Published July 5, 2024
A monitoring setup that looks complete on paper can still miss the exact thing that takes a server down. Not because nobody set up monitoring, but because it was set up around a handful of assumptions that quietly stopped being true — a threshold nobody revisited, an alert nobody's actually watching, a certificate check nobody added. Skip a review of these server monitoring mistakes, and the gap stays invisible right up until an incident finds it for you.
This checklist covers the mistakes that show up most often in real setups, not hypothetical ones. None of them are hard to fix once you know to look for them, and most take far less effort to correct than the incident they'd otherwise cause.
Watching only the important servers. It's natural to keep a close eye on the main production box and forget the smaller ones — a worker, a staging server, a cron host — until one of them runs out of resources and takes something down with it. A monitoring setup is only as good as its coverage across the whole fleet, not just the parts that feel critical, and the servers that get forgotten are usually the ones without an obvious owner.
Trusting a ping instead of a real check. A ping only confirms a server responds to the network — it says nothing about whether the actual application running on it is working. A server can pass a ping while the service itself throws errors or serves a blank page, which means the monitoring gives a false sense of security exactly when it matters most.
Leaving thresholds on default settings. A default CPU or memory threshold either fires constantly on a busy server or stays silent on one running close to its limits. Thresholds set against how a resource actually behaves — different for a database server than for a lightly used staging box — are what make an alert worth trusting.
Skipping the alert delay. Without a short delay, a five-second network blip gets treated the same as a genuine outage, and teams learn to tune out alerts as a result — which quietly defeats the purpose of having them at all.
Sending alerts to the wrong channel. An alert sitting in an inbox nobody opens is functionally the same as no alert at all. It needs to land wherever the responsible team is actually looking, not wherever it was easiest to configure at the time, and different resources often warrant different destinations rather than one shared setup for everything.
Treating SSL expiry as part of uptime. Certificate expiry is one of the most predictable outages there is, and it still catches teams off guard because nothing else about the server changes until the exact moment it happens. It needs its own check, on its own schedule.
Never revisiting the setup. A monitoring configuration built once at launch tends to age badly. New servers get added without being included, traffic patterns shift, and thresholds tuned for last year's load stop reflecting reality — the mistakes above tend to creep back in quietly unless the setup is reviewed on purpose.
BigBell's server monitoring is built to avoid these mistakes by default rather than requiring constant manual upkeep. A lightweight agent tracks CPU, memory, and disk usage on every Linux server it's installed on, and for cloud virtual machines, BigBell pulls performance data directly from AWS CloudWatch, Azure Monitor, or Google Cloud Monitoring, depending on where each one runs, so coverage doesn't quietly depend on which server someone remembered to add.
BigBell's URL monitoring performs a real HTTP check rather than a simple ping, tracking the actual status code and response time a visitor would get. SSL certificate expiry is checked on its own independent schedule, separate from general uptime. Thresholds are set per server or application instead of one blanket default, and a configurable delay means a brief spike doesn't get treated as an outage, while a recovery notification confirms once things are healthy again. Alerts can be routed at the organization, project, or application level, reaching your team through email, Slack, Microsoft Teams, Google Chat, WhatsApp, SMS, or a phone call — whichever channel is actually being watched, rather than wherever configuration happened to default to.
Try BigBell free and check your own setup against this list.
Watching only the servers that feel important and forgetting the smaller ones. Incidents just as often start on a worker or staging box that nobody was paying attention to.
Because it only tests whether the server responds on the network, not whether the actual application or service on it is functioning correctly. A server can pass a ping while the real service is broken.
If alerts fire constantly on a server that's actually fine, or stay silent on one that's clearly struggling, the threshold doesn't match real behavior and is worth revisiting.
No. It filters out brief blips that resolve on their own, so a genuine, sustained issue still triggers an alert quickly, without the noise of constant false alarms in between.
Because certificate expiry happens on a fixed date, unrelated to traffic or server load, and a general uptime check won't catch it in advance the way a dedicated schedule can.
Whenever infrastructure changes meaningfully — a new server, a new provider, a shift in traffic — rather than only once when it's first built. A setup left untouched tends to drift out of date.
Yes, either way. Uptime tells you whether something is reachable right now; resource usage tells you why it might stop being reachable soon. Skipping either one leaves a real gap in what you'd actually catch.
No. Fixing the most damaging ones first — usually incomplete server coverage and a ping-only check — closes the biggest gaps quickly, and the rest can follow as the setup matures.
Not automatically. A tool being installed doesn't guarantee it's configured to avoid every mistake on this list — it's worth checking the configuration itself, not just whether monitoring exists at all.
Yes. That's largely why revisiting the setup regularly matters — a threshold that was correct six months ago, or an alert channel a team has since stopped using, can quietly become wrong again without anyone changing anything on purpose.
