WordPress plugin that logs when a options are modified. Create folder `/plugins/simple-history-options-logger` and add file inside folder. Then active plugin in WordPress admin.

simple-history-options-logger.php

<?php
/**
 * Plugin Name: Simple History Options Logger
 * Description: Logs changes to selected WordPress options in Simple History
 * Version: 1.0.0
 * Author: Simple History
 * Text Domain: simple-history-options-logger
 * Domain Path: /languages
 * Requires at least: 5.0
 * Requires PHP: 7.4
 *
 * @package SimpleHistoryOptionsLogger
 */

namespace SimpleHistoryOptionsLogger;

// Exit if accessed directly.
if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

// Initialize the plugin.
add_action( 'plugins_loaded', [ '\SimpleHistoryOptionsLogger\Simple_History_Options_Logger', 'get_instance' ] );

/**
 * Main plugin class
 */
class Simple_History_Options_Logger {
	
	/**
	 * Plugin instance
	 *
	 * @var Simple_History_Options_Logger|null
	 */
	private static $instance = null;
	
	/**
	 * List of option names to log when updated.
	 * Edit this array to monitor more options.
	 * 
	 * @var array
	 */
	protected $options_to_log = [
		'blogname',
		'blogdescription',
		'admin_email',
	];
	
	/**
	 * Get singleton instance
	 *
	 * @return Simple_History_Options_Logger The plugin instance
	 */
	public static function get_instance() {
		if ( null === self::$instance ) {
			self::$instance = new self();
		}
		
		return self::$instance;
	}
	
	/**
	 * Constructor
	 */
	private function __construct() {
		$this->init_hooks();
	}
	
	/**
	 * Initialize hooks
	 *
	 * @return void
	 */
	private function init_hooks() {
		add_action( 'update_option', [ $this, 'log_option_update' ], 10, 3 );
		add_action( 'delete_option', [ $this, 'log_option_delete' ], 10, 1 );
		add_action( 'add_option', [ $this, 'log_option_add' ], 10, 1 );
	}
	
	/**
	 * Gets a simplified backtrace for logging purposes.
	 * 
	 * @return array Backtrace information including the backtrace summary string.
	 */
	public function get_backtrace_info() {
		// Get the full backtrace.
		$backtrace = debug_backtrace( DEBUG_BACKTRACE_IGNORE_ARGS, 5 );
		$trace = [];
		
		// Skip the first two entries which would be this function and the logger function.
		for ( $i = 2; $i < count( $backtrace ) && $i < 5; $i++ ) {
			$item = $backtrace[$i];
			$trace[] = [
				'file' => isset( $item['file'] ) ? basename( $item['file'] ) : 'unknown',
				'line' => isset( $item['line'] ) ? $item['line'] : 0,
				'function' => isset( $item['function'] ) ? $item['function'] : 'unknown',
				'class' => isset( $item['class'] ) ? $item['class'] : '',
			];
		}
		
		// Get a summary using WordPress built-in function.
		$summary = '';
		if ( function_exists( 'wp_debug_backtrace_summary' ) ) {
			$summary = wp_debug_backtrace_summary( null, 0, true );
		}
		
		return [
			'trace' => $trace,
			'summary' => $summary,
		];
	}
	
	/**
	 * Fires immediately before an option value is updated.
	 *
	 * @param string $option    Name of the option to update.
	 * @param mixed  $old_value The old option value.
	 * @param mixed  $value     The new option value.
	 * @return array|void Backtrace information if logged, void otherwise.
	 */
	public function log_option_update( $option, $old_value, $value ) {
		if ( ! in_array( $option, $this->options_to_log, true ) ) {
			return;
		}
		
		// Check if SimpleLogger exists before using it.
		if ( ! function_exists( '\SimpleLogger' ) ) {
			return;
		}
		
		// Get backtrace information.
		$backtrace_info = $this->get_backtrace_info();
		
		// Log the update.
		\SimpleLogger()->info(
			sprintf( 'Option "%s" updated from "%s" to "%s"', $option, $old_value, $value ),
			[
				'context'   => 'options',
				'option'    => $option,
				'old_value' => $old_value,
				'new_value' => $value,
				'backtrace' => $backtrace_info['trace'],
				'backtrace_summary' => $backtrace_info['summary'],
			]
		);
		
		return $backtrace_info;
	}
	
	/**
	 * Log when an option is deleted.
	 *
	 * @param string $option Name of the option to delete.
	 * @return array|void Backtrace information if logged, void otherwise.
	 */
	public function log_option_delete( $option ) {
		if ( ! in_array( $option, $this->options_to_log, true ) ) {
			return;
		}
		
		// Check if SimpleLogger exists before using it.
		if ( ! function_exists( '\SimpleLogger' ) ) {
			return;
		}
		
		// Get backtrace information.
		$backtrace_info = $this->get_backtrace_info();
		
		// Log the deletion.
		\SimpleLogger()->info(
			sprintf( 'Option "%s" deleted', $option ),
			[
				'context'   => 'options',
				'option'    => $option,
				'backtrace' => $backtrace_info['trace'],
				'backtrace_summary' => $backtrace_info['summary'],
			]
		);
		
		return $backtrace_info;
	}
	
	/**
	 * Log when an option is added.
	 *
	 * @param string $option Name of the option to add.
	 * @return array|void Backtrace information if logged, void otherwise.
	 */
	public function log_option_add( $option ) {
		if ( ! in_array( $option, $this->options_to_log, true ) ) {
			return;
		}
		
		// Check if SimpleLogger exists before using it.
		if ( ! function_exists( '\SimpleLogger' ) ) {
			return;
		}
		
		// Get backtrace information.
		$backtrace_info = $this->get_backtrace_info();
		
		// Log the addition.
		\SimpleLogger()->info(
			sprintf( 'Option "%s" added', $option ),
			[
				'context'   => 'options',
				'option'    => $option,
				'backtrace' => $backtrace_info['trace'],
				'backtrace_summary' => $backtrace_info['summary'],
			]
		);
		
		return $backtrace_info;
	}
}