Most uptime checks answer a narrow question: did the homepage return a successful response?
That is useful, but it is not the same as knowing whether your product works.
For a small SaaS, the more important question is:
Can a new user discover the product, sign up, and reach the first useful screen right now?
A homepage can be green while signup is broken. Login can fail while the marketing site looks perfect. A background job can stop sending onboarding emails while every public page still returns 200.
That is why I like thinking in critical paths instead of “monitor everything.”
The short version
| Critical path | What can break while the homepage is up | First monitor to add |
|---|---|---|
| Discovery | Landing page is slow or unavailable | Homepage uptime + response time |
| Signup | Auth/API errors block new users | Signup page or auth endpoint check |
| Activation | Dashboard or first action fails | One key app/API path |
| Trust | SSL/domain problems scare visitors | SSL and domain expiry checks |
| Follow-through | Background jobs fail silently | Heartbeat after successful completion |
You do not need a giant monitoring setup on day one. You need a few checks that protect the moments where trust is easiest to lose.
Why homepage uptime is not enough
Homepage monitoring is the right first step. If the front door is down, nothing else matters.
But homepage uptime can give a false sense of safety.
Here are common failures that a homepage check may miss:
- signup form loads but submission returns an error;
- login redirects fail because an auth provider callback changed;
- pricing page works but checkout fails;
- app dashboard loads but a required API endpoint times out;
- onboarding emails stop because a scheduled job failed;
- SSL is valid on the main domain but not on the app/API subdomain;
- response time jumps from 400 ms to 12 seconds after a deploy.
Users experience those as product failures, even if your homepage monitor stays green.
Start with the user journey
For an early SaaS, I would map monitoring to the first user journey:
- Can someone reach the homepage?
- Can they open the signup or login page?
- Can they complete one action that proves the backend works?
- Are the certificate and domain safe?
- Do important background jobs report success?
This keeps monitoring practical. You are not trying to cover every internal system. You are trying to protect the few paths that determine whether a new user can trust the product.
A practical first setup
If I were setting this up from scratch, I would start with five checks.
1. Homepage monitor
Check the main domain for status code and response time.
This catches the obvious failure: people cannot discover what you built.
2. Signup or auth monitor
Monitor the signup page separately from the homepage.
If possible, also check a lightweight auth or API endpoint that proves the product backend is reachable.
A green homepage does not prove new users can start.
3. One critical app or API path
Choose one path that represents product value.
Examples:
- an API health endpoint;
- a dashboard route;
- a read-only endpoint that checks required dependencies;
- a public endpoint used by onboarding or activation.
Do not turn this into a full synthetic test suite yet. One high-signal path is enough to catch many trust-breaking failures.
4. SSL and domain expiry
Certificate or domain failures are preventable, but they create immediate trust damage.
Monitor the primary domain and any important subdomains: app, API, docs, or status page.
5. Heartbeat for one important background job
Some failures are quiet.
A scheduled job might stop running while the website looks healthy. Backups, email digests, billing syncs, imports, and cleanup jobs often fail this way.
For those, use a heartbeat monitor: the job pings only after it finishes successfully. If the ping does not arrive on time, you know the useful work did not complete.
The rule of thumb
Add a monitor when failure would block one of these outcomes:
- a visitor discovering the product;
- a user signing up or logging in;
- a new user reaching value;
- a customer trusting the product;
- an important job completing quietly in the background.
If a check does not protect one of those outcomes, it can probably wait.
Avoid the “monitor everything” trap
Early monitoring should reduce uncertainty, not create another inbox.
Too many monitors can create noisy alerts, duplicate incidents, and maintenance work. Too few monitors leave you blind to the most important failures.
The middle ground is critical-path monitoring.
Start with a small set of checks. Review real incidents. Add the next monitor only when you learn that a failure mode matters.
A simple checklist
For a small SaaS, start here:
- homepage uptime and response time;
- signup/login page;
- one backend or API health path;
- SSL certificate expiry;
- domain expiry;
- one heartbeat for the most important scheduled job;
- one alert channel you will actually notice;
- a short incident note template.
That setup is not enterprise observability. It is a practical safety net.
Where PingHarbor fits
This is the kind of first monitoring layer we are building PingHarbor around: simple uptime, performance, SSL/domain, and heartbeat monitoring for small teams that need to know before users silently leave.
If you want to apply this checklist, start with your homepage and signup path first: https://pingharbor.com/?utm_source=devto&utm_medium=organic&utm_campaign=signup_sprint_001&utm_content=critical_path_article_home
If you want to create a first monitor directly, the signup path is here: https://pingharbor.com/auth?tab=signup&utm_source=devto&utm_medium=organic&utm_campaign=signup_sprint_001&utm_content=critical_path_article_signup
And if you want a related deeper guide, this launch-day checklist is a good next step: https://pingharbor.com/blog/product-launch-monitoring-checklist?utm_source=devto&utm_medium=organic&utm_campaign=signup_sprint_001&utm_content=critical_path_article_related
The main idea is simple: do not wait until users are the monitoring system.
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