Adding upstream version 1.34.4.

Signed-off-by: Daniel Baumann <daniel@debian.org>

plugins/common/kafka/config_test.go

@@ -0,0 +1,22 @@
+package kafka
+
+import (
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestBackoffFunc(t *testing.T) {
+	b := 250 * time.Millisecond
+	limit := 1100 * time.Millisecond
+
+	f := makeBackoffFunc(b, limit)
+	require.Equal(t, b, f(0, 0))
+	require.Equal(t, b*2, f(1, 0))
+	require.Equal(t, b*4, f(2, 0))
+	require.Equal(t, limit, f(3, 0)) // would be 2000 but that's greater than max
+
+	f = makeBackoffFunc(b, 0)      // max = 0 means no max
+	require.Equal(t, b*8, f(3, 0)) // with no max, it's 2000
+}