var s strings.Builder
	for _, kv := range kvs {
		s.WriteString(kv.String())
		s.WriteString(KvSpaceSeparator)
	}
	return s.String()
}

// Merge environment values with on disk KVS, environment values overrides
// anything on the disk.
func Merge(cfgKVS map[string]KVS, envname string, defaultKVS KVS) map[string]KVS {
	newCfgKVS := make(map[string]KVS)
	for _, e := range env.List(envname) {

		// else simply add to the map. This may happen if ILM expiry replication
		// was disabled for sometime and rules were updated independently in different
		// sites. Latest changes would get applied but merge only the non transition details
		if existingRl, ok := rMap[id]; ok {
			clonedRl := rl.CloneNonTransition()
			clonedRl.Transition = existingRl.Transition

			disks: diskMap,
			jobID: jobID,
			depID: dID,
		})
		m.Merge(&mLocal)
		// Allow half the interval for collecting remote...
		cctx, cancel := context.WithTimeout(ctx, interval/2)
		mRemote := collectRemoteMetrics(cctx, types, collectMetricsOpts{
			hosts: hostMap,
			disks: diskMap,
			jobID: jobID,
			depID: dID,
		})
		cancel()
		m.Merge(&mRemote)
		if !byHost {
			m.ByHost = nil
		}

		t.Errorf("got unexpected result: %#v", got)
	}
}

func Test_metaCacheEntries_merge(t *testing.T) {
	org := loadMetacacheSampleEntries(t)
	a, b := org.shallowClone(), org.shallowClone()
	be := b.entries()
	for i := range be {
		//  Modify b so it isn't deduplicated.
		be[i].metadata = []byte("something-else")
	}
	// Merge b into a
	a.merge(b, -1)
	//nolint:gocritic

// are merged together into a single JSON key, also
// to remove any extraneous JSON bodies.
//
// Go stdlib doesn't support parsing JSON with duplicate
// keys, so we need to use this technique to merge the
// keys.
func sanitizePolicy(r io.Reader) (io.Reader, error) {
	var buf bytes.Buffer
	e := json.NewEncoder(&buf)
	d := jstream.NewDecoder(r, 0).ObjectAsKVS()
	sset := set.NewStringSet()

						t.Errorf("want %v != got %v", test.want, got)
					}
				})
			}
		})
	}
}

func Test_mergeEntryChannels(t *testing.T) {
	dataZ, err := os.ReadFile("testdata/xl-meta-merge.zip")
	if err != nil {
		t.Fatal(err)
	}
	var vers []metaCacheEntry
	zr, err := zip.NewReader(bytes.NewReader(dataZ), int64(len(dataZ)))
	if err != nil {
		t.Fatal(err)
	}

	for i, stat := range lastDayStats {
		if errs[i] != nil {
			peersLogOnceIf(ctx, fmt.Errorf("failed to fetch last day tier stats: %w", errs[i]), sys.peerClients[i].host.String())
			continue
		}
		merged.merge(stat)
	}
	return merged
}

// GetReplicationMRF - Get replication MRF from all peers.

	entry.API.Status = opts.Status
	entry.Tags = make(map[string]interface{}, len(opts.Tags))
	for k, v := range opts.Tags {
		entry.Tags[k] = v
	}

	// Merge tag information if found - this is currently needed for tags
	// set during decommissioning.
	if reqInfo := logger.GetReqInfo(ctx); reqInfo != nil {
		reqInfo.PopulateTagsMap(entry.Tags)
	}

		if i > 0 {
			versions[i].SuccessorModTime = versions[i-1].ModTime
		}
	}
	if len(versions) > 0 {
		versions[0].IsLatest = true
	}
	return versions, nil
}

// mergeXLV2Versions will merge all versions, typically from different disks
// that have at least quorum entries in all metas.
// Each version slice should be sorted.
// Quorum must be the minimum number of matching metadata files.