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437362a7a7
Resolves: #15559 As accurately noted in the issue description, the map is shared among child loggers that get created when `WithAttr()`/`WithGroup()` are called on the underlying handler, which happens via `log.With()` and `log.WithGroup()` respectively. The RW mutex was a value in the previous implementation that used go-kit/log, and I should've updated it to use a pointer when I converted the deduper. Also adds a test. Signed-off-by: TJ Hoplock <t.hoplock@gmail.com>