# Bucket Versioning Design Guide [![Slack](https://slack.min.io/slack?type=svg)](https://slack.min.io) [![Docker Pulls](https://img.shields.io/docker/pulls/minio/minio.svg?maxAge=604800)](https://hub.docker.com/r/minio/minio/)

## Description of `xl.meta`

`xl.meta` is a new self describing backend format used by MinIO to support AWS S3 compatible versioning.
This file is the source of truth for each `version` at rest. `xl.meta` is a msgpack file serialized from a

The JSON body structure can be seen from this sample:

<details><summary>Request Body Sample</summary>

```json
{
  "input": {
    "account": "minio",
    "groups": null,
    "action": "s3:ListBucket",
    "bucket": "test",
    "conditions": {
      "Authorization": [

	}
	return nums
}

// Reads all `xl.meta` metadata as a FileInfo slice.
// Returns error slice indicating the failed metadata reads.
func readAllFileInfo(ctx context.Context, disks []StorageAPI, origbucket string, bucket, object, versionID string, readData, healing bool) ([]FileInfo, []error) {
	metadataArray := make([]FileInfo, len(disks))

	opts := ReadOptions{
		ReadData: readData,
		Healing:  healing,
	}

	ttfbHist := prometheus.NewHistogramVec(
		prometheus.HistogramOpts{
			Name:    "s3_ttfb_seconds",
			Help:    "Time taken by requests served by current MinIO server instance",
			Buckets: histBuckets,
		},
		[]string{"api"},
	)
	observations := []struct {
		val   float64
		label string
	}{
		{
			val:   0.02,
			label: labels[0],
		},
		{
			val:   0.07,

			timeToFirstByte = tc.ResponseRecorder.TTFB()
		}

		entry.AccessKey = reqInfo.Cred.AccessKey
		entry.ParentUser = reqInfo.Cred.ParentUser

		entry.API.Name = reqInfo.API
		entry.API.Bucket = reqInfo.BucketName
		entry.API.Object = reqInfo.ObjectName
		entry.API.Objects = make([]audit.ObjectVersion, 0, len(reqInfo.Objects))
		for _, ov := range reqInfo.Objects {

}

// Represents the V2 backend disk structure version
// under `.minio.sys` and actual data namespace.
// formatErasureV2 - structure holds format config version '2'.
// The V2 format to support "large bucket" support where a bucket
// can span multiple erasure sets.
type formatErasureV2 struct {
	formatMetaV1
	Erasure struct {
		Version string `json:"version"` // Version of 'xl' format.

- Enables Prometheus native histogram support in kube-proxy when feature gate is enabled.

# limitations under the License.
# ==============================================================================
# Sourcing this enables Bazel remote cache (read and write)
# Note that "_push" cache configs write to GCS buckets and require
# authentication. If you are not a Googler, source "public_cache" to enable the
# public read-only cache.
# The cache configs are different for MacOS and Linux
if [[ $(uname -s) == "Darwin" ]]; then

import java.util.SortedSet

class TestClassTime(
    val sourceSet: String,
    val buildTimeMs: Int,
)

data class TestCoverageAndBucketSplits(
    val testCoverageUuid: Int,
    val buckets: List<FunctionalTestBucket>,
)

data class FunctionalTestBucket(
    val subprojects: SortedSet<String>,
    val parallelizationMethod: ParallelizationMethod,
) {

    preBuildSteps: BuildSteps.() -> Unit = {},
) : BaseGradleBuildType(
        stage = stage,
        init = {
            this.id(performanceTestBuildSpec.asConfigurationId(model, "bucket${bucketIndex + 1}"))
            this.name = description
            val type = performanceTestBuildSpec.type
            val os = performanceTestBuildSpec.os
            val arch = performanceTestBuildSpec.arch