[WIP] 🌱 Enable per-reconcile logger customization

pkg/builder/controller.go

@@ -154,6 +154,13 @@ func (blder *Builder) WithLogger(log logr.Logger) *Builder {
 	return blder
 }
 
+// WithLoggerCustomizer sets a LoggerCustomizer which allows per-reconcile customization
+// of the logger.
+func (blder *Builder) WithLoggerCustomizer(loggerCustomizer func(logr.Logger, reconcile.Request) logr.Logger) *Builder {
+	blder.ctrlOptions.LoggerCustomizer = loggerCustomizer
+	return blder
+}
+
 // Named sets the name of the controller to the given name.  The name shows up
 // in metrics, among other things, and thus should be a prometheus compatible name
 // (underscores and alphanumeric characters only).

pkg/controller/controller.go

@@ -50,6 +50,9 @@ type Options struct {
 	// request via the context field.
 	Log logr.Logger
 
+	// LoggerCustomizer customizes the logger for individual reconciliations.
+	LoggerCustomizer func(logr.Logger, reconcile.Request) logr.Logger
+
 	// CacheSyncTimeout refers to the time limit set to wait for syncing caches.
 	// Defaults to 2 minutes if not set.
 	CacheSyncTimeout time.Duration
@@ -137,6 +140,7 @@ func NewUnmanaged(name string, mgr manager.Manager, options Options) (Controller
 		SetFields:               mgr.SetFields,
 		Name:                    name,
 		Log:                     options.Log.WithName("controller").WithName(name).WithValues("controller", name),
+		LoggerCustomizer:        options.LoggerCustomizer,
 		RecoverPanic:            options.RecoverPanic,
 	}, nil
 }

pkg/internal/controller/controller.go

@@ -26,6 +26,7 @@ import (
 	"github.com/go-logr/logr"
 	utilruntime "k8s.io/apimachinery/pkg/util/runtime"
 	"k8s.io/client-go/util/workqueue"
+
 	"sigs.k8s.io/controller-runtime/pkg/handler"
 	ctrlmetrics "sigs.k8s.io/controller-runtime/pkg/internal/controller/metrics"
 	logf "sigs.k8s.io/controller-runtime/pkg/log"
@@ -63,6 +64,9 @@ type Controller struct {
 	// Deprecated: the caller should handle injected fields itself.
 	SetFields func(i interface{}) error
 
+	// LoggerCustomizer customizes the logger for individual reconciliations.
+	LoggerCustomizer func(logr.Logger, reconcile.Request) logr.Logger
+
 	// mu is used to synchronize Controller setup
 	mu sync.Mutex
 
@@ -109,8 +113,6 @@ func (c *Controller) Reconcile(ctx context.Context, req reconcile.Request) (_ re
 			}
 		}()
 	}
-	log := c.Log.WithValues("name", req.Name, "namespace", req.Namespace)
-	ctx = logf.IntoContext(ctx, log)
 	return c.Do.Reconcile(ctx, req)
 }
 
@@ -303,7 +305,12 @@ func (c *Controller) reconcileHandler(ctx context.Context, obj interface{}) {
 		return
 	}
 
-	log := c.Log.WithValues("name", req.Name, "namespace", req.Namespace)
+	var log logr.Logger
+	if c.LoggerCustomizer != nil {
+		log = c.LoggerCustomizer(c.Log, req)
+	} else {
+		log = c.Log.WithValues("name", req.Name, "namespace", req.Namespace)
+	}
 	ctx = logf.IntoContext(ctx, log)
 
 	// RunInformersAndControllers the syncHandler, passing it the Namespace/Name string of the