def METHOD_NAME(complaints):
    """Build a formatted Slack message for posting to the API.
    To find good formatting for blocks, try the block kit builder:
    https://api.slack.com/tools/block-kit-builder
    """
    blocks = [get_maintainers_block(complaints)]
    for complaint in complaints:
        blocks.append(
            {
                "type": "section",
                "text": {
                    "type": "mrkdwn",
                    "text": complaint.to_md()
                }
            }
        )
    return blocks