// and format-xl.go for details.

// Ideally we will never have a situation where we will have to change the
// fields of this struct and deal with related migration.
type formatMetaV1 struct {
	// Version of the format config.
	Version string `json:"version"`
	// Format indicates the backend format type, supports two values 'xl' and 'fs'.
	Format string `json:"format"`

	EnvCompressExtensionsLegacy      = "MINIO_COMPRESS_EXTENSIONS"
	EnvCompressMimeTypesLegacy2      = "MINIO_COMPRESS_MIME_TYPES"
)

// SetCompressionConfig - One time migration code needed, for migrating from older config to new for Compression.
func SetCompressionConfig(s config.Config, cfg Config) {
	if !cfg.Enabled {
		// No need to save disabled settings in new config.
		return
	}

following the guidance below.
If you are able to, a clean installation is simpler. However, this often requires an external IP migration which can be challenging.

WARNING: when installing over an existing deployment, the two deployments will be merged together by Helm, which may lead to unexpected results.

#### Legacy Gateway Helm charts

  # Block affinities must also be watchable by confd for route aggregation.
  - apiGroups: ["crd.projectcalico.org"]
    resources:
      - blockaffinities
    verbs:
      - watch
  # The Calico IPAM migration needs to get daemonsets. These permissions can be
  # removed if not upgrading from an installation using host-local IPAM.
  - apiGroups: ["apps"]
    resources:
      - daemonsets
    verbs:

	// Lookup bind LDAP service account
	LookupBindDN       string `json:"lookupBindDN"`
	LookupBindPassword string `json:"lookupBindPassword"`
}

// SetIdentityLDAP - One time migration code needed, for migrating from older config to new for LDAPConfig.
func SetIdentityLDAP(s config.Config, ldapArgs LegacyConfig) {
	if !ldapArgs.Enabled {
		// ldap not enabled no need to preserve it in new settings.
		return

* Existing usages of Java serialization should be migrated to use it.
* It is ok for Serializer to be used as a replacement for Java serialization as a migration step.

	InformerFactory    informers.SharedInformerFactory
	DynInformerFactory dynamicinformer.DynamicSharedInformerFactory

	//nolint:staticcheck // SA1019 this deprecated field still needs to be used for now. It will be removed once the migration is done.
	EventBroadcaster events.EventBroadcasterAdapter

	// LeaderElection is optional.
	LeaderElection *leaderelection.LeaderElectionConfig

	// PodMaxInUnschedulablePodsDuration is the maximum time a pod can stay in

        // It would be better to separate these into different scopes, but many things still assume that daemon services are available in the global scope,
        // so keep them merged as a migration step
        buildProcessState = new BuildProcessState(!configuration.isSingleUse(), AgentStatus.of(configuration.isInstrumentationAgentAllowed()), additionalModuleClassPath, loggingServices, NativeServices.getInstance()) {

config for the rest.

All internal services ( telemetry, pilot debug ports, mesh expansion ) can now be configured via the new mechanism.

# Migration from istio-system

Istio 1.0 includes the gateways in istio-system. Since the external IP is associated
with the Service and bound to the namespace, it is recommended to:

1. Install the new gateway in a new namespace.

import (
	"bytes"
	"context"
	"encoding/json"

	kerrors "k8s.io/apimachinery/pkg/api/errors"
)

const (
	UnknownLeader = "leaderelection.k8s.io/unknown"
)

// MultiLock is used for lock's migration
type MultiLock struct {
	Primary   Interface
	Secondary Interface
}

// Get returns the older election record of the lock
func (ml *MultiLock) Get(ctx context.Context) (*LeaderElectionRecord, []byte, error) {