register_metrics updated to add STORE_BEACON_STATE_CACHE_MEMORY_SIZE

Author: PoulavBhowmick03

beacon_node/store/src/hot_cold_store.rs

@@ -503,6 +503,10 @@ impl<E: EthSpec, Hot: ItemStore<E>, Cold: ItemStore<E>> HotColdDB<E, Hot, Cold>
             &metrics::STORE_BEACON_STATE_CACHE_SIZE,
             state_cache.len() as i64,
         );
+        metrics::set_gauge(
+            &metrics::STORE_BEACON_STATE_CACHE_MEMORY_SIZE,
+            state_cache.cached_bytes() as i64,
+        );
         metrics::set_gauge_vec(
             &metrics::STORE_BEACON_HDIFF_BUFFER_CACHE_SIZE,
             HOT_METRIC,