fix(redis scaler): use literal command names in Lua script for Alibaba Cloud compatibility

CHANGELOG.md

@@ -123,6 +123,7 @@ To learn more about active deprecations, we recommend checking [GitHub Discussio
 - **Pulsar Scaler**: Drop bearer/basic auth headers on redirects to a different host or on https->http downgrades to prevent credential leakage ([#7686](https://github.com/kedacore/keda/issues/7686))
 - **RabbitMQ Scaler**: Fix AMQP connection leak by recovering channels on the existing connection and closing connections properly ([#6266](https://github.com/kedacore/keda/issues/6266))
 - **RabbitMQ Scaler**: Use SASL EXTERNAL for RabbitMQ AMQP TLS without credentials ([#6840](https://github.com/kedacore/keda/issues/6840))
+- **Redis Scaler**: Use literal command names in Lua script to fix compatibility with Alibaba Cloud Redis Cluster ([#7758](https://github.com/kedacore/keda/issues/7758))
 - **Solace Scaler**: Fix URL escaping for Message VPN and Queue names ([#7481](https://github.com/kedacore/keda/pull/7481))
 - **Solr Scaler**: Use net/url to safely encode query parameters ([#7467](https://github.com/kedacore/keda/pull/7467))
 

pkg/scalers/redis_scaler.go

@@ -123,15 +123,17 @@ func NewRedisScaler(ctx context.Context, isClustered, isSentinel bool, config *s
 	luaScript := `
 		local listName = KEYS[1]
 		local listType = redis.call('type', listName).ok
-		local cmd = {
-			zset = 'zcard',
-			set = 'scard',
-			list = 'llen',
-			hash = 'hlen',
-			none = 'llen'
-		}
-
-		return redis.call(cmd[listType], listName)
+		if listType == 'zset' then
+			return redis.call('zcard', listName)
+		elseif listType == 'set' then
+			return redis.call('scard', listName)
+		elseif listType == 'hash' then
+			return redis.call('hlen', listName)
+		elseif listType == 'list' or listType == 'none' then
+			return redis.call('llen', listName)
+		else
+			return redis.error_reply('ERR unsupported key type: ' .. listType)
+		end
 	`
 
 	metricType, err := GetMetricTargetType(config)