+1 for Uptime Kuma, I use it with ntfy. If OP doesn’t want a self hosted solution, there’s UptimeRobot - essentially SAAS Uptime Kuma, but with a free tier.

Forgejo + Tailscale. Forgejo is the app behind Codeberg so it’s battle tested. I switched to it from Gitea after the controversy.

Yes - Electron makes some sense in a world where developer effort is expensive and memory is cheap. Perhaps the inverse of that situation will encourage more interest native apps.

Forgejo - actively developed open source. It’s what powers Codeberg. Easy to set up and manage with Docker. I moved to it from Gogs and skipped Gitea after reading about the forks.