Magento have recently released Admin Dashboard Charts Patch
You can use these steps to update this patch manually
Steps to install Admin Dashboard Charts Patch in your store
Step 1: Download the patch from https://magento.com/tech-resources/download -> Release Archive. You can download it after login with registered email id.
Step 2: open file MPERF-10509-CE-2019-03-13-06-31-24.diff which you get after download in your code editor e.g. sublime text.
Step 3: There is
Step 4: Open the file in
– const API_URL = ‘http://chart.apis.google.com/chart’; –Remove
+ const API_URL = ‘https://image-charts.com/chart’; –Add
Step 5: Now save the file. Then flush the cache. Then the change is deflected in admin dashboard.