UpSlimUptime monitoring that stays out of your way

Minimal Rust server for monitoring HTTP endpoints and TCP services. Configures in minutes, runs anywhere, alerts on Slack.

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Written in Rust

1.9 MB Docker image. 1.2 MB RAM at rest. No runtime dependencies, no GC pauses, no surprises.

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Each monitor is a dormant Tokio task. Scaling from 50 to 100 monitors adds under 0.1 MB. CPU stays below 0.65% even under full load.

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Single file or directory of files. Supports ${ENV_VAR} substitution. No database, no UI, no magic.

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Configurable failure and recovery thresholds. Optional reminder intervals. Sends only when state actually changes.

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Multi-stage build produces a scratch image with only the binary and CA certificates. Works on amd64 and arm64.

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Slack built-in. Provider trait designed for adding PagerDuty, email, webhooks, and more.