Let's Encrypt 64-day certs: your Azure renewal audit
Let's Encrypt will issue 64-day certificates by default from 10 February 2027, flips its staging environment on 14 October 2026, and drops to 45 days with seven-hour authorization reuse in 2028. On Azure that touches certbot on VMs, cert-manager on AKS and Key Vault pipelines feeding Front Door and Application Gateway, where fixed renewal schedules and absolute monitoring thresholds need to become relative.