### Structured logging

SIG Instrumentation standardized the structure of log messages and references to Kubernetes objects. Structured logging makes parsing, processing, storing, querying and analyzing logs easier. New methods in the klog library enforce log message structure.

    }

    private String join(String message1, String message2) {
        String message = "";

        if (message1 != null && !message1.isEmpty()) {
            message = message1.trim();
        }

        if (message2 != null && !message2.isEmpty()) {
            if (message != null && !message.isEmpty()) {
                if (message.endsWith(".") || message.endsWith("!") || message.endsWith(":")) {

  * detach the volume when pod is terminated ([#45286](https://github.com/kubernetes/kubernetes/pull/45286), [@gnufied](https://github.com/gnufied))

  * Roll up volume error messages in the kubelet sync loop. ([#44938](https://github.com/kubernetes/kubernetes/pull/44938), [@jayunit100](https://github.com/jayunit100))

- Fixes spammy incorrect "Ignoring same-zone topology hints for service since no hints were provided for zone" messages in the kube-proxy logs. ([#133527](https://github.com/kubernetes/kubernetes/pull/133527), [@danwinship](https://github.com/danwinship)) [SIG Network]

- Fixed a missing status prefix in custom resource validation error messages. ([#123822](https://github.com/kubernetes/kubernetes/pull/123822), [@JoelSpeed](https://github.com/JoelSpeed))
- Fixed a race condition in kube-controller-manager and the scheduler, caused by

        preauthService.initializeSession(sessionId, salt, PreauthIntegrityService.HASH_ALGO_SHA512);

        // Simulate message exchange
        preauthService.updatePreauthHash(sessionId, "Message1".getBytes());
        preauthService.updatePreauthHash(sessionId, "Message2".getBytes());

        byte[] expectedHash = preauthService.getCurrentPreauthHash(sessionId);

        // Validation should pass with correct hash

- Changed the error message of `kubectl rollout restart` when subsequent `kubectl rollout restart` commands are executed within a second ([#113040](https://github.com/kubernetes/kubernetes/pull/113040), [@ardaguclu](https://github.com/ardaguclu))

- Previously, the pod name and namespace were eliminated in the event log message. This PR attempts to add the preemptor pod UID in the preemption event message logs for easier debugging and safer transparency. ([#119971](https://github.com/kubernetes/kubernetes/pull/119971), [@kwakubiney](https://github.com/kwakubiney)) [SIG Scheduling]

- Removed leading zeros from the etcd member ID in kubeadm log messages. ([#117919](https://github.com/kubernetes/kubernetes/pull/117919), [@dlipovetsky](https://github.com/dlipovetsky)) [SIG Cluster Lifecycle]

        ProblemCollector collector = ProblemCollectorFactory.newInstance(null);
        collector.setSource("pom.xml");
        collector.add(Problem.Severity.ERROR, "Error message", 10, 5, null);
        collector.add(Problem.Severity.WARNING, "Warning message", 15, 3, null);

        List<Problem> problems = collector.getProblems();
        assertEquals(2, problems.size(), "Should collect both problems");