diff --git a/projects/plugins/debug-helper/.gitignore b/projects/plugins/debug-helper/.gitignore
index 57872d0f1e5f4..6e0ba0493bf7f 100644
--- a/projects/plugins/debug-helper/.gitignore
+++ b/projects/plugins/debug-helper/.gitignore
@@ -1 +1,2 @@
 /vendor/
+/scripts/wp-config.php
diff --git a/projects/plugins/debug-helper/changelog/add-debug-helper-coverage-logger b/projects/plugins/debug-helper/changelog/add-debug-helper-coverage-logger
new file mode 100644
index 0000000000000..7496196126bb6
--- /dev/null
+++ b/projects/plugins/debug-helper/changelog/add-debug-helper-coverage-logger
@@ -0,0 +1,4 @@
+Significance: minor
+Type: added
+
+Added a new module for coverage data logging.
diff --git a/projects/plugins/debug-helper/composer.json b/projects/plugins/debug-helper/composer.json
index 939361e7cac13..c2dc476056cd1 100644
--- a/projects/plugins/debug-helper/composer.json
+++ b/projects/plugins/debug-helper/composer.json
@@ -3,7 +3,6 @@
 	"description": "A plugin for mocking various states of the plugin to aid in Jetpack development. Not for production use.",
 	"type": "wordpress-plugin",
 	"license": "GPL-2.0-or-later",
-	"require": {},
 	"require-dev": {
 		"automattic/jetpack-changelogger": "@dev"
 	},
@@ -28,5 +27,8 @@
 		"changelogger": {
 			"link-template": "https://github.com/Automattic/jetpack-debug-helper/compare/v${old}...v${new}"
 		}
+	},
+	"require": {
+		"phpunit/php-code-coverage": "^11.0"
 	}
 }
diff --git a/projects/plugins/debug-helper/composer.lock b/projects/plugins/debug-helper/composer.lock
index 57d86b1e06f18..9a3569a980d24 100644
--- a/projects/plugins/debug-helper/composer.lock
+++ b/projects/plugins/debug-helper/composer.lock
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+                "shasum": ""
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+            "require": {
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+                "ext-json": "*",
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+            "description": "A PHP parser written in PHP",
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+                "php"
+            ],
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+                "url": "https://github.com/sebastianbergmann/php-code-coverage.git",
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+                }
+            ],
+            "description": "A small library for converting tokenized PHP source code into XML and potentially other formats",
+            "support": {
+                "issues": "https://github.com/theseer/tokenizer/issues",
+                "source": "https://github.com/theseer/tokenizer/tree/1.2.3"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/theseer",
+                    "type": "github"
+                }
+            ],
+            "time": "2024-03-03T12:36:25+00:00"
+        }
+    ],
     "packages-dev": [
         {
             "name": "automattic/jetpack-changelogger",
@@ -146,16 +744,16 @@
         },
         {
             "name": "symfony/console",
-            "version": "v7.2.1",
+            "version": "v7.2.5",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/console.git",
-                "reference": "fefcc18c0f5d0efe3ab3152f15857298868dc2c3"
+                "reference": "e51498ea18570c062e7df29d05a7003585b19b88"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/console/zipball/fefcc18c0f5d0efe3ab3152f15857298868dc2c3",
-                "reference": "fefcc18c0f5d0efe3ab3152f15857298868dc2c3",
+                "url": "https://api.github.com/repos/symfony/console/zipball/e51498ea18570c062e7df29d05a7003585b19b88",
+                "reference": "e51498ea18570c062e7df29d05a7003585b19b88",
                 "shasum": ""
             },
             "require": {
@@ -219,7 +817,7 @@
                 "terminal"
             ],
             "support": {
-                "source": "https://github.com/symfony/console/tree/v7.2.1"
+                "source": "https://github.com/symfony/console/tree/v7.2.5"
             },
             "funding": [
                 {
@@ -235,7 +833,7 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2024-12-11T03:49:26+00:00"
+            "time": "2025-03-12T08:11:12+00:00"
         },
         {
             "name": "symfony/deprecation-contracts",
@@ -624,16 +1222,16 @@
         },
         {
             "name": "symfony/process",
-            "version": "v7.2.4",
+            "version": "v7.2.5",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/process.git",
-                "reference": "d8f411ff3c7ddc4ae9166fb388d1190a2df5b5cf"
+                "reference": "87b7c93e57df9d8e39a093d32587702380ff045d"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/process/zipball/d8f411ff3c7ddc4ae9166fb388d1190a2df5b5cf",
-                "reference": "d8f411ff3c7ddc4ae9166fb388d1190a2df5b5cf",
+                "url": "https://api.github.com/repos/symfony/process/zipball/87b7c93e57df9d8e39a093d32587702380ff045d",
+                "reference": "87b7c93e57df9d8e39a093d32587702380ff045d",
                 "shasum": ""
             },
             "require": {
@@ -665,7 +1263,7 @@
             "description": "Executes commands in sub-processes",
             "homepage": "https://symfony.com",
             "support": {
-                "source": "https://github.com/symfony/process/tree/v7.2.4"
+                "source": "https://github.com/symfony/process/tree/v7.2.5"
             },
             "funding": [
                 {
@@ -681,7 +1279,7 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2025-02-05T08:33:46+00:00"
+            "time": "2025-03-13T12:21:46+00:00"
         },
         {
             "name": "symfony/service-contracts",
diff --git a/projects/plugins/debug-helper/modules/class-coverage-logger.php b/projects/plugins/debug-helper/modules/class-coverage-logger.php
new file mode 100644
index 0000000000000..13d319060bef7
--- /dev/null
+++ b/projects/plugins/debug-helper/modules/class-coverage-logger.php
@@ -0,0 +1,235 @@
+<?php
+/**
+ * The Coverage Logger file contains the class `Coverage_Logger` that logs coverage data.
+ *
+ * @package automattic/jetpack-debug-helper
+ */
+
+namespace Automattic\Jetpack\Debug_Helper;
+
+/**
+ * Class Coverage_Logger
+ *
+ * Handles logging of coverage data that Jetpack plugins generate.
+ *
+ * @package Automattic\Jetpack\Debug_Helper
+ */
+class Coverage_Logger {
+
+	const RUNTIME_TABLE_NAME = 'jetpack_runtime_coverage_data';
+
+	/**
+	 * Starts the coverage logging process in case the needed criteria match.
+	 */
+	public static function maybe_start_logging() {
+		if ( function_exists( 'xdebug_start_code_coverage' ) ) {
+			self::maybe_upsert_database();
+
+			xdebug_start_code_coverage();
+			add_action( 'shutdown', array( self::class, 'log_coverage_results' ), 100000 );
+		}
+	}
+
+	/**
+	 * XMLRPC_Logger constructor.
+	 * Hooks the XML-RPC logging function into WordPress's init action.
+	 */
+	public function __construct() {
+
+		add_action( 'admin_menu', array( $this, 'register_submenu_page' ), 1000 );
+		add_action( 'admin_enqueue_scripts', array( $this, 'enqueue_scripts' ) );
+
+		// POST actions
+		add_action( 'admin_post_clear_real_coverage', array( $this, 'admin_post_clear_real_coverage' ) );
+	}
+
+	/**
+	 * Add submenu item.
+	 */
+	public function register_submenu_page() {
+		add_submenu_page(
+			'jetpack-debug-tools',
+			'Coverage Logger',
+			'Coverage Logger',
+			'manage_options',
+			'coverage-logger',
+			array( $this, 'render_ui' ),
+			99
+		);
+	}
+
+	/**
+	 * Some custom style.
+	 */
+	public function enqueue_scripts() {
+		$screen = get_current_screen();
+		if ( $screen->id !== 'jetpack-debug_page_modules-helper' ) {
+			return;
+		}
+		?>
+			<style>
+				table {
+					width: 50%;
+					float: left;
+					margin-bottom: 50px;
+				}
+				th {
+					text-align: left;
+					font-size: 110%;
+				}
+			</style>
+		<?php
+	}
+
+	/**
+	 * Renders the UI.
+	 */
+	public function render_ui() {
+		$html  = '<h1>Coverage difference logger</h1>';
+		$html .= '<p>Allows you to see what code gets actually run and compare it to existing test coverage.</p><hr />';
+
+		?>
+
+		<div><?php echo wp_kses_post( $html ); ?></div>
+
+		<form action="<?php echo esc_url( admin_url( 'admin-post.php' ) ); ?>" method="post">
+			<p>Clear existing real coverage data:
+				<input type="hidden" name="action" value="clear_real_coverage">
+				<?php wp_nonce_field( 'clear-real-coverage' ); ?>
+				<input type="submit" value="Clear" class="button button-secondary button-small">
+			</p>
+		</form>
+		<?php
+	}
+
+	/**
+	 * Purge real coverage data from the coverage table.
+	 */
+	public function admin_post_clear_real_coverage() {
+		global $wpdb;
+
+		check_admin_referer( 'clear-real-coverage' );
+
+		$wpdb->query( sprintf( 'TRUNCATE TABLE `%s`', $wpdb->prefix . self::RUNTIME_TABLE_NAME ) ); // phpcs:ignore WordPress.DB
+
+		$this->admin_post_redirect_referrer();
+	}
+
+	/**
+	 * Redirect back to the referrer.
+	 */
+	public function admin_post_redirect_referrer() {
+		if ( wp_get_referer() ) {
+			wp_safe_redirect( wp_get_referer() );
+		} else {
+			wp_safe_redirect( get_home_url() );
+		}
+	}
+
+	/**
+	 * Saves coverage results into a file.
+	 */
+	public static function log_coverage_results() {
+		global $wpdb;
+
+		$coverage_data = xdebug_get_code_coverage();
+
+		$sql = sprintf( 'INSERT IGNORE INTO `%s` (path, line) VALUES ', $wpdb->prefix . self::RUNTIME_TABLE_NAME );
+
+		foreach ( $coverage_data as $file => $lines ) {
+			$path = substr( $file, strlen( ABSPATH ) );
+
+			if ( ! str_starts_with( $path, 'wp-content/plugins/jetpack' ) ) {
+				continue;
+			}
+
+			if ( false !== strpos( $path, '/vendor/' ) ) {
+				continue;
+			}
+
+			$path = substr( $path, strlen( 'wp-content/plugins/' ) );
+
+			$vendor_pos = strpos( $path, 'jetpack_vendor' );
+			if ( false !== $vendor_pos ) {
+				$path = substr( $path, $vendor_pos + strlen( 'jetpack_vendor/automattic/' ) );
+			}
+
+			foreach ( $lines as $line => $count ) {
+				for ( $i = 0; $i < $count; $i++ ) {
+					$sql .= $wpdb->prepare( '( %s, %d ),', $path, $line );
+				}
+			}
+		}
+
+		$wpdb->query( rtrim( $sql, ',' ) ); // phpcs:ignore WordPress.DB -- We are preparing the query before this.
+	}
+
+	/**
+	 * Uses the dbDelta function to either update, create, or leave the existing
+	 * database in peace.
+	 */
+	protected static function maybe_upsert_database() {
+		global $wpdb;
+
+		$charset_collate = $wpdb->get_charset_collate();
+		$table_name      = $wpdb->prefix . self::RUNTIME_TABLE_NAME;
+
+		$sql = array(
+			"CREATE TABLE $table_name (
+  id mediumint(9) NOT NULL AUTO_INCREMENT,
+  path varchar(255),
+  line int,
+  PRIMARY KEY (id),
+  UNIQUE KEY `unique_path` (path, line)
+) $charset_collate;",
+		);
+
+		require_once ABSPATH . 'wp-admin/includes/upgrade.php';
+		dbDelta( $sql );
+	}
+
+	/**
+	 * Returns an SQL string for getting the coverage diff results.
+	 */
+	protected function get_coverage_diff() {
+		return '
+SELECT
+    runtime.path AS file_path,
+    runtime.lines_covered AS runtime_coverage,
+    test.line AS test_coverage,
+    runtime.lines_covered - test.line AS coverage_difference
+        FROM
+    (
+        SELECT
+            path,
+            COUNT(DISTINCT line) AS lines_covered
+        FROM
+            wp_jetpack_runtime_coverage_data
+        GROUP BY
+            path
+    ) AS runtime
+    INNER JOIN
+    (
+        SELECT
+            path,
+            line
+        FROM
+            wp_jetpack_test_coverage_data
+    ) AS test
+    ON runtime.path = test.path
+    ORDER BY coverage_difference
+';
+	}
+}
+
+if ( isset( $_COOKIE['jetpack_enable_coverage_logging'] ) ) {
+	Coverage_Logger::maybe_start_logging();
+}
+
+add_action(
+	'plugins_loaded',
+	function () {
+		new Coverage_Logger();
+	},
+	1000
+);
diff --git a/projects/plugins/debug-helper/plugin.php b/projects/plugins/debug-helper/plugin.php
index 442db0b89f04c..447f7f05059cd 100644
--- a/projects/plugins/debug-helper/plugin.php
+++ b/projects/plugins/debug-helper/plugin.php
@@ -114,6 +114,11 @@
 		'name'        => 'XMLRPC Logger',
 		'description' => 'Logs incoming XMLRPC requests into the debug.log file.',
 	),
+	'coverage-logger'           => array(
+		'file'        => 'class-coverage-logger.php',
+		'name'        => 'Coverage Logger',
+		'description' => 'Logs coverage data.',
+	),
 	'xmlrpc-blocker'            => array(
 		'file'        => 'class-xmlrpc-blocker.php',
 		'name'        => 'Broken XML-RPC',
diff --git a/projects/plugins/debug-helper/scripts/load-coverage-data.php b/projects/plugins/debug-helper/scripts/load-coverage-data.php
new file mode 100644
index 0000000000000..80688c8f119f3
--- /dev/null
+++ b/projects/plugins/debug-helper/scripts/load-coverage-data.php
@@ -0,0 +1,69 @@
+<?php // phpcs:ignore Squiz.Commenting
+// phpcs:disable WordPress.DB
+
+if ( ! file_exists( __DIR__ . '/wp-config.php' ) ) {
+	echo 'This script needs a WordPress config file for database configuration to work.' . PHP_EOL;
+	echo 'You can copy your WordPress configuration part where it defines database connection and table prefix.' . PHP_EOL;
+	echo 'Put them in a wp-config.php file in this folder, just don\'t forget to remove it when you\'re done.' . PHP_EOL;
+	exit( 1 );
+}
+
+require_once __DIR__ . '/wp-config.php';
+require_once __DIR__ . '/../vendor/autoload.php';
+
+/**
+ * Requires a serialized coverage data object file generated by PHPUnit.
+ *
+ * @return SebastianBergmann\CodeCoverage\CodeCoverage
+ */
+function load_coverage_data() {
+	return require __DIR__ . '/php-combined.cov';
+}
+
+$data = load_coverage_data();
+
+$coverage = $data->getData();
+
+$data = array();
+foreach ( $coverage->lineCoverage() as $file => $lines ) {
+	foreach ( $lines as $line => $testcases ) {
+		if ( empty( $testcases ) ) {
+
+			// This means no tests are covering this line.
+			continue;
+		}
+
+		$data[] = array(
+			'file' => $file,
+			'line' => $line,
+		);
+	}
+}
+
+$table = $table_prefix . 'jetpack_test_coverage_data'; // phpcs:ignore VariableAnalysis -- required from wp-config.php
+
+mysqli_report( MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT );
+$dbh = new mysqli( DB_HOST, DB_USER, DB_PASSWORD, DB_NAME );
+
+$create_table = sprintf(
+	'CREATE TABLE IF NOT EXISTS `%s` (
+ id int NOT NULL AUTO_INCREMENT,
+ path varchar(255),
+ line int,
+ PRIMARY KEY (id),
+ UNIQUE KEY `unique_path` (path, line)
+ )',
+	$table
+);
+
+$dbh->query( $create_table );
+
+$sql = sprintf( 'INSERT IGNORE INTO `%s` (path, line) VALUES ', $table );
+
+foreach ( $data as $file ) {
+	$sql .= sprintf( "( '%s', %d ),", $file['file'], $file['line'] );
+}
+
+$dbh->query( rtrim( $sql, ',' ) ); // phpcs:ignore WordPress.DB -- We are preparing the query before this.
+
+$dbh->close();