What does “alive”
really mean?

This first editorial draft is for review. It does not imply that every capability described below is deployed in my environment.

Start with the question

“Can I reach this site?”, “Is the application working?”, and “Has this device reported recently?” are different questions. A useful dashboard keeps their answers separate.

1. Reachability

An HTTP request tells you whether an endpoint responds. HEAD requests ask for response headers without the normal response body. Define which responses your monitor accepts and whether redirects count. A login-protected service can be reachable even when it returns an authentication response.

Reachable does not prove that a database query, background job, or important user workflow succeeded.

2. Application health

A health check tests a deliberately chosen part of the application. It might confirm that a required dependency responds or that a worker recently completed a task. Keep the result intentional; detailed exceptions, credentials, and internal connection details do not belong in public responses.

3. Heartbeats

A heartbeat lets a device or process report to a receiver. The receiver records when it last heard from that source. Define the reporting interval, acceptable lateness, and how to distinguish overdue from never seen. Intermittently powered workshop equipment needs its own meaning for expected downtime.

The receiver needs authentication, input validation, protected storage, and an explicit policy for failed or missing reports. Naming an endpoint does not complete that system.

A small planning checklist

• What does this check actually prove?
• Which responses or signals count as success?
• How old can a result be before it needs attention?
• What happens when the monitor is unavailable?
• Which information can be public, and which stays private?

Try it safely

Use an isolated test endpoint or device. Verify success, a failed check, a late report, and a source that has never reported. Confirm the dashboard shows the difference before depending on it.

No commands, package installation, or wiring are required for this conceptual guide. Future MCU/API articles will document a tested implementation and its actual prerequisites.