modtime:         htmlModTime,
			wantLastMod:     htmlModTime.UTC().Format(TimeFormat),
			wantStatus:      200,
		},
		"not_modified_modtime": {
			file:      "testdata/style.css",
			serveETag: `"foo"`, // Last-Modified sent only when no ETag
			modtime:   htmlModTime,
			reqHeader: map[string]string{
				"If-Modified-Since": htmlModTime.UTC().Format(TimeFormat),
			},
			wantStatus: 304,
		},

					t.Fatalf("Test %d: Expected transition time %s", i+1, expectedDue)
				}
			} else {
				if expectedDue, _ := lc.Rules[tc.transRuleID].NoncurrentVersionTransition.NextDue(tc.obj); !strings.Contains(transHdrs[0], expectedDue.Format(http.TimeFormat)) {
					t.Fatalf("Test %d: Expected transition time %s", i+1, expectedDue)
				}
			}

	tags["set"] = er.setIndex
	tags["pool"] = er.poolIndex
	tags["merrs"] = joinErrs(errs)
	tags["derrs"] = dataErrsByPart
	if m.IsValid() {
		tags["size"] = m.Size
		tags["mtime"] = m.ModTime.Format(http.TimeFormat)
		tags["data"] = m.Erasure.DataBlocks
		tags["parity"] = m.Erasure.ParityBlocks
	} else {
		tags["invalid-meta"] = true
		tags["data"] = er.setDriveCount - er.defaultParityCount