unified-storage: setup ring to shard requests (#103783)

* Updates the instrumentation_server service to use mux instead of the builtin router, and have it store the router in the module server: this is so we can register the /ring endpoint to check the status of the ring
* Create a new Ring service that depends on the instrumentation server and declares it as a dependency for the storage server
* Create standalone MemberlistKV service for Ring service to use
* Update the storage server Search and GetStats handler to distribute requests if applicable

pkg/setting/setting.go

@@ -547,6 +547,11 @@ type Cfg struct {
 	IndexMaxBatchSize           int
 	IndexFileThreshold          int
 	IndexMinCount               int
+	EnableSharding              bool
+	MemberlistBindAddr          string
+	MemberlistAdvertiseAddr     string
+	MemberlistJoinMember        string
+	InstanceID                  string
 	SprinklesApiServer          string
 	SprinklesApiServerPageLimit int
 	CACertPath                  string

pkg/setting/setting_unified_storage.go

@@ -54,6 +54,11 @@ func (cfg *Cfg) setUnifiedStorageConfig() {
 	cfg.IndexPath = section.Key("index_path").String()
 	cfg.IndexWorkers = section.Key("index_workers").MustInt(10)
 	cfg.IndexMaxBatchSize = section.Key("index_max_batch_size").MustInt(100)
+	cfg.EnableSharding = section.Key("enable_sharding").MustBool(false)
+	cfg.MemberlistBindAddr = section.Key("memberlist_bind_addr").String()
+	cfg.MemberlistAdvertiseAddr = section.Key("memberlist_advertise_addr").String()
+	cfg.MemberlistJoinMember = section.Key("memberlist_join_member").String()
+	cfg.InstanceID = section.Key("instance_id").String()
 	cfg.IndexFileThreshold = section.Key("index_file_threshold").MustInt(10)
 	cfg.IndexMinCount = section.Key("index_min_count").MustInt(1)
 	cfg.SprinklesApiServer = section.Key("sprinkles_api_server").String()