A sample implementation of sentry user context with discord.py. A better solution would be to override the on_error function which I realised after writing this beast..

sentry_decorator.py

"""Decorators, primarily related to sentry logging."""
import functools

import sentry_sdk

import discord
from discord.ext import commands


def sentry_user_context(payload_position: int, payload_type: object, bot: commands.Bot = None):
    """Provide user context for sentry logging."""
    def decorator(function):
        @functools.wraps(function)
        async def wrapper(*args, **kwargs):
            user_object: discord.User = None
            user = {}
            payload = args[payload_position]
            if payload_type == commands.Context:
                user_object = payload.message.author

            elif payload_type == discord.RawReactionActionEvent:
                if bot is None:
                    raise ValueError('RawReactionActionEvent payload requires bot object')
                user_object = bot.get_user(payload.user_id)

            else:
                raise ValueError('Unsupported payload type.')

            with sentry_sdk.configure_scope() as scope:
                scope.user = {
                    'id': user_object.id,
                    'username': f'{user_object.name}#{user_object.discriminator}'
                }
                return await function(*args, **kwargs)
        return wrapper
    return decorator