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Add distributor per labelset received samples metric (#6443)
* add distributor per labelset ingestion rate metric Signed-off-by: Ben Ye <[email protected]> * changelog Signed-off-by: Ben Ye <[email protected]> * update metrics synchronously Signed-off-by: Ben Ye <[email protected]> * allocate label set counter only if there are matching limtis for the series Signed-off-by: Ben Ye <[email protected]> * fix counter initialization Signed-off-by: Ben Ye <[email protected]> * fix lock on active users Signed-off-by: Ben Ye <[email protected]> --------- Signed-off-by: Ben Ye <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,95 @@ | ||
| package distributor | ||
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| import ( | ||
| "sync" | ||
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| "github.com/prometheus/client_golang/prometheus" | ||
| "github.com/prometheus/common/model" | ||
| "github.com/prometheus/prometheus/model/labels" | ||
|
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| "github.com/cortexproject/cortex/pkg/util" | ||
| ) | ||
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| const ( | ||
| numMetricShards = 128 | ||
| ) | ||
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| type labelSetTracker struct { | ||
| receivedSamplesPerLabelSet *prometheus.CounterVec | ||
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| shards []*labelSetCounterShard | ||
| } | ||
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| func newLabelSetTracker(receivedSamplesPerLabelSet *prometheus.CounterVec) *labelSetTracker { | ||
| shards := make([]*labelSetCounterShard, 0, numMetricShards) | ||
| for i := 0; i < numMetricShards; i++ { | ||
| shards = append(shards, &labelSetCounterShard{ | ||
| RWMutex: &sync.RWMutex{}, | ||
| userLabelSets: map[string]map[uint64]labels.Labels{}, | ||
| }) | ||
| } | ||
| return &labelSetTracker{shards: shards, receivedSamplesPerLabelSet: receivedSamplesPerLabelSet} | ||
| } | ||
|
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| type labelSetCounterShard struct { | ||
| *sync.RWMutex | ||
| userLabelSets map[string]map[uint64]labels.Labels | ||
| } | ||
|
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| type samplesLabelSetEntry struct { | ||
| floatSamples int64 | ||
| histogramSamples int64 | ||
| labels labels.Labels | ||
| } | ||
|
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| func (m *labelSetTracker) increaseSamplesLabelSet(userId string, hash uint64, labelSet labels.Labels, floatSamples, histogramSamples int64) { | ||
| s := m.shards[util.HashFP(model.Fingerprint(hash))%numMetricShards] | ||
| s.Lock() | ||
| if userEntry, ok := s.userLabelSets[userId]; ok { | ||
| if _, ok2 := userEntry[hash]; !ok2 { | ||
| userEntry[hash] = labelSet | ||
| } | ||
| } else { | ||
| s.userLabelSets[userId] = map[uint64]labels.Labels{hash: labelSet} | ||
| } | ||
| // Unlock before we update metrics. | ||
| s.Unlock() | ||
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| labelSetStr := labelSet.String() | ||
| if floatSamples > 0 { | ||
| m.receivedSamplesPerLabelSet.WithLabelValues(userId, sampleMetricTypeFloat, labelSetStr).Add(float64(floatSamples)) | ||
| } | ||
| if histogramSamples > 0 { | ||
| m.receivedSamplesPerLabelSet.WithLabelValues(userId, sampleMetricTypeHistogram, labelSetStr).Add(float64(histogramSamples)) | ||
| } | ||
| } | ||
|
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| // Clean up dangling user and label set from the tracker as well as metrics. | ||
| func (m *labelSetTracker) updateMetrics(userSet map[string]map[uint64]struct{}) { | ||
| for i := 0; i < numMetricShards; i++ { | ||
| shard := m.shards[i] | ||
| shard.Lock() | ||
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| for user, userEntry := range shard.userLabelSets { | ||
| limits, ok := userSet[user] | ||
| if !ok { | ||
| // If user is removed, we will delete user metrics in cleanupInactiveUser loop | ||
| // so skip deleting metrics here. | ||
| delete(shard.userLabelSets, user) | ||
| continue | ||
| } | ||
| for h, lbls := range userEntry { | ||
| // This limit no longer exists. | ||
| if _, ok := limits[h]; !ok { | ||
| delete(userEntry, h) | ||
| labelSetStr := lbls.String() | ||
| m.receivedSamplesPerLabelSet.DeleteLabelValues(user, sampleMetricTypeFloat, labelSetStr) | ||
| m.receivedSamplesPerLabelSet.DeleteLabelValues(user, sampleMetricTypeHistogram, labelSetStr) | ||
| continue | ||
| } | ||
| } | ||
| } | ||
|
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||
| shard.Unlock() | ||
| } | ||
| } |
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