Connecting Go Logs and Traces

Automatically Inject Trace and Span IDs

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Manually Inject Trace and Span IDs

The Go tracer exposes two API calls to allow printing trace and span identifiers along with log statements using exported methods from SpanContext type:

package main

import (
    "net/http"

    "gopkg.in/DataDog/dd-trace-go.v1/ddtrace/tracer"
)

func handler(w http.ResponseWriter, r *http.Request) {
    // Create a span for a web request at the /posts URL.
    span := tracer.StartSpan("web.request", tracer.ResourceName("/posts"))
    defer span.Finish()

    // Retrieve Trace ID and Span ID
    traceID := span.Context().TraceID()
    spanID := span.Context().SpanID()

    // Append them to log messages as fields:
    log.Printf("my log message dd.trace_id=%d dd.span_id=%d", traceID, spanID)
}

The above example illustrates how to use the span’s context in the standard library’s log package. Similar logic may be applied to 3rd party packages too.

Note: If you are not using a Datadog Log Integration to parse your logs, custom log parsing rules need to ensure that dd.trace_id and dd.span_id are being parsed as strings. More information can be found in the FAQ on this topic.

Further Reading

お役に立つドキュメント、リンクや記事:

Instrument manually your application to create traces.DOCUMENTATION Implement Opentracing across your applications.DOCUMENTATION Explore your services, resources, and tracesDOCUMENTATION Correlate request logs with traces automaticallyBLOG