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go.missing_correlation_id

Observability Low

Detects HTTP handlers that don’t propagate correlation IDs for distributed tracing.

Why It Matters

Without correlation IDs:

Can’t trace requests — Logs across services can’t be correlated
Debugging nightmare — Finding related events is manual work
Slow incident response — More time spent correlating logs

Example

// ❌ Before (no correlation ID)
func handler(w http.ResponseWriter, r *http.Request) {
    log.Println("Processing request")
}

// ✅ After (with correlation ID)
func handler(w http.ResponseWriter, r *http.Request) {
    correlationID := r.Header.Get("X-Correlation-ID")
    if correlationID == "" {
        correlationID = uuid.New().String()
    }

    ctx := context.WithValue(r.Context(), "correlation_id", correlationID)
    log.Printf("Processing request correlation_id=%s", correlationID)

    w.Header().Set("X-Correlation-ID", correlationID)
}

What Unfault Detects

HTTP handlers without correlation ID extraction
Log statements without correlation IDs
Outgoing requests without ID forwarding