Integration Monitoring for Startups
You do not need to monitor everything. You need to monitor the three things that lose money, and you can decide which in an afternoon.
Startups do not have a monitoring problem. They have a prioritisation problem that looks like a monitoring problem, and the usual advice to instrument everything makes it worse by producing a system nobody maintains.
Rank by cost of failure, not by importance
Write down every integration, then answer two questions for each: what does an hour of silent failure cost, and how would you currently find out. Anything expensive that you would learn about from a customer goes to the top.
| Integration | Cost of an hour down | How you find out today |
|---|---|---|
| Payment webhooks | Direct revenue | Customer email |
| Signup provisioning | Lost conversions | Support ticket |
| Nightly data sync | Stale dashboards | Someone notices a number |
| Marketing automation | Delayed emails | Nobody, for days |
| Internal Slack alerts | Mild annoyance | Immediately |
Most startups find the list has three rows that matter and seven that do not. Monitor the three properly and set a weekly calendar reminder to spot-check the rest. That is a defensible position, not a compromise.
Everything runs on one person's credentials
This is the specific startup risk and it is worth an hour of your time before anything else. Integrations connected during the first six months are typically authorised under whichever founder or first engineer was at the keyboard.
When that person changes their password, enables new security settings, or leaves, the integrations die. There is no warning and the cause is not obvious from the error.
Move anything load-bearing onto a shared service account now, while you have five integrations rather than fifty. It is an afternoon today and a fortnight later.
Buy the boring parts
Building monitoring is appealing because it is a small, well-understood problem. It is also a problem with no competitive advantage and a long tail of maintenance: alert delivery, deduplication, escalation, timezone handling, and a status page for when your monitoring itself is down.
A cron job posting to Slack is a reasonable first version and it fails in exactly the way you need it not to, because when the server is down the cron job is down and the Slack message never arrives. That is not a hypothetical edge case; it is the main case.
Pick thresholds you will not mute
The failure mode for startup monitoring is not missing an alert. It is creating an alert that fires falsely twice a week until the channel is muted, at which point you have worse coverage than before you started.
Set the first threshold deliberately loose. A monitor that catches a six-hour outage and never cries wolf is worth more than one that catches a twenty-minute outage and gets ignored by week three.
That third line costs nothing to set up and covers two of the most common ways a small company takes itself offline.
Write down what breaks what
The most valuable artefact at this stage is not a dashboard. It is a one-page list of your integrations, what each one does, whose account it runs under, and what stops working when it fails.
It takes an hour, it makes onboarding your next engineer dramatically faster, and it is the document you will want at 2am when something you have not thought about in months stops working.
SensaCat's free tier covers a couple of monitors, a couple of credentials and a domain, which is enough for the shortlist above. Start free.