I am happy to introduce the witness.navigli.sunlight.geomys.org staging witness. It replaces the experimental navigli.sunlight.geomys.org/dev testing witness.
P.S. In order to have something meaningful to point uptime monitoring at, I built a little service that submits a checkpoint to a witness and returns 200 OK only if the returned signature is fresh and valid. You are welcome to use it to monitor your own witnesses.
https://ct-uptime-alerts.fly.dev/witness/