- Support a smooth upgrade from client-side apply to server-side apply without conflicts, as well as support the corresponding downgrade. ([#90187](https://github.com/kubernetes/kubernetes/pull/90187), [@julianvmodesto](https://github.com/julianvmodesto)) [SIG API Machinery and Testing]

				if !ok {
					ckvs.Set(kv.Key, kv.Value)
				}
			}
			if _, ok := cp[subSys]; !ok {
				rnSubSys, ok := renamedSubsys[subSys]
				if !ok {
					// A config subsystem was removed or server was downgraded.
					continue
				}
				// Copy over settings from previous sub-system
				// to newly renamed sub-system
				for _, kv := range cp[rnSubSys][Default] {
					_, ok := c[subSys][tgt].Lookup(kv.Key)

            return false;
        }
        return true;
    }

    /**
     * Validates if the canonical URL is valid relative to the original URL.
     * Specifically checks for HTTPS to HTTP downgrades.
     *
     * @param url the original URL
     * @param canonicalUrl the canonical URL to validate
     * @return true if the canonical URL is valid, false otherwise
     */

	// Current version being written.
	xlVersionCurrent [4]byte
)

const (
	// Breaking changes.
	// Newer versions cannot be read by older software.
	// This will prevent downgrades to incompatible versions.
	xlVersionMajor = 1

	// Non breaking changes.
	// Bumping this is informational, but should be done
	// if any change is made to the data stored, bumping this

//go:generate stringer -type VersionType,ErasureAlgo -output=xl-storage-format-v2_string.go $GOFILE

const (
	// Breaking changes.
	// Newer versions cannot be read by older software.
	// This will prevent downgrades to incompatible versions.
	xlVersionMajor = 1

	// Non breaking changes.
	// Bumping this is informational, but should be done
	// if any change is made to the data stored, bumping this

          <name>preserveModelVersion</name>
          <version>4.1.0+</version>
          <description>
            Indicates if the build POM for this project should be preserved or downgraded to the lowest
            compatible version.
            @since Maven 4.0.0
          </description>
          <type>boolean</type>
          <defaultValue>false</defaultValue>
        </field>

- fluentd-elasticsearch is unchanged from 1.10: v2.0.4 ([#58525](https://github.com/kubernetes/kubernetes/pull/58525))
- The fluent-plugin-kubernetes_metadata_filter plugin in fluentd-elasticsearch has been downgraded to version 2.0.0 ([#67544](https://github.com/kubernetes/kubernetes/pull/67544))
- fluentd-gcp is unchanged from 1.10: v3.0.0. ([#60722](https://github.com/kubernetes/kubernetes/pull/60722))

* Fix GCE etcd scripts to pass in all required parameters for the etcd migration utility to correctly perform HA upgrades and downgrades ([#61957](https://github.com/kubernetes/kubernetes/pull/61957), [@jpbetz](https://github.com/jpbetz))