Add cortex_ingester_active_native_histogram_series metric to track active # of NH series

Signed-off-by: SungJin1212 <tjdwls1201@gmail.com>

Author: SungJin1212

CHANGELOG.md

@@ -6,6 +6,7 @@
 * [FEATURE] Querier/Ruler: Add `query_partial_data` and `rules_partial_data` limits to allow queries/rules to be evaluated with data from a single zone, if other zones are not available. #6526
 * [FEATURE] Update prometheus alertmanager version to v0.28.0 and add new integration msteamsv2, jira, and rocketchat. #6590
 * [FEATURE] Ingester: Support out-of-order native histogram ingestion. It automatically enabled when `-ingester.out-of-order-time-window > 0` and `-blocks-storage.tsdb.enable-native-histograms=true`. #6626 #6663
+* [ENHANCEMENT] Ingester: Add a `cortex_ingester_active_native_histogram_series` metric to track # of active NH series. #6695
 * [ENHANCEMENT] Query Frontend: Add new limit `-frontend.max-query-response-size` for total query response size after decompression in query frontend. #6607
 * [ENHANCEMENT] Alertmanager: Add nflog and silences maintenance metrics. #6659
 * [ENHANCEMENT] Querier: limit label APIs to query only ingesters if `start` param is not been specified. #6618

pkg/ingester/active_series.go

@@ -25,15 +25,17 @@ type activeSeriesStripe struct {
 	// without holding the lock -- hence the atomic).
 	oldestEntryTs atomic.Int64
 
-	mu     sync.RWMutex
-	refs   map[uint64][]activeSeriesEntry
-	active int // Number of active entries in this stripe. Only decreased during purge or clear.
+	mu                    sync.RWMutex
+	refs                  map[uint64][]activeSeriesEntry
+	active                int // Number of active entries in this stripe. Only decreased during purge or clear.
+	activeNativeHistogram int // Number of active entries only for Native Histogram in this stripe. Only decreased during purge or clear.
 }
 
 // activeSeriesEntry holds a timestamp for single series.
 type activeSeriesEntry struct {
-	lbs   labels.Labels
-	nanos *atomic.Int64 // Unix timestamp in nanoseconds. Needs to be a pointer because we don't store pointers to entries in the stripe.
+	lbs               labels.Labels
+	nanos             *atomic.Int64 // Unix timestamp in nanoseconds. Needs to be a pointer because we don't store pointers to entries in the stripe.
+	isNativeHistogram bool
 }
 
 func NewActiveSeries() *ActiveSeries {
@@ -48,10 +50,10 @@ func NewActiveSeries() *ActiveSeries {
 }
 
 // Updates series timestamp to 'now'. Function is called to make a copy of labels if entry doesn't exist yet.
-func (c *ActiveSeries) UpdateSeries(series labels.Labels, hash uint64, now time.Time, labelsCopy func(labels.Labels) labels.Labels) {
+func (c *ActiveSeries) UpdateSeries(series labels.Labels, hash uint64, now time.Time, nativeHistogram bool, labelsCopy func(labels.Labels) labels.Labels) {
 	stripeID := hash % numActiveSeriesStripes
 
-	c.stripes[stripeID].updateSeriesTimestamp(now, series, hash, labelsCopy)
+	c.stripes[stripeID].updateSeriesTimestamp(now, series, hash, nativeHistogram, labelsCopy)
 }
 
 // Purge removes expired entries from the cache. This function should be called
@@ -77,13 +79,21 @@ func (c *ActiveSeries) Active() int {
 	return total
 }
 
-func (s *activeSeriesStripe) updateSeriesTimestamp(now time.Time, series labels.Labels, fingerprint uint64, labelsCopy func(labels.Labels) labels.Labels) {
+func (c *ActiveSeries) ActiveNativeHistogram() int {
+	total := 0
+	for s := 0; s < numActiveSeriesStripes; s++ {
+		total += c.stripes[s].getActiveNativeHistogram()
+	}
+	return total
+}
+
+func (s *activeSeriesStripe) updateSeriesTimestamp(now time.Time, series labels.Labels, fingerprint uint64, nativeHistogram bool, labelsCopy func(labels.Labels) labels.Labels) {
 	nowNanos := now.UnixNano()
 
 	e := s.findEntryForSeries(fingerprint, series)
 	entryTimeSet := false
 	if e == nil {
-		e, entryTimeSet = s.findOrCreateEntryForSeries(fingerprint, series, nowNanos, labelsCopy)
+		e, entryTimeSet = s.findOrCreateEntryForSeries(fingerprint, series, nowNanos, nativeHistogram, labelsCopy)
 	}
 
 	if !entryTimeSet {
@@ -117,7 +127,7 @@ func (s *activeSeriesStripe) findEntryForSeries(fingerprint uint64, series label
 	return nil
 }
 
-func (s *activeSeriesStripe) findOrCreateEntryForSeries(fingerprint uint64, series labels.Labels, nowNanos int64, labelsCopy func(labels.Labels) labels.Labels) (*atomic.Int64, bool) {
+func (s *activeSeriesStripe) findOrCreateEntryForSeries(fingerprint uint64, series labels.Labels, nowNanos int64, nativeHistogram bool, labelsCopy func(labels.Labels) labels.Labels) (*atomic.Int64, bool) {
 	s.mu.Lock()
 	defer s.mu.Unlock()
 
@@ -129,9 +139,13 @@ func (s *activeSeriesStripe) findOrCreateEntryForSeries(fingerprint uint64, seri
 	}
 
 	s.active++
+	if nativeHistogram {
+		s.activeNativeHistogram++
+	}
 	e := activeSeriesEntry{
-		lbs:   labelsCopy(series),
-		nanos: atomic.NewInt64(nowNanos),
+		lbs:               labelsCopy(series),
+		nanos:             atomic.NewInt64(nowNanos),
+		isNativeHistogram: nativeHistogram,
 	}
 
 	s.refs[fingerprint] = append(s.refs[fingerprint], e)
@@ -160,6 +174,7 @@ func (s *activeSeriesStripe) purge(keepUntil time.Time) {
 	defer s.mu.Unlock()
 
 	active := 0
+	activeNativeHistogram := 0
 
 	oldest := int64(math.MaxInt64)
 	for fp, entries := range s.refs {
@@ -173,6 +188,9 @@ func (s *activeSeriesStripe) purge(keepUntil time.Time) {
 			}
 
 			active++
+			if entries[0].isNativeHistogram {
+				activeNativeHistogram++
+			}
 			if ts < oldest {
 				oldest = ts
 			}
@@ -199,6 +217,11 @@ func (s *activeSeriesStripe) purge(keepUntil time.Time) {
 			delete(s.refs, fp)
 		} else {
 			active += cnt
+			for _, e := range entries {
+				if e.isNativeHistogram {
+					activeNativeHistogram++
+				}
+			}
 			s.refs[fp] = entries
 		}
 	}
@@ -209,6 +232,7 @@ func (s *activeSeriesStripe) purge(keepUntil time.Time) {
 		s.oldestEntryTs.Store(oldest)
 	}
 	s.active = active
+	s.activeNativeHistogram = activeNativeHistogram
 }
 
 func (s *activeSeriesStripe) getActive() int {
@@ -217,3 +241,10 @@ func (s *activeSeriesStripe) getActive() int {
 
 	return s.active
 }
+
+func (s *activeSeriesStripe) getActiveNativeHistogram() int {
+	s.mu.RLock()
+	defer s.mu.RUnlock()
+
+	return s.activeNativeHistogram
+}

pkg/ingester/active_series_test.go

@@ -26,16 +26,20 @@ func TestActiveSeries_UpdateSeries(t *testing.T) {
 
 	c := NewActiveSeries()
 	assert.Equal(t, 0, c.Active())
+	assert.Equal(t, 0, c.ActiveNativeHistogram())
 	labels1Hash := fromLabelToLabels(ls1).Hash()
 	labels2Hash := fromLabelToLabels(ls2).Hash()
-	c.UpdateSeries(ls1, labels1Hash, time.Now(), copyFn)
+	c.UpdateSeries(ls1, labels1Hash, time.Now(), true, copyFn)
 	assert.Equal(t, 1, c.Active())
+	assert.Equal(t, 1, c.ActiveNativeHistogram())
 
-	c.UpdateSeries(ls1, labels1Hash, time.Now(), copyFn)
+	c.UpdateSeries(ls1, labels1Hash, time.Now(), true, copyFn)
 	assert.Equal(t, 1, c.Active())
+	assert.Equal(t, 1, c.ActiveNativeHistogram())
 
-	c.UpdateSeries(ls2, labels2Hash, time.Now(), copyFn)
+	c.UpdateSeries(ls2, labels2Hash, time.Now(), true, copyFn)
 	assert.Equal(t, 2, c.Active())
+	assert.Equal(t, 2, c.ActiveNativeHistogram())
 }
 
 func TestActiveSeries_Purge(t *testing.T) {
@@ -52,7 +56,7 @@ func TestActiveSeries_Purge(t *testing.T) {
 		c := NewActiveSeries()
 
 		for i := 0; i < len(series); i++ {
-			c.UpdateSeries(series[i], fromLabelToLabels(series[i]).Hash(), time.Unix(int64(i), 0), copyFn)
+			c.UpdateSeries(series[i], fromLabelToLabels(series[i]).Hash(), time.Unix(int64(i), 0), true, copyFn)
 		}
 
 		c.Purge(time.Unix(int64(ttl+1), 0))
@@ -61,6 +65,7 @@ func TestActiveSeries_Purge(t *testing.T) {
 
 		exp := len(series) - (ttl + 1)
 		assert.Equal(t, exp, c.Active())
+		assert.Equal(t, exp, c.ActiveNativeHistogram())
 	}
 }
 
@@ -71,23 +76,26 @@ func TestActiveSeries_PurgeOpt(t *testing.T) {
 	c := NewActiveSeries()
 
 	now := time.Now()
-	c.UpdateSeries(ls1, ls1.Hash(), now.Add(-2*time.Minute), copyFn)
-	c.UpdateSeries(ls2, ls2.Hash(), now, copyFn)
+	c.UpdateSeries(ls1, ls1.Hash(), now.Add(-2*time.Minute), true, copyFn)
+	c.UpdateSeries(ls2, ls2.Hash(), now, true, copyFn)
 	c.Purge(now)
 
 	assert.Equal(t, 1, c.Active())
+	assert.Equal(t, 1, c.ActiveNativeHistogram())
 
-	c.UpdateSeries(ls1, ls1.Hash(), now.Add(-1*time.Minute), copyFn)
-	c.UpdateSeries(ls2, ls2.Hash(), now, copyFn)
+	c.UpdateSeries(ls1, ls1.Hash(), now.Add(-1*time.Minute), true, copyFn)
+	c.UpdateSeries(ls2, ls2.Hash(), now, true, copyFn)
 	c.Purge(now)
 
 	assert.Equal(t, 1, c.Active())
+	assert.Equal(t, 1, c.ActiveNativeHistogram())
 
 	// This will *not* update the series, since there is already newer timestamp.
-	c.UpdateSeries(ls2, ls2.Hash(), now.Add(-1*time.Minute), copyFn)
+	c.UpdateSeries(ls2, ls2.Hash(), now.Add(-1*time.Minute), true, copyFn)
 	c.Purge(now)
 
 	assert.Equal(t, 1, c.Active())
+	assert.Equal(t, 1, c.ActiveNativeHistogram())
 }
 
 var activeSeriesTestGoroutines = []int{50, 100, 500}
@@ -121,7 +129,7 @@ func benchmarkActiveSeriesConcurrencySingleSeries(b *testing.B, goroutines int)
 
 			for ix := 0; ix < max; ix++ {
 				now = now.Add(time.Duration(ix) * time.Millisecond)
-				c.UpdateSeries(series, labelhash, now, copyFn)
+				c.UpdateSeries(series, labelhash, now, false, copyFn)
 			}
 		}()
 	}
@@ -152,7 +160,7 @@ func BenchmarkActiveSeries_UpdateSeries(b *testing.B) {
 
 	b.ResetTimer()
 	for ix := 0; ix < b.N; ix++ {
-		c.UpdateSeries(series[ix], labelhash[ix], time.Unix(0, now+int64(ix)), copyFn)
+		c.UpdateSeries(series[ix], labelhash[ix], time.Unix(0, now+int64(ix)), false, copyFn)
 	}
 }
 
@@ -184,9 +192,9 @@ func benchmarkPurge(b *testing.B, twice bool) {
 		// Prepare series
 		for ix, s := range series {
 			if ix < numExpiresSeries {
-				c.UpdateSeries(s, labelhash[ix], now.Add(-time.Minute), copyFn)
+				c.UpdateSeries(s, labelhash[ix], now.Add(-time.Minute), false, copyFn)
 			} else {
-				c.UpdateSeries(s, labelhash[ix], now, copyFn)
+				c.UpdateSeries(s, labelhash[ix], now, false, copyFn)
 			}
 		}
 

pkg/ingester/ingester.go

@@ -1038,6 +1038,7 @@ func (i *Ingester) updateActiveSeries(ctx context.Context) {
 
 		userDB.activeSeries.Purge(purgeTime)
 		i.metrics.activeSeriesPerUser.WithLabelValues(userID).Set(float64(userDB.activeSeries.Active()))
+		i.metrics.activeNHSeriesPerUser.WithLabelValues(userID).Set(float64(userDB.activeSeries.ActiveNativeHistogram()))
 		if err := userDB.labelSetCounter.UpdateMetric(ctx, userDB, i.metrics); err != nil {
 			level.Warn(i.logger).Log("msg", "failed to update per labelSet metrics", "user", userID, "err", err)
 		}
@@ -1376,9 +1377,11 @@ func (i *Ingester) Push(ctx context.Context, req *cortexpb.WriteRequest) (*corte
 		} else {
 			discardedNativeHistogramCount += len(ts.Histograms)
 		}
-		shouldUpdateSeries := (succeededSamplesCount > oldSucceededSamplesCount) || (succeededHistogramsCount > oldSucceededHistogramsCount)
+
+		isNHAppended := succeededHistogramsCount > oldSucceededHistogramsCount
+		shouldUpdateSeries := (succeededSamplesCount > oldSucceededSamplesCount) || isNHAppended
 		if i.cfg.ActiveSeriesMetricsEnabled && shouldUpdateSeries {
-			db.activeSeries.UpdateSeries(tsLabels, tsLabelsHash, startAppend, func(l labels.Labels) labels.Labels {
+			db.activeSeries.UpdateSeries(tsLabels, tsLabelsHash, startAppend, isNHAppended, func(l labels.Labels) labels.Labels {
 				// we must already have copied the labels if succeededSamplesCount or succeededHistogramsCount has been incremented.
 				return copiedLabels
 			})
@@ -2526,6 +2529,7 @@ func (i *Ingester) closeAllTSDB() {
 
 			i.metrics.memUsers.Dec()
 			i.metrics.activeSeriesPerUser.DeleteLabelValues(userID)
+			i.metrics.activeNHSeriesPerUser.DeleteLabelValues(userID)
 		}(userDB)
 	}