Website Monitoring for SaaS Companies

Your SLA Is a Promise You Have to Keep

SaaS companies live and die by availability. You put a number in your terms of service, 99.9% uptime, 99.95%, whatever the commitment is, and your customers hold you to it. Enterprise customers build their own architectures on top of your reliability. When you go down, they go down, and they remember it.

99.9% uptime sounds generous until you do the math. That is 8.76 hours of allowed downtime per year, or about 43 minutes per month. One bad deployment, one expired certificate, one DNS misconfiguration, and you have burned through your entire monthly error budget in a single incident.

The problem is that most SaaS teams only monitor the obvious failure mode: is the application server responding? But a SaaS product is not a single server. It is a web of services, certificates, domains, subdomains, DNS records, and third-party dependencies. Any one of them can fail independently, and many of them fail silently.

The SaaS Attack Surface

A typical SaaS product has more monitoring targets than most teams realize:

• Primary marketing site (yourproduct.com)
• Application (app.yourproduct.com)
• API endpoints (api.yourproduct.com)
• Documentation (docs.yourproduct.com)
• Status page (status.yourproduct.com)
• Webhook receivers (webhooks.yourproduct.com)
• Multiple SSL certificates across all subdomains
• DNS records for each subdomain plus MX, SPF, DKIM, and DMARC for email
• Third-party services like AWS, Stripe, Auth0, SendGrid, Twilio, and Datadog

Each of these is a potential point of failure. Your application can be running perfectly while your marketing site is down, or your API certificate has expired, or Auth0 is having an incident that prevents your users from logging in.

Traditional APM tools like Datadog or New Relic are excellent at monitoring application performance. They track request latency, error rates, database query times, and memory usage. But they do not check whether your SSL certificates are about to expire, whether your domain registration is current, or whether your DNS records have changed. They do not monitor third-party vendor status pages.

You need both. APM for application-level performance, and infrastructure monitoring for everything else.

What SaaS Companies Need to Monitor

SLA Compliance Is Not Optional

For B2B SaaS companies, SLA violations have direct financial consequences:

The tighter your SLA commitment, the less room you have for undetected issues. An SSL certificate that expires at 2 AM and is not noticed until 8 AM has consumed your entire monthly error budget at the 99.9% level. A DNS misconfiguration that goes undetected for a day violates even a 99.0% SLA.

Continuous monitoring is not a nice-to-have for SaaS. It is a contractual obligation.

How SaaS Teams Use Site Watcher

Complement Your Existing Stack

Site Watcher does not replace your APM. It fills the gaps your APM does not cover. Think of it as the outer perimeter while your APM watches the inner workings.

Your APM tells you that API response times are elevated. Site Watcher tells you that the SSL certificate on api.yourproduct.com expires in 12 days, that your marketing site's DNS A record changed unexpectedly, and that Auth0 is reporting degraded performance.

These are different categories of information, and you need both.

Post-Deployment Verification

After a deployment, your CI/CD pipeline runs tests and verifies that the application starts. But it does not check whether the deployment accidentally broke SSL termination, modified DNS records, or introduced a routing error on a specific subdomain.

Adding a post-deployment monitoring check to your workflow catches issues that integration tests miss. If your deployment changes infrastructure, not just code, this layer of verification is essential.

Vendor Incident Response

When a critical vendor like AWS or Stripe has an incident, your support team needs to know immediately. Not because they can fix Stripe, but because they can:

• Update your status page with accurate information
• Proactively communicate with affected customers
• Prepare for the support ticket volume
• Document the incident for SLA calculations

Site Watcher's vendor monitoring gives your team advance warning. When Stripe reports degraded API performance, your team is already drafting the customer communication instead of scrambling after the first support ticket arrives.

Multi-Subdomain SSL Management

Managing SSL certificates across multiple subdomains is one of the most common sources of SaaS outages. Here is how it goes wrong:

Site Watcher prevents this by monitoring SSL certificates on every target you add. When you launch a new subdomain, add it to Site Watcher. The certificate is now tracked automatically alongside all your other certificates.

Pricing for SaaS Needs

SaaS products have a lot of monitoring targets. A product with a marketing site, application, API, docs, status page, and webhook endpoint has six targets before you count staging environments, regional endpoints, or additional domains.

Per-target pricing punishes complexity. If each target costs $2-5/month, a comprehensive monitoring setup for a SaaS product runs $50-150/month easily.

Site Watcher is $39/month flat, unlimited targets. Add every production subdomain. Add staging and development environments. Add your defensive domain registrations. Add your partner and integration endpoints. The price stays the same.

For teams evaluating the tool, the free tier lets you monitor 3 targets with all five check types. Start with your most critical endpoints and expand once you see the value.

Building a Monitoring Culture

The best SaaS teams do not treat monitoring as a chore. They treat it as a core practice:

Every new subdomain gets a monitoring target. Make it part of the launch checklist. No subdomain goes live without uptime, SSL, and DNS monitoring configured.

Vendor dependencies are documented and monitored. Maintain a list of every third-party service your product depends on. For each one, configure vendor monitoring so your team knows about incidents as they happen.

SLA reporting is automated. Use uptime monitoring data to calculate and report SLA compliance to customers. This turns monitoring from a cost center into a trust-building exercise.

Post-incident reviews include monitoring gaps. When an incident happens, ask: did our monitoring catch this? How quickly? If it did not, what monitoring should we add to catch similar issues in the future?

Alert routing is thoughtful. Not every alert needs to wake someone up at 3 AM. Route critical production alerts to on-call engineers via SMS. Route upcoming certificate expirations to email. Route vendor incidents to a shared Slack channel. Match the urgency of the alert to the urgency of the channel.

Your APM Watches the Inside. Site Watcher Watches Everything Else.

Application performance monitoring tells you how your code is running. Site Watcher tells you whether your infrastructure is healthy, your certificates are valid, your domains are secure, your DNS is intact, and your vendors are operational.

Together, they give you complete visibility into your product's availability. Separately, each one leaves gaps that turn into incidents, support tickets, and SLA violations.

Your customers chose your product because they trust you to be reliable. Comprehensive monitoring is how you keep that trust.