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After you set up the Rust SDK with your application, you can optionally configure it using the following environment variables.
Unified Service Tagging
It is recommended to use DD_ENV, DD_SERVICE, and DD_VERSION to set env, service, and version for your services.
DD_ENV- Default:
(none)
- Set the application’s environment, for example:
prod, staging. DD_SERVICE- Default:
unnamed-rust-service
- Sets the service name for your application.
DD_VERSION- Default:
(none)
- Set the application’s version, for example:
1.2.3 or 6c44da20. DD_TAGS- Default:
(none)
- A list of default tags to be added to every span, in
key:value format, separated by commas. Example: layer:api,team:intake.
Traces
DD_TRACE_ENABLED- Default:
true
- Set to
false to disable tracing. DD_TRACE_STATS_COMPUTATION_ENABLED- Default:
true
- Enable computation of trace statistics.
DD_TRACE_X_DATADOG_TAGS_MAX_LENGTH- Default:
512
- Maximum length of the
x-datadog-tags header in bytes. DD_TRACE_PARTIAL_FLUSH_ENABLED- Default:
false
- Enable partial flushing of traces.
DD_TRACE_PARTIAL_FLUSH_MIN_SPANS- Default:
300
- Minimum number of spans in a trace before partial flush is triggered.
DD_REMOTE_CONFIGURATION_ENABLED- Default:
true
- Enable or disable remote configuration. Also accepts the alias
DD_REMOTE_CONFIG_ENABLED. DD_REMOTE_CONFIG_POLL_INTERVAL_SECONDS- Default:
5.0
- Interval in seconds for polling remote configuration updates.
Agent
DD_AGENT_HOST- Default:
localhost
- Sets the hostname of the Datadog Agent.
DD_TRACE_AGENT_PORT- Default:
8126
- Sets the port of the Datadog Agent for trace collection.
DD_TRACE_AGENT_URL- Default:
(none)
- Sets the URL of the Datadog Agent. Example:
http://localhost:8126. This takes precedence over DD_AGENT_HOST and DD_TRACE_AGENT_PORT. DD_DOGSTATSD_HOST- Default:
localhost
- Sets the hostname for DogStatsD metric collection.
DD_DOGSTATSD_PORT- Default:
8125
- Sets the port for DogStatsD metric collection.
DD_DOGSTATSD_URL- Default:
(none)
- Sets the URL for DogStatsD. This takes precedence over
DD_DOGSTATSD_HOST and DD_DOGSTATSD_PORT. DD_INSTRUMENTATION_TELEMETRY_ENABLED- Default:
true
- Enable or disable telemetry data collection and sending.
DD_TELEMETRY_HEARTBEAT_INTERVAL- Default:
60.0
- Interval in seconds for sending telemetry heartbeat messages.
DD_TELEMETRY_LOG_COLLECTION_ENABLED- Default:
true
- Enable or disable log collection for telemetry.
Logging
DD_LOG_LEVEL- Default:
ERROR
- Sets the internal log level for the SDK. Valid values:
DEBUG, INFO, WARN, ERROR.
Sampling
DD_TRACE_SAMPLING_RULES- Default:
(none)
- A JSON array of objects to apply for trace sampling. Each rule must have a
sample_rate between 0.0 and 1.0 (inclusive). DD_TRACE_RATE_LIMIT- Default:
100
- Maximum number of traces to sample per second.
Trace context propagation
DD_TRACE_PROPAGATION_STYLE- Default:
datadog,tracecontext
- A comma-separated list of propagation styles to use for both extraction and injection. Supported values are
datadog and tracecontext. See Propagating Rust Trace Context for more information. DD_TRACE_PROPAGATION_STYLE_EXTRACT- Default:
(none)
- A comma-separated list of propagation styles to use for extraction. When set, this overrides
DD_TRACE_PROPAGATION_STYLE for extraction. DD_TRACE_PROPAGATION_STYLE_INJECT- Default:
(none)
- A comma-separated list of propagation styles to use for injection. When set, this overrides
DD_TRACE_PROPAGATION_STYLE for injection. DD_TRACE_PROPAGATION_EXTRACT_FIRST- Default:
false
- When set to
true, stops extracting after the first successful trace context extraction.
Further reading
