Roland Shoemaker sent a proposal a while back for ACME Renewal Info (ARI) with the goal of solving both "impending revocation" and "expressing suggested renewal times." https://mailarchive.ietf.org/arch/msg/acme/b-RddSX8TdGYvO3f9c7Lzg6I2I4/. We at Let's Encrypt hope to develop this idea further and implement it soon.
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