notificationEventsSkippedTotal    = "events_skipped_total"
)

var (
	notificationCurrentSendInProgressMD = NewCounterMD(notificationCurrentSendInProgress, "Number of concurrent async Send calls active to all targets")
	notificationEventsErrorsTotalMD     = NewCounterMD(notificationEventsErrorsTotal, "Events that were failed to be sent to the targets")

)

// ConsoleLoggerTgt is a stringified value to represent console logging
const ConsoleLoggerTgt = "console+http"

// ExitFunc is called by Fatal() class functions, by default it calls os.Exit()
var ExitFunc = os.Exit

// Logger interface describes the methods that need to be implemented to satisfy the interface requirements.
type Logger interface {
	json(msg string, args ...interface{})

	globalTCPOptions        xhttp.TCPOptions
	globalHTTPServerErrorCh = make(chan error)
	globalOSSignalCh        = make(chan os.Signal, 1)

	// global Trace system to send HTTP request/response
	// and Storage/OS calls info to registered listeners.
	globalTrace = pubsub.New[madmin.TraceInfo, madmin.TraceType](8)

	// global Listen system to send S3 API events to registered listeners
	globalHTTPListen = pubsub.New[event.Event, pubsub.Mask](0)

		if idx < 0 {
			return -1, toObjectErr(errDiskFull)
		}
	}

	return idx, nil
}

// getPoolIdx returns the found previous object and its corresponding pool idx,
// if none are found falls back to most available space pool, this function is
// designed to be only used by PutObject, CopyObject (newObject creation) and NewMultipartUpload.

		Help:      "Distribution of time to first byte across API calls",
		Type:      gaugeMetric,
	}
}

func getBucketTTFBDistributionMD() MetricDescription {
	return MetricDescription{
		Namespace: bucketMetricNamespace,
		Subsystem: ttfbSubsystem,
		Name:      ttfbDistribution,
		Help:      "Distribution of time to first byte across API calls per bucket",
		Type:      gaugeMetric,
	}
}

	objectEncryption = objectEncryption || crypto.IsSourceEncrypted(srcInfo.UserDefined)

	var compressMetadata map[string]string
	// No need to compress for remote etcd calls
	// Pass the decompressed stream to such calls.
	isDstCompressed := isCompressible(r.Header, dstObject) &&
		length > minCompressibleSize &&
		!isRemoteCopyRequired(ctx, srcBucket, dstBucket, objectAPI) && !cpSrcDstSame && !objectEncryption

			// by the client, but we still see an error - this would mean
			// that we have some parts or data blocks missing or corrupted
			// - attempt a heal to successfully heal them for future calls.
			if written == partLength {
				var scan madmin.HealScanMode
				switch {
				case errors.Is(err, errFileNotFound):
					scan = madmin.HealNormalScan
				case errors.Is(err, errFileCorrupt):

					ObjectOptions{
						DeletePrefix:       true, // use prefix delete to delete all versions at once.
						DeletePrefixObject: true, // use prefix delete on exact object (this is an optimization to avoid fan-out calls)
						NoAuditLog:         true,
					},
				)
				stopFn(err)
				auditLogRebalance(ctx, "Rebalance:DeleteObject", bucket, entry.name, "", err)
				if err != nil {
					rebalanceLogIf(ctx, err)
				}

	UndoWrite bool `msg:"u"`
	// OldDataDir of the previous object
	OldDataDir string `msg:"o,omitempty"` // old data dir used only when to revert a rename()
}

// BaseOptions represents common options for all Storage API calls
type BaseOptions struct{}

// RenameOptions represents rename API options, currently its same as BaseOptions
type RenameOptions struct {
	BaseOptions
}

// DiskInfoOptions options for requesting custom results.

func (client *storageRESTClient) GetDiskID() (string, error) {
	if !client.IsOnline() {
		// make sure to check if the disk is offline, since the underlying
		// value is cached we should attempt to invalidate it if such calls
		// were attempted. This can lead to false success under certain conditions
		// - this change attempts to avoid stale information if the underlying
		// transport is already down.
		return "", errDiskNotFound
	}