Let's Encrypt's 90-minute wobble became 'it's down all day' — its director stepped in (letsencrypt.status.io)
Issuance kept working through the incident; upstream networking caused a higher error rate for ~90 minutes, and most requests still succeeded even then. The original HN title implied a day-long outage.
What the thread actually surfaced is the real anxiety underneath: one nonprofit quietly issues TLS certificates for a huge slice of the web, and it's pushing ever-shorter expiry windows that leave less slack when it stumbles.