Monitoring turns invisible server failure into visible signals. Start with simple checks: is the app reachable, is disk filling up, are error rates rising, and will certificates expire soon?
Useful checks:
HTTP uptime check
Disk usage
Memory pressure
Service status
TLS certificate expiry
5xx response rate
TIP
Alerts should be actionable. If nobody knows what to do when an alert fires, improve the runbook or remove the alert.
Without monitoring, a broken server just fails silently until a user complains. Monitoring turns invisible problems into visible signals, so you find out before your users do.
The basics worth watching
Uptime — is the site reachable at all?
Disk usage — is it about to run out of space?
Memory — is it under pressure?
Error rate — are requests suddenly failing more than usual?
TLS certificate expiry — is HTTPS about to break?
Most of these can be checked with a simple external service that pings your site every few minutes, plus basic server metrics.
Make alerts actually useful
TIP
An alert is only good if someone knows what to do when it fires. If an alert goes off and nobody has a clear next step, either write down the response steps (a “runbook”) or remove the alert — a noisy, useless alert just gets ignored, which defeats the whole purpose.
In one sentence
Monitoring watches the basics (uptime, disk, memory, error rate, certificate expiry) so problems surface as clear alerts before users notice — and every alert should come with a known next step, or it’s just noise.
Want to go deeper?
Switch to Expert mode above for setting up specific checks and reviewing monitoring after an incident.