fix(blooms): Fix a regression introduced with #12774 (#12776)

This PR fixes a regression introduced with #12774 where series where wrongly identified as "skipped" even though there were part of blocks.

Signed-off-by: Christian Haudum <christian.haudum@gmail.com>

pkg/bloomgateway/querier.go

@@ -22,6 +22,7 @@ type querierMetrics struct {
 	chunksFiltered prometheus.Counter
 	seriesTotal    prometheus.Counter
 	seriesFiltered prometheus.Counter
+	seriesSkipped  prometheus.Counter
 }
 
 func newQuerierMetrics(registerer prometheus.Registerer, namespace, subsystem string) *querierMetrics {
@@ -50,6 +51,12 @@ func newQuerierMetrics(registerer prometheus.Registerer, namespace, subsystem st
 			Name:      "series_filtered_total",
 			Help:      "Total amount of series that have been filtered out. Does not count series in failed requests.",
 		}),
+		seriesSkipped: promauto.With(registerer).NewCounter(prometheus.CounterOpts{
+			Namespace: namespace,
+			Subsystem: subsystem,
+			Name:      "series_skipped_total",
+			Help:      "Total amount of series that have been skipped and returned unfiltered, because no block matched the series.",
+		}),
 	}
 }
 
@@ -114,6 +121,7 @@ func (bq *BloomQuerier) FilterChunkRefs(ctx context.Context, tenant string, from
 			"series", len(s.series),
 			"chunks", chunks,
 			"blocks", len(blocks),
+			"skipped", len(skipped),
 		)
 
 		refs, err := bq.c.FilterChunks(ctx, tenant, s.interval, blocks, queryPlan)
@@ -123,6 +131,7 @@ func (bq *BloomQuerier) FilterChunkRefs(ctx context.Context, tenant string, from
 
 		// add chunk refs from series that were not mapped to any blocks
 		refs = append(refs, skipped...)
+		bq.metrics.seriesSkipped.Add(float64(len(skipped)))
 
 		for i := range refs {
 			seriesSeen[refs[i].Fingerprint] = struct{}{}

pkg/bloomgateway/resolver.go

@@ -110,14 +110,14 @@ func unassignedSeries(mapped []blockWithSeries, series []*logproto.GroupedChunkR
 		})
 
 		maxIdx := sort.Search(len(skipped), func(i int) bool {
-			return skipped[i].Fingerprint >= maxFp.Fingerprint
+			return skipped[i].Fingerprint > maxFp.Fingerprint
 		})
 
 		if minIdx == len(skipped) || maxIdx == 0 || minIdx == maxIdx {
 			continue
 		}
 
-		skipped = append(skipped[0:minIdx], skipped[maxIdx+1:]...)
+		skipped = append(skipped[0:minIdx], skipped[maxIdx:]...)
 	}
 
 	return skipped

pkg/bloomgateway/resolver_test.go

@@ -242,12 +242,34 @@ func TestBlockResolver_UnassignedSeries(t *testing.T) {
 				{Fingerprint: 0xe0},
 			},
 		},
+		{
+			desc: "block overlapping single remaining series",
+			mapped: []blockWithSeries{
+				{
+					series: []*logproto.GroupedChunkRefs{
+						{Fingerprint: 0x00},
+						{Fingerprint: 0x20},
+						{Fingerprint: 0x40},
+						{Fingerprint: 0x60},
+						{Fingerprint: 0x80},
+						{Fingerprint: 0xa0},
+						{Fingerprint: 0xc0},
+					},
+				},
+				{
+					series: []*logproto.GroupedChunkRefs{
+						{Fingerprint: 0xe0},
+					},
+				},
+			},
+			expected: []*logproto.GroupedChunkRefs{},
+		},
 	}
 
 	for _, tc := range testCases {
 		t.Run(tc.desc, func(t *testing.T) {
 			result := unassignedSeries(tc.mapped, series)
-			require.Equal(t, result, tc.expected)
+			require.Equal(t, tc.expected, result)
 		})
 	}
 }