[exporterhelper] log storage errors with higher severity #7477
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Description:
The persistent queue tries to persist its state to storage whenever it changes. If it fails, it simply continues, which may not be the right decision in some cases. Either way, these kinds of errors signify a major problem with the underlying storage medium - typically it's either full, or the underlying hardware is faulty.
I'd like to rework how this error handling works in general, but in this change I just want to make the errors more visible to help with post-factum debugging.
See #7396 for more context as well.
Link to tracking Issue: Related to #7198