fix: Add flags for path & configure kafka for non-memberlist kv store (#14850)

docs/sources/shared/configuration.md

@@ -1620,6 +1620,8 @@ The `chunk_store_config` block configures how chunks will be cached and how long
 Common configuration to be shared between multiple modules. If a more specific configuration is given in other sections, the related configuration within this section will be ignored.
 
 ```yaml
+# prefix for the path
+# CLI flag: -common.path-prefix
 [path_prefix: <string> | default = ""]
 
 storage:

pkg/loki/common/common.go

@@ -66,6 +66,7 @@ func (c *Config) RegisterFlags(f *flag.FlagSet) {
 
 	f.StringVar(&c.CompactorAddress, "common.compactor-address", "", "the http address of the compactor in the form http://host:port")
 	f.StringVar(&c.CompactorGRPCAddress, "common.compactor-grpc-address", "", "the grpc address of the compactor in the form host:port")
+	f.StringVar(&c.PathPrefix, "common.path-prefix", "", "prefix for the path")
 }
 
 type Storage struct {

pkg/loki/config_wrapper.go

@@ -244,6 +244,7 @@ func applyConfigToRings(r, defaults *ConfigWrapper, rc lokiring.RingConfig, merg
 		r.Ingester.LifecyclerConfig.Zone = rc.InstanceZone
 		r.Ingester.LifecyclerConfig.ListenPort = rc.ListenPort
 		r.Ingester.LifecyclerConfig.ObservePeriod = rc.ObservePeriod
+		r.Ingester.KafkaIngestion.PartitionRingConfig.KVStore = rc.KVStore
 	}
 
 	if mergeWithExisting {