Concepts
Understand the building blocks — monitors, heartbeats, incidents, on-call schedules, and escalation policies.
What's in this section
Concept pages explain why the platform behaves the way it does, without prescribing a workflow. Read these once and you will have a stable mental model for the rest of the docs.
- Monitors — HTTP, ping, port, and screenshot probes. Frequencies and tier limits.
- Heartbeats — passive checks (cron jobs, workers) that ping us.
- Incidents & severities — how multiple failing checks resolve into one incident.
- On-call & escalations — schedules, rotations, overrides, and escalation policies.
For how to actually do things, see the How-to section. For symptom-first debugging, see Troubleshooting.
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