Add max_idle_connections_per_host to config (#35365)

pkg/models/datasource_cache.go

@@ -167,6 +167,7 @@ func (ds *DataSource) GetHttpTransport() (*dataSourceTransport, error) {
 		TLSHandshakeTimeout:   time.Duration(setting.DataProxyTLSHandshakeTimeout) * time.Second,
 		ExpectContinueTimeout: time.Duration(setting.DataProxyExpectContinueTimeout) * time.Second,
 		MaxIdleConns:          setting.DataProxyMaxIdleConns,
+		MaxConnsPerHost:       setting.DataProxyMaxIdleConnsPerHost,
 		IdleConnTimeout:       time.Duration(setting.DataProxyIdleConnTimeout) * time.Second,
 	}