In the mean time I have implemented an autofix like feature for G004 with ast-grep transformation rules https://ast-grep.github.io/reference/yaml/rewriter.html#transform, you may find it useful, it is not prefect but it works for my use case.

id: no-fstring-in-logging
language: python
rule:
  any:
    - pattern: $LOGGER.$METHOD($IDENTS)
    - pattern: $LOGGER.$METHOD($IDENTS, $$$KWARGS)
constraints:
  METHOD:
    regex: ^(trace|debug|info|warning|warn|error|log)$
  LOGGER:
    any:
      - kind: identifier
      - kind: attribute
  IDENTS:
    regex: 'f"[^"]*"'
rewriters:
- id: rewrite-identifier
  rule:
    pattern: $VAR
    any:
      - kind: identifier
      - kind: attribute
  fix: $VAR
transform:
  ARGS:
    rewrite:
      rewriters: [rewrite-identifier]
      source: $IDENTS
      joinBy: ", "
  MESSAGE:
    replace:
      source: $IDENTS
      replace: 'f"([^"]*)"'
      by: '"$1"'
  FINAL_MESSAGE:
    replace:
      source: $MESSAGE
      replace: '\{[^}]+\}'
      by: '%s'
fix: $LOGGER.$METHOD($FINAL_MESSAGE, $ARGS, $$$KWARGS)

just run the following command, assuming you have stored the rule above in /path/to/rules.yml

$AST_GREP_COMMAND scan --interactive --rule /path/to/rules.yml

Autofix for flake8-logging-format (G) rules #15555

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