Loggers should be 'private static final'

[qmonmert]

Same as #26531 without renaming

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[mshima]

Does this PR fixes the issue?

[qmonmert]

@mshima which issue?

[mshima]

#26531 (comment), log needs to be upper case to be fixed?

[mshima]

Not merging since I am considering we are in code freeze due to the release.

[qmonmert]

@mshima this PR is a simplified PR of #26531 because we must decide if we rename log into LOGGER

[mshima]

@mshima this PR is a simplified PR of #26531 because we must decide if we rename log into LOGGER

So the issue still exists with lower case log. Am I correct?

LOG should be accepted too.