Add a prefix to the stack trace printed after SetLogger timeout

Signed-off-by: Vince Prignano <[email protected]>

Author: vincepri

pkg/log/log.go

@@ -34,6 +34,7 @@ limitations under the License.
 package log
 
 import (
+	"bytes"
 	"context"
 	"fmt"
 	"os"
@@ -56,7 +57,15 @@ func eventuallyFulfillRoot() {
 	}
 	if time.Since(rootLogCreated).Seconds() >= 30 {
 		if logFullfilled.CompareAndSwap(false, true) {
-			fmt.Fprintf(os.Stderr, "[controller-runtime] log.SetLogger(...) was never called, logs will not be displayed:\n%s", debug.Stack())
+			stack := debug.Stack()
+			stackLines := bytes.Count(stack, []byte{'\n'})
+			sep := []byte{'\n', '\t', '>', ' ', ' '}
+
+			fmt.Fprintf(os.Stderr,
+				"[controller-runtime] log.SetLogger(...) was never called, logs will not be displayed:%s%s", sep,
+				// prefix every line, so it's clear this is a stack trace related to the above message
+				bytes.Replace(stack, []byte{'\n'}, sep, stackLines-1),
+			)
 			SetLogger(logr.New(NullLogSink{}))
 		}
 	}