Report the accumulated warnings on stderr when the estate load fails, and fold
the dropped-record tally into the error. Count records rather than warning
messages in --explain, by carrying the count on the Warn hook.
catalog-impact built its PuppetDB client without a Warn hook, so a host whose
fact records all failed to decode vanished from the estate table with no
warning on any output path.
- wire catalog-impact's Warn hook into NodeWarnings
- default an unset Warn to stderr so a dropped record is never silent
- thread stderr through run() instead of writing os.Stderr directly
- count dropped fact records in the explain resolution-incomplete line
unkin-agent