The export succeeded, but the file is empty

What it looks like

The export finishes on schedule and writes a file, but the observed file_bytes value is 0.

Why a heartbeat is green

The exporter completed without an exception, so a run-only monitor sees a healthy process.

Expectation that catches it

Add an output expectation that warns when file_bytes is less than 1.

Report it to Glnc

Measure the final artifact after the write completes, then send that byte count with the successful run receipt.

POST /api/v1/monitoring/checks/nightly-export/runs

{
  "result": "succeeded",
  "report_id": "nightly-export-20260830T020000Z",
  "evidence": {
    "file_bytes": 0
  }
}