How to Integrate Trace IDs into the `slog` Package in Golang?

Trace ID in the slog Package

This article focuses on incorporating trace IDs into the slog package for Golang. The slog package facilitates JSON output, making it an ideal tool for tracing requests.

Adding Trace ID with Context Values

To add a trace ID, you can leverage Golang's context values:

<code class="go">import "context"

ctx := context.Background()
ctx = context.WithValue(ctx, "traceId", "myTraceId")</code>

Creating a Customized Logger with Trace ID

Once you have the trace ID in the context, you can create a logger that includes it:

<code class="go">traceId = ctx.Value("traceId")
newLogger := logger.With("traceId", traceId)</code>

Utilizing the New Logger with Trace ID

All messages logged using the newLogger will now include the trace ID:

<code class="go">newLogger.Info("message with trace ID")</code>

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