1 files changed, 55 insertions, 0 deletions
diff --git a/apps/settings/lib/SetupChecks/LoggingLevel.php b/apps/settings/lib/SetupChecks/LoggingLevel.php
new file mode 100644
index 00000000000..b9e1dbe700d
--- /dev/null
+++ b/apps/settings/lib/SetupChecks/LoggingLevel.php
@@ -0,0 +1,55 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2025 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+namespace OCA\Settings\SetupChecks;
+
+use OCP\IConfig;
+use OCP\IL10N;
+use OCP\ILogger;
+use OCP\IURLGenerator;
+use OCP\SetupCheck\ISetupCheck;
+use OCP\SetupCheck\SetupResult;
+
+class LoggingLevel implements ISetupCheck {
+	public function __construct(
+		private IL10N $l10n,
+		private IConfig $config,
+		private IURLGenerator $urlGenerator,
+	) {
+	}
+
+	public function getName(): string {
+		return $this->l10n->t('Logging level');
+	}
+
+	public function getCategory(): string {
+		return 'system';
+	}
+
+	public function run(): SetupResult {
+		$configLogLevel = $this->config->getSystemValue('loglevel', ILogger::WARN);
+		if (!is_int($configLogLevel)
+			|| $configLogLevel < ILogger::DEBUG
+			|| $configLogLevel > ILogger::FATAL
+		) {
+			return SetupResult::error(
+				$this->l10n->t('The %1$s configuration option must be a valid integer value.', ['`loglevel`']),
+				$this->urlGenerator->linkToDocs('admin-logging'),
+			);
+		}
+
+		if ($configLogLevel === ILogger::DEBUG) {
+			return SetupResult::warning(
+				$this->l10n->t('The logging level is set to debug level. Use debug level only when you have a problem to diagnose, and then reset your log level to a less-verbose level as it outputs a lot of information, and can affect your server performance.'),
+				$this->urlGenerator->linkToDocs('admin-logging'),
+			);
+		}
+
+		return SetupResult::success($this->l10n->t('Logging level configured correctly.'));
+	}
+}