We would like to draw your attention to following changes occurring in the 1.91 Acquia Cloud release.

Changes to monitoring of ephemeral storage and site availability

In the 1.91 Acquia Cloud release, Acquia begins automatically alerting on and mitigating situations when a site fills ephemeral disk storage and it becomes critical to site availability.

When these alerts occur, our systems will proactively:

As part of our ongoing efforts to ensure that both the Acquia platform and your websites remain reliable and secure, Acquia is restricting sshd_configs to allow only secure Key Exchange Algorithms (KexAlgorithms) in the Acquia Cloud 1.90 release.

Starting with version 1.90, all Acquia Cloud users that use SSH to connect to their site environments must have SSH keys with 2048-bit encryption or greater.

Versions of Acquia Cloud that were released prior to version 1.90 (including the 1.89 version) allow users to use SSH keys with less than 2048-bit encryption.