The issue isn’t Google being down, it is my ISP’s connection to Google that might be subpar.
They might have a direct peering which is down and unexpected traffic is flowing though transit, you got BGP flaps, you got local CDN outages... and in the eyes of the customer your website is down, not Google CDN.
They might have a direct peering which is down and unexpected traffic is flowing though transit, you got BGP flaps, you got local CDN outages... and in the eyes of the customer your website is down, not Google CDN.