DIY monitoring: $ curl https://example.com -vI --stderr - | grep "expire date" *...

		sltr 6 months ago \| parent \| context \| favorite \| on: LetsEncrypt – Expiration Notification Service Has ... DIY monitoring: `$ curl https://example.com -vI --stderr - \| grep "expire date" * expire date: Jan 15 23:59:59 2026 GMT`