fix(kube-runtime): setup backoff with builder pattern

kube-runtime/src/utils/backoff_reset_timer.rs

@@ -83,4 +83,10 @@ mod tests {
             tokio::time::Instant::now().into_std()
         }
     }
+
+    impl<B: Backoff> ResetTimerBackoff<B> {
+        pub fn get_backoff(&self) -> &B {
+            &self.backoff
+        }
+    }
 }

kube-runtime/src/watcher.rs

@@ -898,14 +898,13 @@ type Strategy = ResetTimerBackoff<ExponentialBackoff>;
 impl Default for DefaultBackoff {
     fn default() -> Self {
         Self(ResetTimerBackoff::new(
-            backoff::ExponentialBackoff {
-                initial_interval: Duration::from_millis(800),
-                max_interval: Duration::from_secs(30),
-                randomization_factor: 1.0,
-                multiplier: 2.0,
-                max_elapsed_time: None,
-                ..ExponentialBackoff::default()
-            },
+            backoff::ExponentialBackoffBuilder::new()
+            .with_initial_interval(Duration::from_millis(800))
+            .with_max_interval(Duration::from_secs(30))
+            .with_randomization_factor(1.0)
+            .with_multiplier(2.0)
+            .with_max_elapsed_time(None)
+            .build(),
             Duration::from_secs(120),
         ))
     }
@@ -920,3 +919,13 @@ impl Backoff for DefaultBackoff {
         self.0.reset()
     }
 }
+
+#[cfg(test)]
+mod tests {
+    #[test]
+    fn backoff_start_interval() {
+        let default_backoff = super::DefaultBackoff::default().0;
+        let default_backoff = default_backoff.get_backoff();
+        assert_eq!(default_backoff.current_interval, default_backoff.initial_interval);
+    }
+}