chore: Call `shardstreams.Config` by value instead of by reference (#12915)

Use `shardstreams.Config` by value instead of by reference to fix docs generation.
Our `docs-generator` tool relies on the struct address/references to assume that flags are present. Using this config by value fixes it.

docs/sources/shared/configuration.md

@@ -3305,12 +3305,22 @@ ruler_remote_write_sigv4_config:
 # Deprecated: Use deletion_mode per tenant configuration instead.
 [allow_deletes: <boolean>]
 
+# Define streams sharding behavior.
 shard_streams:
-  [enabled: <boolean>]
+  # Automatically shard streams to keep them under the per-stream rate limit.
+  # Sharding is dictated by the desired rate.
+  # CLI flag: -shard-streams.enabled
+  [enabled: <boolean> | default = true]
 
-  [logging_enabled: <boolean>]
+  # Whether to log sharding streams behavior or not. Not recommended for
+  # production environments.
+  # CLI flag: -shard-streams.logging-enabled
+  [logging_enabled: <boolean> | default = false]
 
-  [desired_rate: <int>]
+  # Threshold used to cut a new shard. Default (1536KB) means if a rate is above
+  # 1536KB/s, it will be sharded into two streams.
+  # CLI flag: -shard-streams.desired-rate
+  [desired_rate: <int> | default = 1536KB]
 
 [blocked_queries: <blocked_query...>]
 

pkg/distributor/distributor.go

@@ -589,7 +589,7 @@ func (d *Distributor) shardStream(stream logproto.Stream, pushSize int, tenantID
 	return d.divideEntriesBetweenShards(tenantID, shardCount, shardStreamsCfg, stream)
 }
 
-func (d *Distributor) divideEntriesBetweenShards(tenantID string, totalShards int, shardStreamsCfg *shardstreams.Config, stream logproto.Stream) []KeyedStream {
+func (d *Distributor) divideEntriesBetweenShards(tenantID string, totalShards int, shardStreamsCfg shardstreams.Config, stream logproto.Stream) []KeyedStream {
 	derivedStreams := d.createShards(stream, totalShards, tenantID, shardStreamsCfg)
 
 	for i := 0; i < len(stream.Entries); i++ {
@@ -601,7 +601,7 @@ func (d *Distributor) divideEntriesBetweenShards(tenantID string, totalShards in
 	return derivedStreams
 }
 
-func (d *Distributor) createShards(stream logproto.Stream, totalShards int, tenantID string, shardStreamsCfg *shardstreams.Config) []KeyedStream {
+func (d *Distributor) createShards(stream logproto.Stream, totalShards int, tenantID string, shardStreamsCfg shardstreams.Config) []KeyedStream {
 	var (
 		streamLabels   = labelTemplate(stream.Labels, d.logger)
 		streamPattern  = streamLabels.String()
@@ -809,7 +809,7 @@ func (d *Distributor) parseStreamLabels(vContext validationContext, key string,
 // based on the rate stored in the rate store and will store the new evaluated number of shards.
 //
 // desiredRate is expected to be given in bytes.
-func (d *Distributor) shardCountFor(logger log.Logger, stream *logproto.Stream, pushSize int, tenantID string, streamShardcfg *shardstreams.Config) int {
+func (d *Distributor) shardCountFor(logger log.Logger, stream *logproto.Stream, pushSize int, tenantID string, streamShardcfg shardstreams.Config) int {
 	if streamShardcfg.DesiredRate.Val() <= 0 {
 		if streamShardcfg.LoggingEnabled {
 			level.Error(logger).Log("msg", "invalid desired rate", "desired_rate", streamShardcfg.DesiredRate.String())

pkg/distributor/limits.go

@@ -25,7 +25,7 @@ type Limits interface {
 	DiscoverServiceName(userID string) []string
 	DiscoverLogLevels(userID string) bool
 
-	ShardStreams(userID string) *shardstreams.Config
+	ShardStreams(userID string) shardstreams.Config
 	IngestionRateStrategy() string
 	IngestionRateBytes(userID string) float64
 	IngestionBurstSizeBytes(userID string) int

pkg/distributor/ratestore_test.go

@@ -341,15 +341,15 @@ type fakeOverrides struct {
 func (c *fakeOverrides) AllByUserID() map[string]*validation.Limits {
 	return map[string]*validation.Limits{
 		"ingester0": {
-			ShardStreams: &shardstreams.Config{
+			ShardStreams: shardstreams.Config{
 				Enabled: c.enabled,
 			},
 		},
 	}
 }
 
-func (c *fakeOverrides) ShardStreams(_ string) *shardstreams.Config {
-	return &shardstreams.Config{
+func (c *fakeOverrides) ShardStreams(_ string) shardstreams.Config {
+	return shardstreams.Config{
 		Enabled: c.enabled,
 	}
 }

pkg/distributor/shardstreams/config.go

@@ -7,12 +7,13 @@ import (
 )
 
 type Config struct {
-	Enabled        bool `yaml:"enabled" json:"enabled"`
-	LoggingEnabled bool `yaml:"logging_enabled" json:"logging_enabled"`
+	Enabled bool `yaml:"enabled" json:"enabled" doc:"description=Automatically shard streams to keep them under the per-stream rate limit. Sharding is dictated by the desired rate."`
+
+	LoggingEnabled bool `yaml:"logging_enabled" json:"logging_enabled" doc:"description=Whether to log sharding streams behavior or not. Not recommended for production environments."`
 
 	// DesiredRate is the threshold used to shard the stream into smaller pieces.
 	// Expected to be in bytes.
-	DesiredRate flagext.ByteSize `yaml:"desired_rate" json:"desired_rate"`
+	DesiredRate flagext.ByteSize `yaml:"desired_rate" json:"desired_rate" doc:"description=Threshold used to cut a new shard. Default (1536KB) means if a rate is above 1536KB/s, it will be sharded into two streams."`
 }
 
 func (cfg *Config) RegisterFlagsWithPrefix(prefix string, fs *flag.FlagSet) {

pkg/ingester/instance_test.go

@@ -1049,7 +1049,7 @@ func (f fakeLimits) AllByUserID() map[string]*validation.Limits {
 
 func TestStreamShardingUsage(t *testing.T) {
 	setupCustomTenantLimit := func(perStreamLimit string) *validation.Limits {
-		shardStreamsCfg := &shardstreams.Config{Enabled: true, LoggingEnabled: true}
+		shardStreamsCfg := shardstreams.Config{Enabled: true, LoggingEnabled: true}
 		shardStreamsCfg.DesiredRate.Set("6MB") //nolint:errcheck
 
 		customTenantLimits := &validation.Limits{}

pkg/ingester/limiter.go

@@ -27,7 +27,7 @@ type Limits interface {
 	MaxLocalStreamsPerUser(userID string) int
 	MaxGlobalStreamsPerUser(userID string) int
 	PerStreamRateLimit(userID string) validation.RateLimit
-	ShardStreams(userID string) *shardstreams.Config
+	ShardStreams(userID string) shardstreams.Config
 }
 
 // Limiter implements primitives to get the maximum number of streams

pkg/loki/loki.go

@@ -97,7 +97,7 @@ type Config struct {
 	CompactorConfig     compactor.Config           `yaml:"compactor,omitempty"`
 	CompactorHTTPClient compactorclient.HTTPConfig `yaml:"compactor_client,omitempty" doc:"hidden"`
 	CompactorGRPCClient compactorclient.GRPCConfig `yaml:"compactor_grpc_client,omitempty"`
-	LimitsConfig        validation.Limits          `yaml:"limits_config,omitempty"`
+	LimitsConfig        validation.Limits          `yaml:"limits_config"`
 	Worker              worker.Config              `yaml:"frontend_worker,omitempty"`
 	TableManager        index.TableManagerConfig   `yaml:"table_manager,omitempty"`
 	MemberlistKV        memberlist.KVConfig        `yaml:"memberlist"`

pkg/validation/limits.go

@@ -187,7 +187,7 @@ type Limits struct {
 	// Deprecated
 	CompactorDeletionEnabled bool `yaml:"allow_deletes" json:"allow_deletes" doc:"deprecated|description=Use deletion_mode per tenant configuration instead."`
 
-	ShardStreams *shardstreams.Config `yaml:"shard_streams" json:"shard_streams"`
+	ShardStreams shardstreams.Config `yaml:"shard_streams" json:"shard_streams" doc:"description=Define streams sharding behavior."`
 
 	BlockedQueries []*validation.BlockedQuery `yaml:"blocked_queries,omitempty" json:"blocked_queries,omitempty"`
 
@@ -388,7 +388,6 @@ func (l *Limits) RegisterFlags(f *flag.FlagSet) {
 		),
 	)
 
-	l.ShardStreams = &shardstreams.Config{}
 	l.ShardStreams.RegisterFlagsWithPrefix("shard-streams", f)
 
 	f.IntVar(&l.VolumeMaxSeries, "limits.volume-max-series", 1000, "The default number of aggregated series or labels that can be returned from a log-volume endpoint")
@@ -900,7 +899,7 @@ func (o *Overrides) DeletionMode(userID string) string {
 	return o.getOverridesForUser(userID).DeletionMode
 }
 
-func (o *Overrides) ShardStreams(userID string) *shardstreams.Config {
+func (o *Overrides) ShardStreams(userID string) shardstreams.Config {
 	return o.getOverridesForUser(userID).ShardStreams
 }