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Update package scrape for new labels.Labels type

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Signed-off-by: Bryan Boreham <bjboreham@gmail.com>
This commit is contained in:
Bryan Boreham 2022-03-09 22:26:24 +00:00
parent b3ca791bfd
commit 91254fb187
2 changed files with 67 additions and 57 deletions
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52
scrape/scrape.go
View file

@ -268,6 +268,7 @@ type scrapeLoopOptions struct {
const maxAheadTime = 10 * time.Minute
// returning an empty label set is interpreted as "drop"
type labelsMutator func(labels.Labels) labels.Labels
func newScrapePool(cfg *config.ScrapeConfig, app storage.Appendable, jitterSeed uint64, logger log.Logger, options *Options) (*scrapePool, error) {
@ -498,9 +499,9 @@ func (sp *scrapePool) Sync(tgs []*targetgroup.Group) {
}
targetSyncFailed.WithLabelValues(sp.config.JobName).Add(float64(len(failures)))
for _, t := range targets {
if t.Labels().Len() > 0 {
if !t.Labels().IsEmpty() {
all = append(all, t)
} else if t.DiscoveredLabels().Len() > 0 {
} else if !t.DiscoveredLabels().IsEmpty() {
sp.droppedTargets = append(sp.droppedTargets, t)
}
}
@ -634,7 +635,7 @@ func verifyLabelLimits(lset labels.Labels, limits *labelLimits) error {
met := lset.Get(labels.MetricName)
if limits.labelLimit > 0 {
nbLabels := len(lset)
nbLabels := lset.Len()
if nbLabels > int(limits.labelLimit) {
return fmt.Errorf("label_limit exceeded (metric: %.50s, number of labels: %d, limit: %d)", met, nbLabels, limits.labelLimit)
}
@ -644,7 +645,7 @@ func verifyLabelLimits(lset labels.Labels, limits *labelLimits) error {
return nil
}
for _, l := range lset {
return lset.Validate(func(l labels.Label) error {
if limits.labelNameLengthLimit > 0 {
nameLength := len(l.Name)
if nameLength > int(limits.labelNameLengthLimit) {
@ -658,8 +659,8 @@ func verifyLabelLimits(lset labels.Labels, limits *labelLimits) error {
return fmt.Errorf("label_value_length_limit exceeded (metric: %.50s, label name: %.50s, value: %.50q, length: %d, limit: %d)", met, l.Name, l.Value, valueLength, limits.labelValueLengthLimit)
}
}
}
return nil
})
}
func mutateSampleLabels(lset labels.Labels, target *Target, honor bool, rc []*relabel.Config) labels.Labels {
@ -667,37 +668,37 @@ func mutateSampleLabels(lset labels.Labels, target *Target, honor bool, rc []*re
targetLabels := target.Labels()
if honor {
for _, l := range targetLabels {
targetLabels.Range(func(l labels.Label) {
if !lset.Has(l.Name) {
lb.Set(l.Name, l.Value)
}
}
})
} else {
var conflictingExposedLabels labels.Labels
for _, l := range targetLabels {
var conflictingExposedLabels []labels.Label
targetLabels.Range(func(l labels.Label) {
existingValue := lset.Get(l.Name)
if existingValue != "" {
conflictingExposedLabels = append(conflictingExposedLabels, labels.Label{Name: l.Name, Value: existingValue})
}
// It is now safe to set the target label.
lb.Set(l.Name, l.Value)
}
})
if len(conflictingExposedLabels) > 0 {
resolveConflictingExposedLabels(lb, lset, targetLabels, conflictingExposedLabels)
}
}
res := lb.Labels(nil)
res := lb.Labels(labels.EmptyLabels())
if len(rc) > 0 {
res = relabel.Process(res, rc...)
res, _ = relabel.Process(res, rc...)
}
return res
}
func resolveConflictingExposedLabels(lb *labels.Builder, exposedLabels, targetLabels, conflictingExposedLabels labels.Labels) {
func resolveConflictingExposedLabels(lb *labels.Builder, exposedLabels, targetLabels labels.Labels, conflictingExposedLabels []labels.Label) {
sort.SliceStable(conflictingExposedLabels, func(i, j int) bool {
return len(conflictingExposedLabels[i].Name) < len(conflictingExposedLabels[j].Name)
})
@ -708,7 +709,7 @@ func resolveConflictingExposedLabels(lb *labels.Builder, exposedLabels, targetLa
newName = model.ExportedLabelPrefix + newName
if !exposedLabels.Has(newName) &&
!targetLabels.Has(newName) &&
!conflictingExposedLabels[:i].Has(newName) {
!labelSliceHas(conflictingExposedLabels[:i], newName) {
conflictingExposedLabels[i].Name = newName
break
}
@ -720,15 +721,24 @@ func resolveConflictingExposedLabels(lb *labels.Builder, exposedLabels, targetLa
}
}
func labelSliceHas(lbls []labels.Label, name string) bool {
for _, l := range lbls {
if l.Name == name {
return true
}
}
return false
}
func mutateReportSampleLabels(lset labels.Labels, target *Target) labels.Labels {
lb := labels.NewBuilder(lset)
for _, l := range target.Labels() {
target.Labels().Range(func(l labels.Label) {
lb.Set(model.ExportedLabelPrefix+l.Name, lset.Get(l.Name))
lb.Set(l.Name, l.Value)
}
})
return lb.Labels(nil)
return lb.Labels(labels.EmptyLabels())
}
// appender returns an appender for ingested samples from the target.
@ -1599,8 +1609,8 @@ loop:
// and relabeling and store the final label set.
lset = sl.sampleMutator(lset)
// The label set may be set to nil to indicate dropping.
if lset == nil {
// The label set may be set to empty to indicate dropping.
if lset.IsEmpty() {
sl.cache.addDropped(mets)
continue
}
@ -1857,12 +1867,10 @@ func (sl *scrapeLoop) addReportSample(app storage.Appender, s string, t int64, v
ref = ce.ref
lset = ce.lset
} else {
lset = labels.Labels{
// The constants are suffixed with the invalid \xff unicode rune to avoid collisions
// with scraped metrics in the cache.
// We have to drop it when building the actual metric.
labels.Label{Name: labels.MetricName, Value: s[:len(s)-1]},
}
lset = labels.FromStrings(labels.MetricName, s[:len(s)-1])
lset = sl.reportSampleMutator(lset)
}

64
scrape/target.go
View file

@ -172,22 +172,20 @@ func (t *Target) offset(interval time.Duration, jitterSeed uint64) time.Duration
// Labels returns a copy of the set of all public labels of the target.
func (t *Target) Labels() labels.Labels {
lset := make(labels.Labels, 0, len(t.labels))
for _, l := range t.labels {
b := labels.NewScratchBuilder(t.labels.Len())
t.labels.Range(func(l labels.Label) {
if !strings.HasPrefix(l.Name, model.ReservedLabelPrefix) {
lset = append(lset, l)
b.Add(l.Name, l.Value)
}
}
return lset
})
return b.Labels()
}
// DiscoveredLabels returns a copy of the target's labels before any processing.
func (t *Target) DiscoveredLabels() labels.Labels {
t.mtx.Lock()
defer t.mtx.Unlock()
lset := make(labels.Labels, len(t.discoveredLabels))
copy(lset, t.discoveredLabels)
return lset
return t.discoveredLabels.Copy()
}
// SetDiscoveredLabels sets new DiscoveredLabels
@ -205,9 +203,9 @@ func (t *Target) URL() *url.URL {
params[k] = make([]string, len(v))
copy(params[k], v)
}
for _, l := range t.labels {
t.labels.Range(func(l labels.Label) {
if !strings.HasPrefix(l.Name, model.ParamLabelPrefix) {
continue
return
}
ks := l.Name[len(model.ParamLabelPrefix):]
@ -216,7 +214,7 @@ func (t *Target) URL() *url.URL {
} else {
params[ks] = []string{l.Value}
}
}
})
return &url.URL{
Scheme: t.labels.Get(model.SchemeLabel),
@ -374,15 +372,15 @@ func PopulateLabels(lset labels.Labels, cfg *config.ScrapeConfig, noDefaultPort
}
}
preRelabelLabels := lb.Labels(nil)
lset = relabel.Process(preRelabelLabels, cfg.RelabelConfigs...)
preRelabelLabels := lb.Labels(labels.EmptyLabels())
lset, keep := relabel.Process(preRelabelLabels, cfg.RelabelConfigs...)
// Check if the target was dropped.
if lset == nil {
return nil, preRelabelLabels, nil
if !keep {
return labels.EmptyLabels(), preRelabelLabels, nil
}
if v := lset.Get(model.AddressLabel); v == "" {
return nil, nil, errors.New("no address")
return labels.EmptyLabels(), labels.EmptyLabels(), errors.New("no address")
}
lb = labels.NewBuilder(lset)
@ -413,7 +411,7 @@ func PopulateLabels(lset labels.Labels, cfg *config.ScrapeConfig, noDefaultPort
case "https":
addr = addr + ":443"
default:
return nil, nil, errors.Errorf("invalid scheme: %q", cfg.Scheme)
return labels.EmptyLabels(), labels.EmptyLabels(), errors.Errorf("invalid scheme: %q", cfg.Scheme)
}
lb.Set(model.AddressLabel, addr)
}
@ -434,50 +432,54 @@ func PopulateLabels(lset labels.Labels, cfg *config.ScrapeConfig, noDefaultPort
}
if err := config.CheckTargetAddress(model.LabelValue(addr)); err != nil {
return nil, nil, err
return labels.EmptyLabels(), labels.EmptyLabels(), err
}
interval := lset.Get(model.ScrapeIntervalLabel)
intervalDuration, err := model.ParseDuration(interval)
if err != nil {
return nil, nil, errors.Errorf("error parsing scrape interval: %v", err)
return labels.EmptyLabels(), labels.EmptyLabels(), errors.Errorf("error parsing scrape interval: %v", err)
}
if time.Duration(intervalDuration) == 0 {
return nil, nil, errors.New("scrape interval cannot be 0")
return labels.EmptyLabels(), labels.EmptyLabels(), errors.New("scrape interval cannot be 0")
}
timeout := lset.Get(model.ScrapeTimeoutLabel)
timeoutDuration, err := model.ParseDuration(timeout)
if err != nil {
return nil, nil, errors.Errorf("error parsing scrape timeout: %v", err)
return labels.EmptyLabels(), labels.EmptyLabels(), errors.Errorf("error parsing scrape timeout: %v", err)
}
if time.Duration(timeoutDuration) == 0 {
return nil, nil, errors.New("scrape timeout cannot be 0")
return labels.EmptyLabels(), labels.EmptyLabels(), errors.New("scrape timeout cannot be 0")
}
if timeoutDuration > intervalDuration {
return nil, nil, errors.Errorf("scrape timeout cannot be greater than scrape interval (%q > %q)", timeout, interval)
return labels.EmptyLabels(), labels.EmptyLabels(), errors.Errorf("scrape timeout cannot be greater than scrape interval (%q > %q)", timeout, interval)
}
// Meta labels are deleted after relabelling. Other internal labels propagate to
// the target which decides whether they will be part of their label set.
for _, l := range lset {
lset.Range(func(l labels.Label) {
if strings.HasPrefix(l.Name, model.MetaLabelPrefix) {
lb.Del(l.Name)
}
}
})
// Default the instance label to the target address.
if v := lset.Get(model.InstanceLabel); v == "" {
lb.Set(model.InstanceLabel, addr)
}
res = lb.Labels(nil)
for _, l := range res {
res = lb.Labels(labels.EmptyLabels())
err = res.Validate(func(l labels.Label) error {
// Check label values are valid, drop the target if not.
if !model.LabelValue(l.Value).IsValid() {
return nil, nil, errors.Errorf("invalid label value for %q: %q", l.Name, l.Value)
return errors.Errorf("invalid label value for %q: %q", l.Name, l.Value)
}
return nil
})
if err != nil {
return labels.EmptyLabels(), labels.EmptyLabels(), err
}
return res, preRelabelLabels, nil
}
@ -501,12 +503,12 @@ func TargetsFromGroup(tg *targetgroup.Group, cfg *config.ScrapeConfig, noDefault
lset := labels.New(lbls...)
lbls, origLabels, err := PopulateLabels(lset, cfg, noDefaultPort)
lset, origLabels, err := PopulateLabels(lset, cfg, noDefaultPort)
if err != nil {
failures = append(failures, errors.Wrapf(err, "instance %d in group %s", i, tg))
}
if lbls != nil || origLabels != nil {
targets = append(targets, NewTarget(lbls, origLabels, cfg.Params))
if !lset.IsEmpty() || !origLabels.IsEmpty() {
targets = append(targets, NewTarget(lset, origLabels, cfg.Params))
}
}
return targets, failures