Black-box liveness probes
Prove a target is actually up — not just that a port answered.
- Reachability, HTTP status code, and TLS certificate expiry, on a schedule
- Raw transport connect on any port — an HL7/MLLP interface, a database, a DICOM listener
- A real DICOM C-ECHO: proves the peer accepts a DICOM association and answers Success — something a bare port-open check can never tell you
- Every result is a numeric metric, timestamped and charset-validated