You asked about Monitoring
Nobody in the register described anything this way.
| Launched | What it was | Today |
|---|---|---|
| 2010-06-01 | Real-time visibility into critical apps and services all in one place. · pagerduty.com | acquired |
| 2019-01-01 | YCMemfault First IoT reliability platform for debugging, monitoring, OTA updates · memfault.com | acquired |
| 2015-01-01 | Remote patient monitoring for lung disease patients. · spirehealth.com | acquired |
| 2023-01-01 | The open source, fullstack monitoring platform: stop guessing why… · highlight.io | acquired |
| 2023-01-01 | YCKeep The open-source AIOps platform · keephq.dev | acquired |
| 2015-06-01 | YCConvox Open-source tools for deploying, managing, and monitoring cloud… · convox.com | acquired |
| 2025-06-01 | Implantable microchips and AI for cattle monitoring · nexa.farm | acquired |
| 2015-06-01 | Appcanary tracks the dependencies you use in your apps and servers… · appcanary.com | acquired |
| 2013-06-01 | The best way to communicate with users around downtime. · statuspage.io | acquired |
How this compares
The register re-probes every domain it holds. Some that answered last month stop answering. We send that list — what went quiet, and what it was — once a month. Nothing else.
How this was made. Show HN entries are every post from 2021 to 2023 with at least five points that linked to its own domain; code hosts and free hosting are excluded, because a repository outlives the effort behind it. Product Hunt entries needed 100 votes — a far higher bar, so they are the promoted top slice rather than a like-for-like sample. Both are judged by asking the domain whether it still answers: gone means it no longer resolves, refuses the connection, serves a parking page, or says plainly that it shut down. An HTTP error is not counted as gone — a server answering 404 is one somebody still pays for, and an audit of 25 gone-calls found two such sites alive with only a moved homepage. Y Combinator entries use the status YC publishes itself, which is why only those can say acquired. Squatted domains — a lapsed name now serving somebody else's site — are not detected, so these figures run slightly low.