refactor(telemetry): 将硬编码的key_count替换为TelemetryConstants中的常量

Author: ZUOXIANGE

src/L2Cache.Abstractions/Telemetry/TelemetryConstants.cs

@@ -58,6 +58,7 @@ public static class TagNames
         public const string KeyPattern = "key_pattern";
         public const string ValueType = "value_type";
         public const string Source = "source";
+        public const string KeyCount = "key_count";
     }
 
     /// <summary>

src/L2Cache/AbstractCacheService.cs

@@ -859,7 +859,7 @@ public virtual async Task<Dictionary<TKey, TValue>> BatchGetAsync(List<TKey> key
             tags:
             [
                 new KeyValuePair<string, object>(TelemetryConstants.TagNames.CacheName, GetCacheName()),
-                new KeyValuePair<string, object>("key_count", keyList.Count)
+                new KeyValuePair<string, object>(TelemetryConstants.TagNames.KeyCount, keyList.Count)
             ]);
 
         var missingKeys = new List<(TKey Key, string FullKey)>();
@@ -946,7 +946,7 @@ public virtual async Task<Dictionary<TKey, TValue>> BatchGetOrLoadAsync(List<TKe
             tags:
             [
                 new KeyValuePair<string, object>(TelemetryConstants.TagNames.CacheName, GetCacheName()),
-                new KeyValuePair<string, object>("key_count", keyList.Count)
+                new KeyValuePair<string, object>(TelemetryConstants.TagNames.KeyCount, keyList.Count)
             ]);
 
         // 1. 尝试批量获取缓存
@@ -1072,7 +1072,7 @@ public virtual async Task<long> BatchEvictAsync(List<TKey> keyList)
             tags:
             [
                 new KeyValuePair<string, object>(TelemetryConstants.TagNames.CacheName, GetCacheName()),
-                new KeyValuePair<string, object>("key_count", keyList.Count)
+                new KeyValuePair<string, object>(TelemetryConstants.TagNames.KeyCount, keyList.Count)
             ]);
 
         // 1. Remove from Local Cache