Quick answer: Website uptime monitoring is an external service that requests your pages on a schedule and alerts you when responses fail or slow down. Pick a tool that checks over HTTPS from multiple regions, alerts via email/SMS/phone/Slack, and records history for postmortems. Monitor the homepage plus critical paths (login, checkout, API health). Pair alerts with a simple response runbook and, for customer-facing products, a status page. Monitoring does not prevent downtime; it shortens the time you spend unaware.
Why “we would notice” is not a strategy
Teams find out about outages from Twitter, clients or the boss. That lag turns a five-minute blip into an hour of lost sales and trust. External monitoring watches from outside your office network, so it catches failures your internal dashboard misses (DNS, certificate expiry, regional routing, full disk on the host).
Uptime work sits next to disaster recovery and DDoS protection planning. Different layers, same goal: keep the business reachable.
What to monitor
Minimum useful set:
- Homepage over HTTPS
- A key landing page
- Login or account page if relevant
- Checkout or contact form endpoint
- API health route for products that depend on APIs
- SSL certificate expiry checks
Advanced setups add keyword checks (page must contain a string that proves the app rendered, not only a reverse proxy 200) and multistep transactions. Start simple; false complexity creates alert fatigue.
Check frequency and locations
- 1-minute checks for revenue-critical storefronts
- 5-minute checks for brochure sites
- Multiple regions to avoid treating one probe network blip as your outage
Agree what “down” means: non-200 status, timeout, missing keyword, or total response time above a threshold. Document it.
Alert routing that people honor
Alerts fail when everyone gets everything.
- Primary: on-call SMS or phone for hard down
- Secondary: Slack for degraded performance
- Esc salation: if not acknowledged in 15 minutes, page a backup person
- Quiet hours with care: customers still shop at night
Rotate on-call if you are a team. For a solo founder, at least send SMS to a phone that is not on mute forever.
False positives and flapping
Causes:
- Brief network hiccups on the checker side
- Aggressive timeouts
- Blocking monitoring user agents in WAF rules
- Maintenance windows without pauses
Mitigations: require two failed checks before paging, allowlist monitor IPs on the WAF, schedule maintenance mode in the monitor, and tune timeouts to your stack’s cold-start reality.
Status pages and communication
For SaaS and larger ecommerce, a status page (separate infrastructure) keeps you communicating when the main site is down. Templates for “investigating / identified / resolved” save time. Link status URLs from footer and support macros.
Even small businesses can use a simple hosted status page or a pre-agreed social post plan.
Response runbook (keep it short)
- Confirm from a second network (phone LTE vs office Wi-Fi)
- Check host/status dashboards and SSL expiry
- Check DNS and domain registrar lock/status
- Check recent deploys; roll back if correlated
- Enable maintenance page if partial failure confuses users
- Update stakeholders every 15 to 30 minutes
- After recovery, write a short postmortem: trigger, impact, fix, follow-up
Practice once. An unread runbook helps nobody at 2 a.m.
Metrics worth reviewing monthly
- Uptime percentage (know the denominator and exclusions)
- Mean time to acknowledge
- Mean time to recover
- Top failure causes (host, plugin, DNS, upstream API)
- Alerts that were noise (prune them)
Ninety-nine percent uptime is about three days down per year. Whether that is acceptable depends on the business, not a vendor badge.
Hosting and application habits that help
Monitoring without basics is incomplete:
- Reliable host and disk alerts from the server side
- Staging before production deploys
- Limits on risky plugins
- PHP and platform versions you still support
- Backups you have restored successfully
When the site is WordPress, keep an eye on plugin/theme update windows and use Site Health cues (Site Health) alongside external monitors.
Tooling categories (2019)
You will find free tiers for basic ping checks, paid tiers for SMS and multi-step checks, and enterprise suites tied to full observability. Choose based on alert channels, regions, logging retention and whether you need transaction checks. Switching tools later is possible if you keep a documented list of URLs and thresholds.
Multi-step checks for checkout
If revenue depends on cart and checkout, add a monitored checkout path:
- Load category page
- Add to cart (against a staging product or safe SKU)
- Reach checkout page
Run these less often than simple pings to avoid polluting analytics or inventory, or point them at staging with production-like config. The goal is to catch application failures that a homepage 200 hides.
DNS and certificate specifics
Separate monitors for DNS resolution and certificate expiry catch problems before HTML checks fail. Certificate alerts should fire at 14 days and 7 days, not only on expiry day. Domain registrar account security belongs in the same conversation as domain security.
Budget reality for small teams
A basic monitor with email alerts can be free or cheap. SMS and phone calls cost more and are worth it when after-hours downtime is expensive. Calculate roughly: if one hour of silent outage costs more than a year of SMS alerts, pay for the alerts. Then actually answer them.
Quarterly drill
Once a quarter, intentionally pause a staging site (or a dedicated health URL) and confirm the alert path fires to the right people. Fix stale phone numbers and departed staff in the escalation list. Monitoring rots the same way documentation does when nobody touches it.
Keep the drill notes next to the runbook so the next on-call person inherits a living process, not a forgotten PDF.
FAQ
Is a server ping enough?
No. ICMP can succeed while HTTPS or the application fails. Prefer HTTP(S) checks.
Should we monitor from only one city?
Better than nothing; two or more regions reduce false calm when a single probe fails or a single region routes badly.
Do CDNs change monitoring?
Monitor the public URL users hit. Optionally also monitor origin carefully so you can tell CDN vs origin problems apart.
What about planned maintenance?
Pause or mark maintenance in the monitor and post a notice. Otherwise you train people to ignore alerts.
Hear about downtime before your customers do
Website uptime monitoring is an early-warning system: external checks, sane alerts, a short runbook and honest communication. Set it up on the URLs that make money, tune out noise and review history monthly. If you want help hardening hosting, monitoring and recovery for a business site, see Turn visitors into customers.
