instrument all speak DogStatsD — has made it the de facto modern dialect of the StatsD line protocol.

Tags

  • Datadog
  • Distributions
  • DogStatsD
  • Events
  • Histograms
  • Service Checks
  • Tags
  • Unix Domain Socket
  • Wire Protocol

Properties

Common Properties

About

StatsD is the network daemon and UDP-based line protocol for application metrics, originally written at Etsy and now maintained at github.com/statsd/statsd. A StatsD client emits short text packets — counters, gauges, timers, histograms, sets, and meters — to a daemon that aggregates them in memory and flushes derived series to a backend such as…

Topics

aggregationapis-jsondaemondogstatsdline-protocolmetricsobservabilityopen-sourcestatsdtcpudpwire-protocol

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