Fix #11646: Non-thread safe shared buffer returned from GetLogPrefix(). #11648
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Motivation / Problem
GetLogPrefix reuses a static std::string, and returns its buffer after updating it. This is not thread safe.
This is probably a left-over from using C-style strings.
Description
Return string from GetLogPrefix instead of shared string's buffer.
Limitations
Checklist for review
Some things are not automated, and forgotten often. This list is a reminder for the reviewers.