How to Add Correlation IDs to Your Go Logs with the Slog Package?

Incorporating Correlation IDs into Go Logging with the Slog Package

When using the Go Slog package for JSON logging, you may encounter a need to track logs related to specific requests using correlation or trace IDs. Here's how to achieve this:

The problem lies in the lack of a straightforward way to configure trace ID options within the Slog package. The suggested solution is to retrieve the trace ID from the context and generate a new logger with it. This new logger can then be utilized to append the trace ID to all subsequent messages.

To implement this solution, follow these steps:

1. Retrieve the trace ID from the context:

   <code class="go">traceId := ctx.Value("traceId")</code>

2. Create a new logger with the trace ID:

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

3. Use the new logger to log messages:

   <code class="go">// use newLogger that will add traceId to all messages</code>

This approach allows you to track logs related to specific requests by adding the trace ID to all messages generated using the new logger.

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