Show the content of the object intended for diagnostics by system administrator. The out
put should be suitable to use in system logs at "debug" level. It may be multi-line, but in
that case it should be well indented and quite terse.
As it is intended to be used by system administrator, it should not use any developer terms
such as class names, exceptions or stack traces.
Returns:
content of the object intended for diagnostics by system administrator.