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After you set up the tracing library with your code, configure the Agent to collect APM data, and activate the Go integration, optionally configure the tracing library as desired.
Datadog recommends using DD_ENV, DD_SERVICE, and DD_VERSION to set env, service, and version for your services.
Read the Unified Service Tagging documentation for recommendations on how to configure these environment variables. These variables are available for versions 1.24.0+ of the Go tracer.
You may also elect to provide env, service, and version through the tracer’s API:
package main
import (
"gopkg.in/DataDog/dd-trace-go.v1/ddtrace/tracer"
)
func main() {
tracer.Start(
tracer.WithEnv("prod"),
tracer.WithService("test-go"),
tracer.WithServiceVersion("abc123"),
)
// When the tracer is stopped, it will flush everything it has to the Datadog Agent before quitting.
// Make sure this line stays in your main function.
defer tracer.Stop()
}
The Go tracer supports additional environment variables and functions for configuration. See all available options in the configuration documentation.
DD_VERSION1.2.3, 6c44da20, 2020.02.13DD_SERVICEDD_ENVDD_TRACE_ENABLEDtrueDD_TRACE_AGENT_PORT8126receiver_port or DD_APM_RECEIVER_PORT to something other than the default 8126, then the library configuration DD_DOGSTATSD_PORT must match it.DD_TRACE_SAMPLE_RATEnilDD_TRACE_RATE_LIMITDD_TRACE_STARTUP_LOGStrueDD_TRACE_DEBUGfalseDD_SERVICE_MAPPINGnullmysql:mysql-service-name,postgres:postgres-service-name, mysql:mysql-service-name postgres:postgres-service-name.DD_TRACE_PARTIAL_FLUSH_ENABLEDfalsetrue or false.
Added in version 1.54.0. Only compatible with the Datadog Agent 7.26.0+.DD_TRACE_PARTIAL_FLUSH_MIN_SPANS1000DD_TRACE_PARTIAL_FLUSH_ENABLED must be true for partial flushing to occur.
Added in version 1.54.0. Only compatible with the Datadog Agent 7.26.0+.DD_TRACE_CLIENT_IP_ENABLEDfalseDD_TRACE_HEADER_TAGSnullmy-header: "DD_TRACE_HEADER_TAGS=my-header"my-header-1 and my-header-2: "DD_TRACE_HEADER_TAGS=my-header1,my-header-2"my-header and rename it to my-tag: "DD_TRACE_HEADER_TAGS=my-header:my-tag"DD_TRACE_SAMPLING_RULESnil"sample_rate". The "name","service", "resource", and "tags" fields are optional. The "sample_rate" value must be between 0.0 and 1.0 (inclusive). Rules are applied in configured order to determine the trace’s sample rate.For more information, see Ingestion Mechanisms.
Examples:
'[{"sample_rate": 0.2}]''[{"service": "a.*", "name": "b", "sample_rate": 0.1}, {"sample_rate": 0.2}]'.HTTP GET resource name: '[{"resource": "HTTP GET", "sample_rate": 0.4}]'.tier tag with the value premium: '[{"tags": {"tier":"premium"}, "sample_rate": 1}]'.DD_SPAN_SAMPLING_RULESnil"sample_rate". The "name","service", "resource", and "tags" fields are optional. Rules are applied in configured order to determine the span’s sample rate. The sample_rate value must be between 0.0 and 1.0 (inclusive).For more information, see Ingestion Mechanisms.
Example:
my-service and operation name http.request, up to 50 traces per second: '[{"service": "my-service", "name": "http.request", "sample_rate":0.5, "max_per_second": 50}]'priority tag with the value high: '[{"tags": {"priority":"high"}, "sample_rate": 1}]'.DD_TAGSlayer:api,team:intake,key:value or layer:api team:intake key:value.DD_AGENT_HOSTlocalhostDD_DOGSTATSD_PORT8125dogstatsd_port or DD_DOGSTATSD_PORT to something other than the default 8125, then the library configuration DD_DOGSTATSD_PORT must match it.DD_INSTRUMENTATION_TELEMETRY_ENABLEDtrueDD_RUNTIME_METRICS_ENABLEDfalseDD_TRACE_PROPAGATION_STYLEdatadog,tracecontextThe APM environment name may be configured in the Agent or using the WithEnv start option of the tracer.
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