# Tracing Tracing system allows developers to visualize call flows in there infrastructures. We use [OpenTracing](http://opentracing.io). It is an open standard designed for distributed tracing. Træfik supports two backends: Jaeger and Zipkin. ## Jaeger ```toml # Tracing definition [tracing] # Backend name used to send tracing data # # Default: "jaeger" # backend = "jaeger" # Service name used in Jaeger backend # # Default: "traefik" # serviceName = "traefik" [tracing.jaeger] # Sampling Server URL is the address of jaeger-agent's HTTP sampling server # # Default: "http://localhost:5778/sampling" # samplingServerURL = "http://localhost:5778/sampling" # Sampling Type specifies the type of the sampler: const, probabilistic, rateLimiting # # Default: "const" # samplingType = "const" # Sampling Param is a value passed to the sampler. # Valid values for Param field are: # - for "const" sampler, 0 or 1 for always false/true respectively # - for "probabilistic" sampler, a probability between 0 and 1 # - for "rateLimiting" sampler, the number of spans per second # # Default: 1.0 # samplingParam = 1.0 # Local Agent Host Port instructs reporter to send spans to jaeger-agent at this address # # Default: "127.0.0.1:6831" # localAgentHostPort = "127.0.0.1:6831" ``` !!! warning Træfik is only able to send data over compact thrift protocol to the [Jaeger agent](https://www.jaegertracing.io/docs/deployment/#agent). ## Zipkin ```toml # Tracing definition [tracing] # Backend name used to send tracing data # # Default: "jaeger" # backend = "zipkin" # Service name used in Zipkin backend # # Default: "traefik" # serviceName = "traefik" [tracing.zipkin] # Zipking HTTP endpoint used to send data # # Default: "http://localhost:9411/api/v1/spans" # httpEndpoint = "http://localhost:9411/api/v1/spans" # Enable Zipkin debug # # Default: false # debug = false # Use ZipKin SameSpan RPC style traces # # Default: false # sameSpan = false # Use ZipKin 128 bit root span IDs # # Default: true # id128Bit = true ``` ## DataDog ```toml # Tracing definition [tracing] # Backend name used to send tracing data # # Default: "jaeger" # backend = "datadog" # Service name used in DataDog backend # # Default: "traefik" # serviceName = "traefik" [tracing.datadog] # Local Agent Host Port instructs reporter to send spans to datadog-tracing-agent at this address # # Default: "127.0.0.1:8126" # localAgentHostPort = "127.0.0.1:8126" # Enable DataDog debug # # Default: false # debug = false # Apply shared tag in a form of Key:Value to all the traces # # Default: "" # globalTag = "" ```