redpanda: hexdump config on 'unknown escape character' #8552
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On this particular exception type (but not on general config load errors), dump out a hexdump-style view of the bytes we loaded from the config yaml file.
This error occurs very occasionally, it is suspected that something is wrong with lower layers in the system, but it's hard to infer much without knowing what's in the byte buffer that we're reading.
Related: #3798
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