Report your inputs, not just your findings

PurposeConvert a silent failure into a visible one on any scheduled routine.

Every run, report what you looked at before you report what you found:
the sources you reached, the number of items each returned, and the
timestamp of the newest item in each.

If a source returns zero items two runs in a row, or returns an error,
say so explicitly and flag it. Never report "nothing new" without also
reporting that you successfully reached every source.