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Availability monitoring

Website Availability Beyond HTTP Status Codes

Availability isn't binary. Your server can respond with 200 OK while your JavaScript is broken, your CDN is serving stale assets, and your checkout form won't render. True website availability means every page works correctly for every visitor, in every region. Sitewatch monitors all of it — not just whether the server is on.

  • Full-page validation, not just HTTP status checks
  • Multi-region checks from EU and US
  • SLA-ready incident history and reports
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What availability really means

Three layers of website availability

Layer 1: Server availability

Is the server responding? This is what traditional uptime monitors check — HTTP status codes and response times. Necessary, but not sufficient.

Layer 2: Page availability

Does the page render correctly? Are all linked assets — JS, CSS, images, fonts — loading successfully? A page can "load" while being completely broken.

Layer 3: Regional availability

Is the site available in all regions? CDN edge failures, DNS propagation delays, and regional routing issues can make your site unavailable in specific geographies.

11

Detection rules

EU + US

Check regions

5 min

Fastest interval

Common availability failures

When "available" doesn't mean "working"

Asset-level failure

Critical

Server returns 200. But the JS bundle that powers your app is missing. Every interactive element is dead. Your availability monitor says 100%.

Regional CDN outage

Critical

Your CDN edge in Europe serves stale or corrupted files. US monitoring shows 100% availability. European users see a broken site.

Partial page failure

Moderate

Homepage works perfectly. But your pricing page has a redirect loop, your docs have broken CSS, and your signup form's auth script won't load.

Slow degradation

Moderate

Response times creep from 200ms to 8 seconds. Technically "available." Practically unusable. Users bounce before the page renders.

Deep availability checks

How Sitewatch monitors true availability

01

Multi-region page fetch

Sitewatch fetches your pages from EU and US regions, checking availability from multiple geographic locations — not just one data center.

02

Full asset validation

Every linked resource is validated — JS bundles, stylesheets, images, fonts, third-party scripts. A single missing asset means the page isn't truly available.

03

Content fingerprinting

SHA-256 fingerprinting detects unexpected content changes. If a CDN serves stale content or a deploy changes page structure, you'll know immediately.

04

Root cause alerting

When availability drops, you get the specific cause — not just "site down." Broken bundle, MIME mismatch, timeout — with stack-specific fix guidance.

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Availability depth

Uptime monitoring vs availability monitoring

What it checks

Uptime monitoring:HTTP status code
Sitewatch availability:Full page + every linked asset

Regional checks

Uptime monitoring:Single location
Sitewatch availability:EU + US (Pro)

Asset validation

Uptime monitoring:No
Sitewatch availability:JS, CSS, images, fonts

Content integrity

Uptime monitoring:No
Sitewatch availability:SHA-256 fingerprinting

MIME verification

Uptime monitoring:No
Sitewatch availability:Yes

Root cause diagnosis

Uptime monitoring:No
Sitewatch availability:Automatic classification

SLA reporting

Uptime monitoring:Basic uptime %
Sitewatch availability:Incident history + evidence

Availability monitoring FAQ

Monitor true availability, not just uptime

Free plan available. No credit card required.

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