--- title: "Monitoring guides: servers, cron jobs, agents | Sentinely" description: "Practical guides from Sentinely on heartbeat monitoring for cron jobs and AI agents, uptime checks, and monitoring Linux servers and Docker hosts." url: https://sentinely.app/blog --- # Practical guides to catching silent failures Step-by-step monitoring for Linux servers, Docker hosts, cron jobs and AI agents, written for the people who get paged. [Linux serversDec 16, 20252 min read ## How to monitor Debian 12 server performance Monitor CPU, memory, disk and services on Debian 12 Bookworm, comparing a Prometheus and Grafana stack with the one-command Sentinely agent install. Read the guide](https://sentinely.app/blog/monitor-debian-12-performance) [DockerDec 16, 20252 min read ## How to monitor Docker on a Hetzner VPS Hetzner's console only shows whole-VPS graphs. Monitor a Docker host on Hetzner with host metrics, uptime checks and heartbeats, without Prometheus. Read the guide](https://sentinely.app/blog/monitor-docker-hetzner) [Linux serversDec 16, 20253 min read ## How to monitor Node.js on a DigitalOcean Droplet Go beyond the basic Droplet graphs: monitor the host, uptime and background jobs behind your Node.js app on DigitalOcean, with alerts that reach you. Read the guide](https://sentinely.app/blog/monitor-nodejs-digitalocean) Agent Pulse ## Know when a cron job quietly stops running Add one line to the end of a job. If the check-in doesn't arrive, you hear about it. crontab ``` 0 3 * * * /backup.sh && curl -fsS https://sentinely.app/api/beat/ ``` [See how it works](https://sentinely.app/agent-pulse) [Linux serversDec 16, 20252 min read ## How to monitor Ubuntu 22.04 server performance Monitor CPU, memory, disk and services on an Ubuntu 22.04 LTS server, from a manual Prometheus and Grafana setup to the one-command Sentinely agent. Read the guide](https://sentinely.app/blog/monitor-ubuntu-22-04-performance) [Linux serversDec 16, 20252 min read ## How to monitor Ubuntu 24.04 server performance Track CPU, memory, disk I/O and services on Ubuntu 24.04, comparing a Prometheus and Grafana stack with the one-command Sentinely agent install. Read the guide](https://sentinely.app/blog/monitor-ubuntu-24-04-performance) [ComparisonsMay 3, 20245 min read ## Datadog vs Sentinely for small-team monitoring An honest comparison of Datadog and Sentinely for small teams: what each one covers, what Sentinely does not do, and how flat pricing compares in practice. Read the guide](https://sentinely.app/blog/why-sentinely-is-better-than-datadog) [DockerJan 26, 20242 min read ## Monitor a Docker host on Raspberry Pi Monitor a Raspberry Pi running Docker: host CPU, memory, disk and network with the ARM64 Sentinely agent, plus uptime checks and heartbeats for containers. Read the guide](https://sentinely.app/blog/monitor-docker-containers-on-raspberry-pi-with-sentinely)