tsdb: remove unused option (#13282)

Digging around the TSDB code and I've found that this flag is unused so
let's remove it.

Signed-off-by: Giedrius Statkevičius <giedrius.statkevicius@vinted.com>

cmd/prometheus/main.go

@@ -1597,7 +1597,6 @@ func (opts tsdbOptions) ToTSDBOptions() tsdb.Options {
 		RetentionDuration:              int64(time.Duration(opts.RetentionDuration) / time.Millisecond),
 		MaxBytes:                       int64(opts.MaxBytes),
 		NoLockfile:                     opts.NoLockfile,
-		AllowOverlappingCompaction:     true,
 		WALCompression:                 wlog.ParseCompressionType(opts.WALCompression, opts.WALCompressionType),
 		HeadChunksWriteQueueSize:       opts.HeadChunksWriteQueueSize,
 		SamplesPerChunk:                opts.SamplesPerChunk,

tsdb/db.go

@@ -70,20 +70,19 @@ var ErrNotReady = errors.New("TSDB not ready")
 // millisecond precision timestamps.
 func DefaultOptions() *Options {
 	return &Options{
-		WALSegmentSize:             wlog.DefaultSegmentSize,
-		MaxBlockChunkSegmentSize:   chunks.DefaultChunkSegmentSize,
-		RetentionDuration:          int64(15 * 24 * time.Hour / time.Millisecond),
-		MinBlockDuration:           DefaultBlockDuration,
-		MaxBlockDuration:           DefaultBlockDuration,
-		NoLockfile:                 false,
-		AllowOverlappingCompaction: true,
-		SamplesPerChunk:            DefaultSamplesPerChunk,
-		WALCompression:             wlog.CompressionNone,
-		StripeSize:                 DefaultStripeSize,
-		HeadChunksWriteBufferSize:  chunks.DefaultWriteBufferSize,
-		IsolationDisabled:          defaultIsolationDisabled,
-		HeadChunksWriteQueueSize:   chunks.DefaultWriteQueueSize,
-		OutOfOrderCapMax:           DefaultOutOfOrderCapMax,
+		WALSegmentSize:            wlog.DefaultSegmentSize,
+		MaxBlockChunkSegmentSize:  chunks.DefaultChunkSegmentSize,
+		RetentionDuration:         int64(15 * 24 * time.Hour / time.Millisecond),
+		MinBlockDuration:          DefaultBlockDuration,
+		MaxBlockDuration:          DefaultBlockDuration,
+		NoLockfile:                false,
+		SamplesPerChunk:           DefaultSamplesPerChunk,
+		WALCompression:            wlog.CompressionNone,
+		StripeSize:                DefaultStripeSize,
+		HeadChunksWriteBufferSize: chunks.DefaultWriteBufferSize,
+		IsolationDisabled:         defaultIsolationDisabled,
+		HeadChunksWriteQueueSize:  chunks.DefaultWriteQueueSize,
+		OutOfOrderCapMax:          DefaultOutOfOrderCapMax,
 	}
 }
 
@@ -115,14 +114,6 @@ type Options struct {
 	// NoLockfile disables creation and consideration of a lock file.
 	NoLockfile bool
 
-	// Compaction of overlapping blocks are allowed if AllowOverlappingCompaction is true.
-	// This is an optional flag for overlapping blocks.
-	// The reason why this flag exists is because there are various users of the TSDB
-	// that do not want vertical compaction happening on ingest time. Instead,
-	// they'd rather keep overlapping blocks and let another component do the overlapping compaction later.
-	// For Prometheus, this will always be true.
-	AllowOverlappingCompaction bool
-
 	// WALCompression configures the compression type to use on records in the WAL.
 	WALCompression wlog.CompressionType
 

tsdb/db_test.go

@@ -4877,7 +4877,6 @@ func Test_Querier_OOOQuery(t *testing.T) {
 	opts := DefaultOptions()
 	opts.OutOfOrderCapMax = 30
 	opts.OutOfOrderTimeWindow = 24 * time.Hour.Milliseconds()
-	opts.AllowOverlappingCompaction = false
 
 	series1 := labels.FromStrings("foo", "bar1")
 
@@ -4962,7 +4961,6 @@ func Test_ChunkQuerier_OOOQuery(t *testing.T) {
 	opts := DefaultOptions()
 	opts.OutOfOrderCapMax = 30
 	opts.OutOfOrderTimeWindow = 24 * time.Hour.Milliseconds()
-	opts.AllowOverlappingCompaction = false
 
 	series1 := labels.FromStrings("foo", "bar1")
 
@@ -6646,7 +6644,6 @@ func TestQueryHistogramFromBlocksWithCompaction(t *testing.T) {
 		t.Helper()
 
 		opts := DefaultOptions()
-		opts.AllowOverlappingCompaction = true // TODO(jesusvazquez): This replaced AllowOverlappingBlocks, make sure that works.
 		db := openTestDB(t, opts, nil)
 		t.Cleanup(func() {
 			require.NoError(t, db.Close())