MockResponse(
        code = 503,
        headers = headersOf("Retry-After", "0"),
        body = "please retry",
      ),
    )
    server.enqueue(
      MockResponse(body = "thank you for retrying"),
    )
    val request =
      Request(
        url = server.url("/"),
        body =
          object : RequestBody() {
            var attempt = 0

            this.treeHandle = null;

            // Optimization: Add connection retry for transient failures
            if (isRetryableException(e) && shouldRetryConnection()) {
                log.debug("Retrying tree connection after transient failure", e);
                try {
                    Thread.sleep(100); // Brief delay before retry

- The kubelet plugin manager now properly handles plugin registration failures by removing failed plugins from the actual state and retrying with exponential backoff (initial delay 500ms, doubling each failure up to ~2 minutes maximum) to protect against broken plugins causing denial of service while still allowing recovery from transient failures. ([#133335](https://github.com/kuber...

* Replace controller presence checking logic ([#36924](https://github.com/kubernetes/kubernetes/pull/36924), [@krousey](https://github.com/krousey))
* Fix a bug in scheduler happening after retrying unsuccessful bindings ([#37293](https://github.com/kubernetes/kubernetes/pull/37293), [@wojtek-t](https://github.com/wojtek-t))