endpoint_uptime.csv automated monitoring

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Filippo Valsorda

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Oct 20, 2025, 8:54:39 AM10/20/25
to Certificate Transparency Policy
Hello fellow mortals,

We realized we didn't have an automated way of being notified of log downtime as observed by Google, so we built a little service that checks https://www.gstatic.com/ct/compliance/endpoint_uptime.csv for us.

https://ct-uptime-alerts.fly.dev/geomys.org will return a 503 if any lines matching "geomys.org" have an uptime column below 99.95. We pointed our alerting service at it.

You can use it with any filter string, and it also takes a parameter like "?threshold=99.8". You're welcome to use our instance (no guarantees!), or you can run your own: https://github.com/FiloSottile/mostly-harmless/tree/main/ct-uptime-alerts

Cheers,
Filippo

Filippo Valsorda

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Mar 27, 2026, 5:48:33 PMMar 27
to Certificate Transparency Policy
Hello fellow 21st century endurers,

With the introduction of https://www.gstatic.com/ct/compliance/endpoint_uptime_24h.csv, we updated what used to be https://ct-uptime-alerts.fly.dev to use the 24h source and moved it to https://uptime.geomys.org/ct/. It otherwise works exactly the same.

We will be turning off https://ct-uptime-alerts.fly.dev in a month, please migrate off it and to https://uptime.geomys.org/ct/ (or self-host an instance).

Cheers,
Filippo
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Filippo Valsorda

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Jun 5, 2026, 5:57:33 AMJun 5
to Certificate Transparency Policy
2026-03-27 22:48 GMT+01:00 Filippo Valsorda <fil...@ml.filippo.io>:
Hello fellow 21st century endurers,

With the introduction of https://www.gstatic.com/ct/compliance/endpoint_uptime_24h.csv, we updated what used to be https://ct-uptime-alerts.fly.dev to use the 24h source and moved it to https://uptime.geomys.org/ct/. It otherwise works exactly the same.

We will be turning off https://ct-uptime-alerts.fly.dev in a month, please migrate off it and to https://uptime.geomys.org/ct/ (or self-host an instance).

https://ct-uptime-alerts.fly.dev has now been turned off.

We also changed the default thresholds of https://uptime.geomys.org/ct/ to 95 for add-chain and add-pre-chain, and 99 for the other endpoints, to avoid alerting on a single failed request.

Cheers,
Filippo

2025-10-20 05:54 GMT-07:00 Filippo Valsorda <fil...@ml.filippo.io>:
Hello fellow mortals,

We realized we didn't have an automated way of being notified of log downtime as observed by Google, so we built a little service that checks https://www.gstatic.com/ct/compliance/endpoint_uptime.csv for us.

https://ct-uptime-alerts.fly.dev/geomys.org will return a 503 if any lines matching "geomys.org" have an uptime column below 99.95. We pointed our alerting service at it.

You can use it with any filter string, and it also takes a parameter like "?threshold=99.8". You're welcome to use our instance (no guarantees!), or you can run your own: https://github.com/FiloSottile/mostly-harmless/tree/main/ct-uptime-alerts

Cheers,
Filippo


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