Author: Klaus Post <******@****.***>
Date:   Thu Nov 18 12:15:22 2021 -0800

    Improve performance on multiple versions (#13573)
```

- A fix must be a valid fix that was reproduced and seen in a customer environment, for example.

```
commit 886262e58af77ebc7c836ef587c08544e9a0c271
Author: Harshavardhana <******@****.***>
Date:   Wed Nov 17 15:49:12 2021 -0800

type preSignValues struct {
	signValues
	Date    time.Time
	Expires time.Duration
}

// Parses signature version '4' query string of the following form.
//
//	querystring = X-Amz-Algorithm=algorithm
//	querystring += &X-Amz-Credential= urlencode(accessKey + '/' + credential_scope)
//	querystring += &X-Amz-Date=date
//	querystring += &X-Amz-Expires=timeout interval

	ReplicatedCount int64 `json:"replicationCount"`
	// Replication latency information
	Latency ReplicationLatency `json:"replicationLatency"`
	// transfer rate for large uploads
	XferRateLrg *XferStats `json:"largeTransferRate" msg:"lt"`
	// transfer rate for small uploads
	XferRateSml *XferStats `json:"smallTransferRate" msg:"st"`
	// Endpoint is the replication target endpoint
	Endpoint string `json:"-"`

		return
	default:
		list.eventsSkipped.Add(1)
		err := fmt.Errorf("concurrent target notifications exceeded %d, configured notification target is too slow to accept events for the incoming request rate", maxConcurrentAsyncSend)
		for id := range targetIDset {
			reqInfo := &logger.ReqInfo{}
			reqInfo.AppendTags("targetID", id.String())

	if de.Empty() {
		return nil
	}

	type delMarkerExpiration DelMarkerExpiration
	return enc.EncodeElement(delMarkerExpiration(de), start)
}

// NextDue returns upcoming DelMarkerExpiration date for obj if
// applicable, returns false otherwise.
func (de DelMarkerExpiration) NextDue(obj ObjectOpts) (time.Time, bool) {
	if !obj.IsLatest || !obj.DeleteMarker {
		return time.Time{}, false
	}

					throughputHighestPut = totalPut
					// let the client see lower value as well
					throughputHighestGet = totalGet
				}
				sendResult()
				break
			}

			// We break if we did not see 2.5% growth rate in total GET
			// requests, we have reached our peak at this point.
			doBreak := float64(totalGet-throughputHighestGet)/float64(totalGet) < 0.025

			throughputHighestGet = totalGet
			throughputHighestResults = results

//
//   # optional flags based filtering criteria
//   # for source objects
//   flags:
//     filter:
//       newerThan: "7d"
//       olderThan: "7d"
//       createdAfter: "date"
//       createdBefore: "date"
//       tags:
//         - key: "name"
//           value: "value*"
//       metadata:
//         - key: "content-type"
//           value: "image/*"
//     notify:

	// Auth middleware verifies incoming authorization headers and routes them
	// accordingly. Client receives a HTTP error for invalid/unsupported
	// signatures.
	//
	// Validates all incoming requests to have a valid date header.
	setAuthMiddleware,
	// Redirect some pre-defined browser request paths to a static location
	// prefix.
	setBrowserRedirectMiddleware,
	// Adds 'crossdomain.xml' policy middleware to serve legacy flash clients.

	ActualSize int64             `json:"actualSize"` // Original size of the part without compression or encryption bytes.
	ModTime    time.Time         `json:"modTime"`    // Date and time at which the part was uploaded.
	Index      []byte            `json:"index,omitempty" msg:"index,omitempty"`
	Checksums  map[string]string `json:"crc,omitempty" msg:"crc,omitempty"` // Content Checksums
}

		},
		{ // Expiration with invalid date
			inputXML: ` <Expiration>
                                    <Date>invalid date</Date>
                                    </Expiration>`,
			expectedErr: errLifecycleInvalidDate,
		},
		{ // Expiration with both number of days nor a date
			inputXML: `<Expiration>
		                    <Date>2019-04-20T00:01:00Z</Date>
		                    </Expiration>`,