Parameters is the official name, Arguments is just an alias

https://www.sphinx-doc.org/en/master/usage/extensions/napoleon.html

.github/CONTRIBUTING.md

@@ -128,7 +128,7 @@ But it's way more comfortable to run it locally and catch avoidable errors befor
       """
       Do something.
 
-      Arguments:
+      Parameters:
 
         x: A very important parameter.
 

src/structlog/_base.py

@@ -123,7 +123,7 @@ def _process_event(
         Call it to combine your *event* and *context* into an event_dict and
         process using the processor chain.
 
-        Arguments:
+        Parameters:
 
             method_name:
                 The name of the logger method.  Is passed into the processors.
@@ -197,7 +197,7 @@ def _proxy_to_logger(
         handling :exc:`structlog.DropEvent`, and finally calls *method_name* on
         :attr:`_logger` with the result.
 
-        Arguments:
+        Parameters:
 
             method_name:
                 The name of the method that's going to get called.  Technically
@@ -232,7 +232,7 @@ def get_context(bound_logger: BindableLogger) -> Context:
     The type of *bound_logger* and the type returned depend on your
     configuration.
 
-    Arguments:
+    Parameters:
 
         bound_logger: The bound logger whose context you want.
 

src/structlog/_config.py

@@ -114,7 +114,7 @@ def get_logger(*args: Any, **initial_values: Any) -> Any:
     >>> log.info("hello", x=42)
     y=23 x=42 event='hello'
 
-    Arguments:
+    Parameters:
 
         args:
             *Optional* positional arguments that are passed unmodified to the
@@ -169,7 +169,7 @@ def wrap_logger(
     In other words: selective overwriting of the defaults while keeping some
     *is* possible.
 
-    Arguments:
+    Parameters:
 
         initial_values: Values that are used to pre-populate your contexts.
 
@@ -217,7 +217,7 @@ def configure(
 
     Use `reset_defaults` to undo your changes.
 
-    Arguments:
+    Parameters:
 
         processors: The processor chain. See :doc:`processors` for details.
 

src/structlog/_frames.py

@@ -41,7 +41,7 @@ def _find_first_app_frame_and_name(
     """
     Remove all intra-structlog calls and return the relevant app frame.
 
-    Arguments:
+    Parameters:
 
         additional_ignores:
             Additional names with which the first frame must not start.

src/structlog/_log_levels.py

@@ -139,7 +139,7 @@ def make_filtering_bound_logger(min_level: int) -> type[FilteringBoundLogger]:
     - You *can* have (much) more fine-grained filtering by :ref:`writing a
       simple processor <finer-filtering>`.
 
-    Arguments:
+    Parameters:
 
         min_level:
             The log level as an integer. You can use the constants from

src/structlog/_output.py

@@ -36,7 +36,7 @@ class PrintLogger:
     """
     Print events into a file.
 
-    Arguments:
+    Parameters:
 
         file: File to print to. (default: `sys.stdout`)
 
@@ -122,7 +122,7 @@ class PrintLoggerFactory:
 
     To be used with `structlog.configure`\ 's ``logger_factory``.
 
-    Arguments:
+    Parameters:
 
         file: File to print to. (default: `sys.stdout`)
 
@@ -142,7 +142,7 @@ class WriteLogger:
     """
     Write events into a file.
 
-    Arguments:
+    Parameters:
 
         file: File to print to. (default: `sys.stdout`)
 
@@ -232,7 +232,7 @@ class WriteLoggerFactory:
 
     To be used with `structlog.configure`\ 's ``logger_factory``.
 
-    Arguments:
+    Parameters:
 
         file: File to print to. (default: `sys.stdout`)
 
@@ -252,7 +252,7 @@ class BytesLogger:
     r"""
     Writes bytes into a file.
 
-    Arguments:
+    Parameters:
         file: File to print to. (default: `sys.stdout`\ ``.buffer``)
 
     Useful if you follow `current logging best practices
@@ -336,7 +336,7 @@ class BytesLoggerFactory:
 
     To be used with `structlog.configure`\ 's ``logger_factory``.
 
-    Arguments:
+    Parameters:
 
         file: File to print to. (default: `sys.stdout`\ ``.buffer``)
 

src/structlog/_utils.py

@@ -20,7 +20,7 @@ def until_not_interrupted(f: Callable[..., Any], *args: Any, **kw: Any) -> Any:
     """
     Retry until *f* succeeds or an exception that isn't caused by EINTR occurs.
 
-    Arguments:
+    Parameters:
 
         f: A callable like a function.
 

src/structlog/dev.py

@@ -275,7 +275,7 @@ class ConsoleRenderer:
     *after* the log line. If Rich_ or better-exceptions_ are present, in colors
     and with extra context.
 
-    Arguments:
+    Parameters:
 
         pad_event: Pad the event to this many characters.
 
@@ -527,7 +527,7 @@ def get_default_level_styles(colors: bool = True) -> Any:
             my_styles["EVERYTHING_IS_ON_FIRE"] = my_styles["critical"] renderer
             = ConsoleRenderer(level_styles=my_styles)
 
-        Arguments:
+        Parameters:
 
             colors:
                 Whether to use colorful styles. This must match the *colors*

src/structlog/processors.py

@@ -63,7 +63,7 @@ class KeyValueRenderer:
     """
     Render ``event_dict`` as a list of ``Key=repr(Value)`` pairs.
 
-    Arguments:
+    Parameters:
 
         sort_keys: Whether to sort keys when formatting.
 
@@ -119,7 +119,7 @@ class LogfmtRenderer:
 
     .. _logfmt: https://brandur.org/logfmt
 
-    Arguments:
+    Parameters:
 
         sort_keys: Whether to sort keys when formatting.
 
@@ -237,7 +237,7 @@ class UnicodeEncoder:
     """
     Encode unicode values in ``event_dict``.
 
-    Arguments:
+    Parameters:
 
         encoding: Encoding to encode to (default: ``"utf-8"``).
 
@@ -272,7 +272,7 @@ class UnicodeDecoder:
     """
     Decode byte string values in ``event_dict``.
 
-    Arguments:
+    Parameters:
 
         encoding: Encoding to decode from (default: ``"utf-8"``).
 
@@ -308,7 +308,7 @@ class JSONRenderer:
     """
     Render the ``event_dict`` using ``serializer(event_dict, **dumps_kw)``.
 
-    Arguments:
+    Parameters:
 
         dumps_kw:
             Are passed unmodified to *serializer*.  If *default* is passed, it
@@ -385,7 +385,7 @@ class ExceptionRenderer:
     If there is no ``exc_info`` key, the *event_dict* is not touched. This
     behavior is analog to the one of the stdlib's logging.
 
-    Arguments:
+    Parameters:
 
         exception_formatter:
             A callable that is used to format the exception from the
@@ -459,7 +459,7 @@ class TimeStamper:
     """
     Add a timestamp to ``event_dict``.
 
-    Arguments:
+    Parameters:
 
         fmt:
             strftime format string, or ``"iso"`` for `ISO 8601
@@ -608,7 +608,7 @@ class ExceptionPrettyPrinter:
     """
     Pretty print exceptions and remove them from the ``event_dict``.
 
-    Arguments:
+    Parameters:
 
         file: Target file for output (default: ``sys.stdout``).
 
@@ -661,7 +661,7 @@ class StackInfoRenderer:
     involving an exception and works analogously to the *stack_info* argument
     of the Python standard library logging.
 
-    Arguments:
+    Parameters:
 
         additional_ignores:
             By default, stack frames coming from *structlog* are ignored. With
@@ -745,7 +745,7 @@ class CallsiteParameterAdder:
     The keys used for callsite parameters in the event dictionary are the
     string values of `CallsiteParameter` enum members.
 
-    Arguments:
+    Parameters:
 
         parameters:
             A collection of `CallsiteParameter` values that should be added to
@@ -880,7 +880,7 @@ class EventRenamer:
        some processors may rely on the presence and meaning of the ``event``
        key.
 
-    Arguments:
+    Parameters:
 
         to: Rename ``event_dict["event"]`` to ``event_dict[to]``
 

src/structlog/stdlib.py

@@ -63,7 +63,7 @@ def recreate_defaults(*, log_level: int | None = logging.NOTSET) -> None:
     As with vanilla defaults, the backwards-compatibility guarantees don't
     apply to the settings applied here.
 
-    Arguments:
+    Parameters:
 
         log_level:
             If `None`, don't configure standard library logging **at all**.
@@ -655,7 +655,7 @@ class LoggerFactory:
     >>> from structlog.stdlib import LoggerFactory
     >>> configure(logger_factory=LoggerFactory())
 
-    Arguments:
+    Parameters:
 
         ignore_frame_names:
             When guessing the name of a logger, skip frames whose names *start*
@@ -814,7 +814,7 @@ class ExtraAdder:
     This processor can be used for adding data passed in the ``extra``
     parameter of the `logging` module's log methods to the event dictionary.
 
-    Arguments:
+    Parameters:
 
         allow:
             An optional collection of attributes that, if present in
@@ -906,7 +906,7 @@ class ProcessorFormatter(logging.Formatter):
 
     Please refer to :ref:`processor-formatter` for examples.
 
-    Arguments:
+    Parameters:
 
         foreign_pre_chain:
             If not `None`, it is used as a processor chain that is applied to

src/structlog/testing.py

@@ -139,7 +139,7 @@ class CapturedCall(NamedTuple):
 
     Can also be unpacked like a tuple.
 
-    Arguments:
+    Parameters:
 
         method_name: The method name that got called.
 

src/structlog/threadlocal.py

@@ -83,7 +83,7 @@ def wrap_dict(dict_class: type[Context]) -> type[Context]:
 
     The wrapped class and used to keep global in the current thread.
 
-    Arguments:
+    Parameters:
 
         dict_class: Class used for keeping context.
 
@@ -106,7 +106,7 @@ def as_immutable(logger: TLLogger) -> TLLogger:
     """
     Extract the context from a thread local logger into an immutable logger.
 
-    Arguments:
+    Parameters:
 
         logger (structlog.typing.BindableLogger):
             A logger with *possibly* thread local state.

src/structlog/tracebacks.py

@@ -127,7 +127,7 @@ def extract(
     """
     Extract traceback information.
 
-    Arguments:
+    Parameters:
 
         exc_type: Exception type.
 
@@ -220,7 +220,7 @@ class ExceptionDictTransformer:
     These dictionaries are based on :class:`Stack` instances generated by
     :func:`extract()` and can be dumped to JSON.
 
-    Arguments:
+    Parameters:
 
         show_locals:
             Whether or not to include the values of a stack frame's local

src/structlog/twisted.py

@@ -204,7 +204,7 @@ class PlainFileLogObserver:
     Great to just print JSON to stdout where you catch it with something like
     runit.
 
-    Arguments:
+    Parameters:
 
         file: File to print to.
 
@@ -229,7 +229,7 @@ class JSONLogObserverWrapper:
     """
     Wrap a log *observer* and render non-`JSONRenderer` entries to JSON.
 
-    Arguments:
+    Parameters:
 
         observer (ILogObserver):
             Twisted log observer to wrap.  For example
@@ -293,7 +293,7 @@ class EventAdapter:
     <https://docs.twisted.org/en/stable/api/twisted.python.log.html#err>`_
     behave as expected.
 
-    Arguments:
+    Parameters:
 
         dictRenderer:
             Renderer that is used for the actual log message. Please note that

src/structlog/typing.py

@@ -106,7 +106,7 @@ class ExceptionTransformer(Protocol):
     Used by `structlog.processors.format_exc_info()` and
     `structlog.processors.ExceptionPrettyPrinter`.
 
-    Arguments:
+    Parameters:
 
         exc_info: Is the exception tuple to format