1. 修复命中缓存策略后，缓存上传的处理逻辑

2. 支持新版本的FieldStat的Histogram输出

plugin/business/pangu-http/src/pangu_web_cache.h

@@ -4,15 +4,7 @@
 #include <tfe_future.h>
 #include <MESA/Maat_rule.h>
 
-enum cache_query_status
-{
-	WEB_CACHE_BEFORE_QUERY=0,
-	WEB_CACHE_NOT_APPLICABLE,
-	WEB_CACHE_NEED_VERIFY,
-	WEB_CACHE_QUERY_DATA,
-	WEB_CACHE_MISS,
-	WEB_CACHE_HIT
-};
+
 struct cache_handle;
 struct cache_handle* create_web_cache_handle(const char* profile_path, const char* section, 
 													struct event_base* gc_evbase, Maat_feather_t feather, void *logger);
@@ -49,6 +41,7 @@ enum cache_pending_result
 	PENDING_RESULT_FOBIDDEN,
 	PENDING_RESULT_REVALIDATE,
 	PENDING_RESULT_ALLOWED,
+	PENDING_RESULT_HIT,
 	PENDING_RESULT_MISS
 };
 struct cache_mid;