Switch to slog, remove logrus (#1672)

util/error.go

@@ -1,10 +1,10 @@
 package util
 
 import (
+	"context"
 	"errors"
 	"fmt"
-
-	"github.com/sirupsen/logrus"
+	"log/slog"
 )
 
 type ContextualError struct {
@@ -28,12 +28,12 @@ func ContextualizeIfNeeded(msg string, err error) error {
 }
 
 // LogWithContextIfNeeded is a helper function to log an error line for an error or ContextualError
-func LogWithContextIfNeeded(msg string, err error, l *logrus.Logger) {
+func LogWithContextIfNeeded(msg string, err error, l *slog.Logger) {
 	switch v := err.(type) {
 	case *ContextualError:
 		v.Log(l)
 	default:
-		l.WithError(err).Error(msg)
+		l.Error(msg, "error", err)
 	}
 }
 
@@ -51,10 +51,19 @@ func (ce *ContextualError) Unwrap() error {
 	return ce.RealError
 }
 
-func (ce *ContextualError) Log(lr *logrus.Logger) {
-	if ce.RealError != nil {
-		lr.WithFields(ce.Fields).WithError(ce.RealError).Error(ce.Context)
-	} else {
-		lr.WithFields(ce.Fields).Error(ce.Context)
+// Log emits ce as a single error-level log line with Fields and RealError
+// promoted to top-level attributes, producing a flat shape callers can grep
+// or parse without walking into a nested object.
+func (ce *ContextualError) Log(l *slog.Logger) {
+	attrs := make([]slog.Attr, 0, len(ce.Fields)+1)
+	for k, v := range ce.Fields {
+		attrs = append(attrs, slog.Any(k, v))
 	}
+	if ce.RealError != nil {
+		attrs = append(attrs, slog.Any("error", ce.RealError))
+	}
+	// LogAttrs is intentional: attrs is built from a map[string]any so it has
+	// no pair-form equivalent.
+	//nolint:sloglint
+	l.LogAttrs(context.Background(), slog.LevelError, ce.Context, attrs...)
 }