chore(cache): Make exprimental messages more clear for cache. (#6219)

Currently we see following message when any of the experimental feature is used for cache (say fifocache or redis).
But the problem it doesn't say __what_kind__ of cache is it exactly.

So this leads to confusion to track what kind of cache is the source of the experiment feature.

This PR fixes it by adding more clear message.

Signed-off-by: Kaviraj <kavirajkanagaraj@gmail.com>

pkg/storage/chunk/cache/fifo_cache.go

@@ -4,6 +4,7 @@ import (
 	"container/list"
 	"context"
 	"flag"
+	"fmt"
 	"sync"
 	"time"
 	"unsafe"
@@ -98,7 +99,7 @@ type cacheEntry struct {
 
 // NewFifoCache returns a new initialised FifoCache of size.
 func NewFifoCache(name string, cfg FifoCacheConfig, reg prometheus.Registerer, logger log.Logger) *FifoCache {
-	util_log.WarnExperimentalUse("In-memory (FIFO) cache", logger)
+	util_log.WarnExperimentalUse(fmt.Sprintf("In-memory (FIFO) cache - %s", name), logger)
 
 	if cfg.DeprecatedSize > 0 {
 		flagext.DeprecatedFlagsUsed.Inc()

pkg/storage/chunk/cache/redis_cache.go

@@ -2,6 +2,7 @@ package cache
 
 import (
 	"context"
+	"fmt"
 
 	"github.com/go-kit/log"
 	"github.com/go-kit/log/level"
@@ -18,7 +19,7 @@ type RedisCache struct {
 
 // NewRedisCache creates a new RedisCache
 func NewRedisCache(name string, redisClient *RedisClient, logger log.Logger) *RedisCache {
-	util_log.WarnExperimentalUse("Redis cache", logger)
+	util_log.WarnExperimentalUse(fmt.Sprintf("Redis cache - %s", name), logger)
 	cache := &RedisCache{
 		name:   name,
 		redis:  redisClient,