Today suddenly my admin dashboard chart is not visible.
Live and Test websites are on different server and suddenly today it's broken.
I have check in log file and found that
[2019-03-19 05:51:17] main.CRITICAL: Unable to read response, or response is empty {"exception":"[object] (Zend_Http_Client_Exception(code: 0): Unable to read response, or response is empty at /vendor/magento/zendframework1/library/Zend/Http/Client.php:1093)"} []
EDIT
My problem is suddenly fixed automatically,google chart is enable now