Uptime

Move the targets your company should see to the External view and switch on publishing. The dashboard sends them to uptime.dtrvantage.com on a cadence you set; the portal checks them from the internet on that cadence, from its own public address, and hands the results back, so the External view shows what the world sees rather than what your server sees, and every row says who checked it and from which address. The portal serves the same targets at a status link made for that installation: state, latency, the 24-hour figure and the week's changes, readable with no sign-in. Nobody signs up: the licence is the credential, and only a licence that carries the Uptime module can publish.

• Off by default. Publishing is a timed contact with the portal made only after an administrator switches it on; a result from outside that stops arriving is a grey dot with the minutes, never the last colour.
• The link rotates. Daily by default, settable on the same card (or never); a link replaced on schedule keeps working for an hour so a page open at the minute is not cut off. Rotate by hand kills the old one at once.
• Nothing else leaves. Only the external targets go, with their state, latency and figures; the internal list stays inside.