how do you support certificate pinning? We've enabled by request of our security department certificate pinning for authority X3 and X4. Suddenly tons of users are reporting issues, now I see you have switched to R3 and there will be R4 at some time.
Is there any channel we can subscribe to get the notification ahead of time?
On your page ( https://letsencrypt.org/certificates/ )I see upcoming, but it does not says when from.