diff --git a/apps/comments/appinfo/info.xml b/apps/comments/appinfo/info.xml
index 956a8fe39142e..7510bbdf53dfb 100644
--- a/apps/comments/appinfo/info.xml
+++ b/apps/comments/appinfo/info.xml
@@ -38,6 +38,10 @@
 		</providers>
 	</activity>
 
+	<openmetrics>
+		<exporter>OCA\Comments\OpenMetrics\Comments</exporter>
+	</openmetrics>
+
 	<collaboration>
 		<plugins>
 			<plugin type="autocomplete-sort">OCA\Comments\Collaboration\CommentersSorter</plugin>
diff --git a/apps/comments/composer/composer/autoload_classmap.php b/apps/comments/composer/composer/autoload_classmap.php
index 6db5c6a232b6a..22ed3a35542de 100644
--- a/apps/comments/composer/composer/autoload_classmap.php
+++ b/apps/comments/composer/composer/autoload_classmap.php
@@ -22,5 +22,6 @@
     'OCA\\Comments\\MaxAutoCompleteResultsInitialState' => $baseDir . '/../lib/MaxAutoCompleteResultsInitialState.php',
     'OCA\\Comments\\Notification\\Listener' => $baseDir . '/../lib/Notification/Listener.php',
     'OCA\\Comments\\Notification\\Notifier' => $baseDir . '/../lib/Notification/Notifier.php',
+    'OCA\\Comments\\OpenMetrics\\Comments' => $baseDir . '/../lib/OpenMetrics/Comments.php',
     'OCA\\Comments\\Search\\CommentsSearchProvider' => $baseDir . '/../lib/Search/CommentsSearchProvider.php',
 );
diff --git a/apps/comments/composer/composer/autoload_static.php b/apps/comments/composer/composer/autoload_static.php
index 60359abb6d0e6..520b640625077 100644
--- a/apps/comments/composer/composer/autoload_static.php
+++ b/apps/comments/composer/composer/autoload_static.php
@@ -37,6 +37,7 @@ class ComposerStaticInitComments
         'OCA\\Comments\\MaxAutoCompleteResultsInitialState' => __DIR__ . '/..' . '/../lib/MaxAutoCompleteResultsInitialState.php',
         'OCA\\Comments\\Notification\\Listener' => __DIR__ . '/..' . '/../lib/Notification/Listener.php',
         'OCA\\Comments\\Notification\\Notifier' => __DIR__ . '/..' . '/../lib/Notification/Notifier.php',
+        'OCA\\Comments\\OpenMetrics\\Comments' => __DIR__ . '/..' . '/../lib/OpenMetrics/Comments.php',
         'OCA\\Comments\\Search\\CommentsSearchProvider' => __DIR__ . '/..' . '/../lib/Search/CommentsSearchProvider.php',
     );
 
diff --git a/apps/comments/lib/OpenMetrics/Comments.php b/apps/comments/lib/OpenMetrics/Comments.php
new file mode 100644
index 0000000000000..38cfd6bb104e3
--- /dev/null
+++ b/apps/comments/lib/OpenMetrics/Comments.php
@@ -0,0 +1,52 @@
+<?php
+
+/**
+ * SPDX-FileCopyrightText: 2025 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+namespace OCA\Comments\OpenMetrics;
+
+use Generator;
+use OC\DB\Connection;
+use OCP\OpenMetrics\IMetricFamily;
+use OCP\OpenMetrics\Metric;
+use OCP\OpenMetrics\MetricTypes;
+use Override;
+
+class Comments implements IMetricFamily {
+	public function __construct(
+		private Connection $connection,
+	) {
+	}
+
+	#[Override]
+	public function name(): string {
+		return 'comments';
+	}
+
+	#[Override]
+	public function type(): MetricTypes {
+		return MetricTypes::gauge;
+	}
+
+	#[Override]
+	public function unit(): string {
+		return 'comments';
+	}
+
+	#[Override]
+	public function help(): string {
+		return 'Comments counts';
+	}
+
+	#[Override]
+	public function metrics(): Generator {
+		$qb = $this->connection->getQueryBuilder();
+		$result = $qb->select($qb->func()->count())
+			->from('comments')
+			->where($qb->expr()->eq('verb', $qb->expr()->literal('comment')))
+			->executeQuery();
+
+		yield new Metric($result->fetchOne(), [], time());
+	}
+}
diff --git a/apps/files_sharing/appinfo/info.xml b/apps/files_sharing/appinfo/info.xml
index 9368225fa2436..c6d60c7f5c114 100644
--- a/apps/files_sharing/appinfo/info.xml
+++ b/apps/files_sharing/appinfo/info.xml
@@ -87,4 +87,8 @@ Turning the feature off removes shared files and folders on the server for all s
 	<public>
 		<files>public.php</files>
 	</public>
+
+	<openmetrics>
+		<exporter>OCA\Files_Sharing\OpenMetrics\SharesCount</exporter>
+	</openmetrics>
 </info>
diff --git a/apps/files_sharing/composer/composer/autoload_classmap.php b/apps/files_sharing/composer/composer/autoload_classmap.php
index 48f197f9bf937..f29b6c341dc50 100644
--- a/apps/files_sharing/composer/composer/autoload_classmap.php
+++ b/apps/files_sharing/composer/composer/autoload_classmap.php
@@ -88,6 +88,7 @@
     'OCA\\Files_Sharing\\MountProvider' => $baseDir . '/../lib/MountProvider.php',
     'OCA\\Files_Sharing\\Notification\\Listener' => $baseDir . '/../lib/Notification/Listener.php',
     'OCA\\Files_Sharing\\Notification\\Notifier' => $baseDir . '/../lib/Notification/Notifier.php',
+    'OCA\\Files_Sharing\\OpenMetrics\\SharesCount' => $baseDir . '/../lib/OpenMetrics/SharesCount.php',
     'OCA\\Files_Sharing\\OrphanHelper' => $baseDir . '/../lib/OrphanHelper.php',
     'OCA\\Files_Sharing\\ResponseDefinitions' => $baseDir . '/../lib/ResponseDefinitions.php',
     'OCA\\Files_Sharing\\Scanner' => $baseDir . '/../lib/Scanner.php',
diff --git a/apps/files_sharing/composer/composer/autoload_static.php b/apps/files_sharing/composer/composer/autoload_static.php
index 110a64fb3acfa..e43a9298a33e3 100644
--- a/apps/files_sharing/composer/composer/autoload_static.php
+++ b/apps/files_sharing/composer/composer/autoload_static.php
@@ -103,6 +103,7 @@ class ComposerStaticInitFiles_Sharing
         'OCA\\Files_Sharing\\MountProvider' => __DIR__ . '/..' . '/../lib/MountProvider.php',
         'OCA\\Files_Sharing\\Notification\\Listener' => __DIR__ . '/..' . '/../lib/Notification/Listener.php',
         'OCA\\Files_Sharing\\Notification\\Notifier' => __DIR__ . '/..' . '/../lib/Notification/Notifier.php',
+        'OCA\\Files_Sharing\\OpenMetrics\\SharesCount' => __DIR__ . '/..' . '/../lib/OpenMetrics/SharesCount.php',
         'OCA\\Files_Sharing\\OrphanHelper' => __DIR__ . '/..' . '/../lib/OrphanHelper.php',
         'OCA\\Files_Sharing\\ResponseDefinitions' => __DIR__ . '/..' . '/../lib/ResponseDefinitions.php',
         'OCA\\Files_Sharing\\Scanner' => __DIR__ . '/..' . '/../lib/Scanner.php',
diff --git a/apps/files_sharing/lib/OpenMetrics/SharesCount.php b/apps/files_sharing/lib/OpenMetrics/SharesCount.php
new file mode 100644
index 0000000000000..86246db1ac0f8
--- /dev/null
+++ b/apps/files_sharing/lib/OpenMetrics/SharesCount.php
@@ -0,0 +1,75 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2025 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace OCA\Files_Sharing\OpenMetrics;
+
+use Generator;
+use OCP\DB\QueryBuilder\IQueryBuilder;
+use OCP\IDBConnection;
+use OCP\OpenMetrics\IMetricFamily;
+use OCP\OpenMetrics\Metric;
+use OCP\OpenMetrics\MetricTypes;
+use OCP\Share\IShare;
+use Override;
+
+/**
+ * Count shares by type
+ * @since 33.0.0
+ */
+class SharesCount implements IMetricFamily {
+	public function __construct(
+		private IDBConnection $connection,
+	) {
+	}
+
+	#[Override]
+	public function name(): string {
+		return 'shares';
+	}
+
+	#[Override]
+	public function type(): MetricTypes {
+		return MetricTypes::gauge;
+	}
+
+	#[Override]
+	public function unit(): string {
+		return 'shares';
+	}
+
+	#[Override]
+	public function help(): string {
+		return 'Number of shares';
+	}
+
+	#[Override]
+	public function metrics(): Generator {
+		$types = [
+			IShare::TYPE_USER => 'user',
+			IShare::TYPE_GROUP => 'group',
+			IShare::TYPE_LINK => 'link',
+			IShare::TYPE_EMAIL => 'email',
+		];
+		$qb = $this->connection->getQueryBuilder();
+		$result = $qb->select($qb->func()->count('*', 'count'), 'share_type')
+			->from('share')
+			->where($qb->expr()->in('share_type', $qb->createNamedParameter(array_keys($types), IQueryBuilder::PARAM_INT_ARRAY)))
+			->groupBy('share_type')
+			->executeQuery();
+
+		if ($result->rowCount() === 0) {
+			yield new Metric(0);
+			return;
+		}
+
+		while ($row = $result->fetch()) {
+			yield new Metric($row['count'], ['type' => $types[$row['share_type']]]);
+		}
+	}
+}
diff --git a/config/config.sample.php b/config/config.sample.php
index d36eac3ed88c1..0da5c1e6e3241 100644
--- a/config/config.sample.php
+++ b/config/config.sample.php
@@ -2892,4 +2892,29 @@
 	 * Defaults to `\OC::$SERVERROOT . '/resources/config/ca-bundle.crt'`.
 	 */
 	'default_certificates_bundle_path' => \OC::$SERVERROOT . '/resources/config/ca-bundle.crt',
+
+	/**
+	 * OpenMetrics skipped exporters
+	 * Allows to skip some exporters in the OpenMetrics endpoint ``/metrics``.
+	 *
+	 * Default to ``[]`` (empty array)
+	 */
+	'openmetrics_skipped_classes' => [
+		'OC\OpenMetrics\Exporters\FilesByType',
+		'OCA\Files_Sharing\OpenMetrics\SharesCount',
+	],
+
+	/**
+	 * OpenMetrics allowed client IP addresses
+	 * Restricts the IP addresses able to make requests on the ``/metrics`` endpoint.
+	 *
+	 * Keep this list as restrictive as possible as metrics can consume a lot of resources.
+	 *
+	 * Default to ``[127.0.0.0/16', '::1/128]`` (allow loopback interface only)
+	 */
+	'openmetrics_allowed_clients' => [
+		'192.168.0.0/16',
+		'fe80::/10',
+		'10.0.0.1',
+	],
 ];
diff --git a/core/Controller/OpenMetricsController.php b/core/Controller/OpenMetricsController.php
new file mode 100644
index 0000000000000..0f70db5626992
--- /dev/null
+++ b/core/Controller/OpenMetricsController.php
@@ -0,0 +1,152 @@
+<?php
+
+declare(strict_types=1);
+/**
+ * SPDX-FileCopyrightText: 2025 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+namespace OC\Core\Controller;
+
+use OC\OpenMetrics\Exporter;
+use OC\Security\Ip\Address;
+use OC\Security\Ip\Range;
+use OCP\AppFramework\Controller;
+use OCP\AppFramework\Http;
+use OCP\AppFramework\Http\Attribute\FrontpageRoute;
+use OCP\AppFramework\Http\Attribute\NoCSRFRequired;
+use OCP\AppFramework\Http\Attribute\PublicPage;
+use OCP\IConfig;
+use OCP\IRequest;
+use OCP\OpenMetrics\Metric;
+use OCP\OpenMetrics\MetricTypes;
+use OCP\OpenMetrics\MetricValue;
+use Psr\Log\LoggerInterface;
+
+/**
+ * OpenMetrics controller
+ *
+ * Gather and display metrics
+ *
+ * @package OC\Core\Controller
+ */
+class OpenMetricsController extends Controller {
+	public function __construct(
+		string $appName,
+		IRequest $request,
+		private IConfig $config,
+		private Exporter $exporter,
+		private LoggerInterface $logger,
+	) {
+		parent::__construct($appName, $request);
+	}
+
+	#[NoCSRFRequired]
+	#[PublicPage]
+	#[FrontpageRoute(verb: 'GET', url: '/metrics')]
+	public function export(): Http\Response {
+		if (!$this->isRemoteAddressAllowed()) {
+			return new Http\Response(Http::STATUS_FORBIDDEN);
+		}
+
+		return new Http\StreamTraversableResponse(
+			$this->generate(),
+			Http::STATUS_OK,
+			[
+				'Content-Type' => 'application/openmetrics-text; version=1.0.0; charset=utf-8',
+			]
+		);
+	}
+
+	private function isRemoteAddressAllowed(): bool {
+		$clientAddress = new Address($this->request->getRemoteAddress());
+		$allowedRanges = $this->config->getSystemValue('openmetrics_allowed_clients', ['127.0.0.0/16', '::1/128']);
+		if (!is_array($allowedRanges)) {
+			$this->logger->warning('Invalid configuration for "openmetrics_allowed_clients"');
+			return false;
+		}
+
+		foreach ($allowedRanges as $range) {
+			$range = new Range($range);
+			if ($range->contains($clientAddress)) {
+				return true;
+			}
+		}
+
+		return false;
+	}
+
+	private function generate(): \Generator {
+		$exporter = $this->exporter;
+
+		foreach ($exporter() as $family) {
+			$output = '';
+			$name = $family->name();
+			if ($family->type() !== MetricTypes::unknown) {
+				$output = '# TYPE nextcloud_' . $name . ' ' . $family->type()->name . "\n";
+			}
+			if ($family->unit() !== '') {
+				$output .= '# UNIT nextcloud_' . $name . ' ' . $family->unit() . "\n";
+			}
+			if ($family->help() !== '') {
+				$output .= '# HELP nextcloud_' . $name . ' ' . $family->help() . "\n";
+			}
+			foreach ($family->metrics() as $metric) {
+				$output .= 'nextcloud_' . $name . $this->formatLabels($metric) . ' ' . $this->formatValue($metric);
+				if ($metric->timestamp !== null) {
+					$output .= ' ' . $this->formatTimestamp($metric);
+				}
+				$output .= "\n";
+			}
+			$output .= "\n";
+
+			yield $output;
+		}
+
+		$elapsed = (string)(microtime(true) - $_SERVER['REQUEST_TIME_FLOAT']);
+		yield <<<SUMMARY
+			# TYPE nextcloud_exporter_duration gauge
+			# UNIT nextcloud_exporter_duration seconds
+			# HELP nextcloud_exporter_duration Exporter run time
+			nextcloud_exporter_duration $elapsed
+
+			# EOF
+
+			SUMMARY;
+	}
+
+	private function formatLabels(Metric $metric): string {
+		if (empty($metric->labels)) {
+			return '';
+		}
+
+		$labels = [];
+		foreach ($metric->labels as $label => $value) {
+			$labels[] .= $label . '=' . $this->escapeString((string)$value);
+		}
+
+		return '{' . implode(',', $labels) . '}';
+	}
+
+	private function escapeString(string $string): string {
+		return json_encode(
+			$string,
+			JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES | JSON_THROW_ON_ERROR,
+			1
+		);
+	}
+
+	private function formatValue(Metric $metric): string {
+		if (is_bool($metric->value)) {
+			return $metric->value ? '1' : '0';
+		}
+		if ($metric->value instanceof MetricValue) {
+			return $metric->value->value;
+		}
+
+		return (string)$metric->value;
+	}
+
+	private function formatTimestamp(Metric $metric): string {
+		return (string)$metric->timestamp;
+	}
+}
diff --git a/core/openapi-administration.json b/core/openapi-administration.json
index f482f4992c131..569b6f9e42184 100644
--- a/core/openapi-administration.json
+++ b/core/openapi-administration.json
@@ -659,6 +659,10 @@
         {
             "name": "ocm",
             "description": "Controller about the endpoint /ocm-provider/"
+        },
+        {
+            "name": "open_metrics",
+            "description": "OpenMetrics controller Gather and display metrics"
         }
     ]
 }
diff --git a/core/openapi-ex_app.json b/core/openapi-ex_app.json
index 647c9fcd5d916..927a7d788f6b3 100644
--- a/core/openapi-ex_app.json
+++ b/core/openapi-ex_app.json
@@ -1609,6 +1609,10 @@
         {
             "name": "ocm",
             "description": "Controller about the endpoint /ocm-provider/"
+        },
+        {
+            "name": "open_metrics",
+            "description": "OpenMetrics controller Gather and display metrics"
         }
     ]
 }
diff --git a/core/openapi-full.json b/core/openapi-full.json
index 2116be274a863..e6e456e244289 100644
--- a/core/openapi-full.json
+++ b/core/openapi-full.json
@@ -12238,6 +12238,10 @@
         {
             "name": "ocm",
             "description": "Controller about the endpoint /ocm-provider/"
+        },
+        {
+            "name": "open_metrics",
+            "description": "OpenMetrics controller Gather and display metrics"
         }
     ]
 }
diff --git a/core/openapi.json b/core/openapi.json
index 8b2b725d5769c..11d0318c837cc 100644
--- a/core/openapi.json
+++ b/core/openapi.json
@@ -10379,6 +10379,10 @@
         {
             "name": "ocm",
             "description": "Controller about the endpoint /ocm-provider/"
+        },
+        {
+            "name": "open_metrics",
+            "description": "OpenMetrics controller Gather and display metrics"
         }
     ]
 }
diff --git a/lib/composer/composer/LICENSE b/lib/composer/composer/LICENSE
index 62ecfd8d0046b..da27360bf626e 100644
--- a/lib/composer/composer/LICENSE
+++ b/lib/composer/composer/LICENSE
@@ -1,3 +1,4 @@
+
 Copyright (c) Nils Adermann, Jordi Boggiano
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
diff --git a/lib/composer/composer/autoload_classmap.php b/lib/composer/composer/autoload_classmap.php
index 0b6dd29f2040b..4c41470a07d9f 100644
--- a/lib/composer/composer/autoload_classmap.php
+++ b/lib/composer/composer/autoload_classmap.php
@@ -122,6 +122,7 @@
     'OCP\\AppFramework\\Http\\Response' => $baseDir . '/lib/public/AppFramework/Http/Response.php',
     'OCP\\AppFramework\\Http\\StandaloneTemplateResponse' => $baseDir . '/lib/public/AppFramework/Http/StandaloneTemplateResponse.php',
     'OCP\\AppFramework\\Http\\StreamResponse' => $baseDir . '/lib/public/AppFramework/Http/StreamResponse.php',
+    'OCP\\AppFramework\\Http\\StreamTraversableResponse' => $baseDir . '/lib/public/AppFramework/Http/StreamTraversableResponse.php',
     'OCP\\AppFramework\\Http\\StrictContentSecurityPolicy' => $baseDir . '/lib/public/AppFramework/Http/StrictContentSecurityPolicy.php',
     'OCP\\AppFramework\\Http\\StrictEvalContentSecurityPolicy' => $baseDir . '/lib/public/AppFramework/Http/StrictEvalContentSecurityPolicy.php',
     'OCP\\AppFramework\\Http\\StrictInlineContentSecurityPolicy' => $baseDir . '/lib/public/AppFramework/Http/StrictInlineContentSecurityPolicy.php',
@@ -724,6 +725,10 @@
     'OCP\\OCM\\IOCMProvider' => $baseDir . '/lib/public/OCM/IOCMProvider.php',
     'OCP\\OCM\\IOCMResource' => $baseDir . '/lib/public/OCM/IOCMResource.php',
     'OCP\\OCS\\IDiscoveryService' => $baseDir . '/lib/public/OCS/IDiscoveryService.php',
+    'OCP\\OpenMetrics\\IMetricFamily' => $baseDir . '/lib/public/OpenMetrics/IMetricFamily.php',
+    'OCP\\OpenMetrics\\Metric' => $baseDir . '/lib/public/OpenMetrics/Metric.php',
+    'OCP\\OpenMetrics\\MetricTypes' => $baseDir . '/lib/public/OpenMetrics/MetricTypes.php',
+    'OCP\\OpenMetrics\\MetricValue' => $baseDir . '/lib/public/OpenMetrics/MetricValue.php',
     'OCP\\PreConditionNotMetException' => $baseDir . '/lib/public/PreConditionNotMetException.php',
     'OCP\\Preview\\BeforePreviewFetchedEvent' => $baseDir . '/lib/public/Preview/BeforePreviewFetchedEvent.php',
     'OCP\\Preview\\IMimeIconProvider' => $baseDir . '/lib/public/Preview/IMimeIconProvider.php',
@@ -1420,6 +1425,7 @@
     'OC\\Core\\Controller\\OCJSController' => $baseDir . '/core/Controller/OCJSController.php',
     'OC\\Core\\Controller\\OCMController' => $baseDir . '/core/Controller/OCMController.php',
     'OC\\Core\\Controller\\OCSController' => $baseDir . '/core/Controller/OCSController.php',
+    'OC\\Core\\Controller\\OpenMetricsController' => $baseDir . '/core/Controller/OpenMetricsController.php',
     'OC\\Core\\Controller\\PreviewController' => $baseDir . '/core/Controller/PreviewController.php',
     'OC\\Core\\Controller\\ProfileApiController' => $baseDir . '/core/Controller/ProfileApiController.php',
     'OC\\Core\\Controller\\RecommendedAppsController' => $baseDir . '/core/Controller/RecommendedAppsController.php',
@@ -1893,6 +1899,17 @@
     'OC\\OCS\\CoreCapabilities' => $baseDir . '/lib/private/OCS/CoreCapabilities.php',
     'OC\\OCS\\DiscoveryService' => $baseDir . '/lib/private/OCS/DiscoveryService.php',
     'OC\\OCS\\Provider' => $baseDir . '/lib/private/OCS/Provider.php',
+    'OC\\OpenMetrics\\Exporter' => $baseDir . '/lib/private/OpenMetrics/Exporter.php',
+    'OC\\OpenMetrics\\Exporters\\ActiveSessions' => $baseDir . '/lib/private/OpenMetrics/Exporters/ActiveSessions.php',
+    'OC\\OpenMetrics\\Exporters\\ActiveUsers' => $baseDir . '/lib/private/OpenMetrics/Exporters/ActiveUsers.php',
+    'OC\\OpenMetrics\\Exporters\\AppsCount' => $baseDir . '/lib/private/OpenMetrics/Exporters/AppsCount.php',
+    'OC\\OpenMetrics\\Exporters\\AppsInfo' => $baseDir . '/lib/private/OpenMetrics/Exporters/AppsInfo.php',
+    'OC\\OpenMetrics\\Exporters\\Cached' => $baseDir . '/lib/private/OpenMetrics/Exporters/Cached.php',
+    'OC\\OpenMetrics\\Exporters\\FilesByType' => $baseDir . '/lib/private/OpenMetrics/Exporters/FilesByType.php',
+    'OC\\OpenMetrics\\Exporters\\InstanceInfo' => $baseDir . '/lib/private/OpenMetrics/Exporters/InstanceInfo.php',
+    'OC\\OpenMetrics\\Exporters\\Maintenance' => $baseDir . '/lib/private/OpenMetrics/Exporters/Maintenance.php',
+    'OC\\OpenMetrics\\Exporters\\RunningJobs' => $baseDir . '/lib/private/OpenMetrics/Exporters/RunningJobs.php',
+    'OC\\OpenMetrics\\Exporters\\UsersByBackend' => $baseDir . '/lib/private/OpenMetrics/Exporters/UsersByBackend.php',
     'OC\\PhoneNumberUtil' => $baseDir . '/lib/private/PhoneNumberUtil.php',
     'OC\\PreviewManager' => $baseDir . '/lib/private/PreviewManager.php',
     'OC\\PreviewNotAvailableException' => $baseDir . '/lib/private/PreviewNotAvailableException.php',
diff --git a/lib/composer/composer/autoload_static.php b/lib/composer/composer/autoload_static.php
index 9c34d2cd4debd..5abfbd4a325b4 100644
--- a/lib/composer/composer/autoload_static.php
+++ b/lib/composer/composer/autoload_static.php
@@ -163,6 +163,7 @@ class ComposerStaticInit749170dad3f5e7f9ca158f5a9f04f6a2
         'OCP\\AppFramework\\Http\\Response' => __DIR__ . '/../../..' . '/lib/public/AppFramework/Http/Response.php',
         'OCP\\AppFramework\\Http\\StandaloneTemplateResponse' => __DIR__ . '/../../..' . '/lib/public/AppFramework/Http/StandaloneTemplateResponse.php',
         'OCP\\AppFramework\\Http\\StreamResponse' => __DIR__ . '/../../..' . '/lib/public/AppFramework/Http/StreamResponse.php',
+        'OCP\\AppFramework\\Http\\StreamTraversableResponse' => __DIR__ . '/../../..' . '/lib/public/AppFramework/Http/StreamTraversableResponse.php',
         'OCP\\AppFramework\\Http\\StrictContentSecurityPolicy' => __DIR__ . '/../../..' . '/lib/public/AppFramework/Http/StrictContentSecurityPolicy.php',
         'OCP\\AppFramework\\Http\\StrictEvalContentSecurityPolicy' => __DIR__ . '/../../..' . '/lib/public/AppFramework/Http/StrictEvalContentSecurityPolicy.php',
         'OCP\\AppFramework\\Http\\StrictInlineContentSecurityPolicy' => __DIR__ . '/../../..' . '/lib/public/AppFramework/Http/StrictInlineContentSecurityPolicy.php',
@@ -765,6 +766,10 @@ class ComposerStaticInit749170dad3f5e7f9ca158f5a9f04f6a2
         'OCP\\OCM\\IOCMProvider' => __DIR__ . '/../../..' . '/lib/public/OCM/IOCMProvider.php',
         'OCP\\OCM\\IOCMResource' => __DIR__ . '/../../..' . '/lib/public/OCM/IOCMResource.php',
         'OCP\\OCS\\IDiscoveryService' => __DIR__ . '/../../..' . '/lib/public/OCS/IDiscoveryService.php',
+        'OCP\\OpenMetrics\\IMetricFamily' => __DIR__ . '/../../..' . '/lib/public/OpenMetrics/IMetricFamily.php',
+        'OCP\\OpenMetrics\\Metric' => __DIR__ . '/../../..' . '/lib/public/OpenMetrics/Metric.php',
+        'OCP\\OpenMetrics\\MetricTypes' => __DIR__ . '/../../..' . '/lib/public/OpenMetrics/MetricTypes.php',
+        'OCP\\OpenMetrics\\MetricValue' => __DIR__ . '/../../..' . '/lib/public/OpenMetrics/MetricValue.php',
         'OCP\\PreConditionNotMetException' => __DIR__ . '/../../..' . '/lib/public/PreConditionNotMetException.php',
         'OCP\\Preview\\BeforePreviewFetchedEvent' => __DIR__ . '/../../..' . '/lib/public/Preview/BeforePreviewFetchedEvent.php',
         'OCP\\Preview\\IMimeIconProvider' => __DIR__ . '/../../..' . '/lib/public/Preview/IMimeIconProvider.php',
@@ -1461,6 +1466,7 @@ class ComposerStaticInit749170dad3f5e7f9ca158f5a9f04f6a2
         'OC\\Core\\Controller\\OCJSController' => __DIR__ . '/../../..' . '/core/Controller/OCJSController.php',
         'OC\\Core\\Controller\\OCMController' => __DIR__ . '/../../..' . '/core/Controller/OCMController.php',
         'OC\\Core\\Controller\\OCSController' => __DIR__ . '/../../..' . '/core/Controller/OCSController.php',
+        'OC\\Core\\Controller\\OpenMetricsController' => __DIR__ . '/../../..' . '/core/Controller/OpenMetricsController.php',
         'OC\\Core\\Controller\\PreviewController' => __DIR__ . '/../../..' . '/core/Controller/PreviewController.php',
         'OC\\Core\\Controller\\ProfileApiController' => __DIR__ . '/../../..' . '/core/Controller/ProfileApiController.php',
         'OC\\Core\\Controller\\RecommendedAppsController' => __DIR__ . '/../../..' . '/core/Controller/RecommendedAppsController.php',
@@ -1934,6 +1940,17 @@ class ComposerStaticInit749170dad3f5e7f9ca158f5a9f04f6a2
         'OC\\OCS\\CoreCapabilities' => __DIR__ . '/../../..' . '/lib/private/OCS/CoreCapabilities.php',
         'OC\\OCS\\DiscoveryService' => __DIR__ . '/../../..' . '/lib/private/OCS/DiscoveryService.php',
         'OC\\OCS\\Provider' => __DIR__ . '/../../..' . '/lib/private/OCS/Provider.php',
+        'OC\\OpenMetrics\\Exporter' => __DIR__ . '/../../..' . '/lib/private/OpenMetrics/Exporter.php',
+        'OC\\OpenMetrics\\Exporters\\ActiveSessions' => __DIR__ . '/../../..' . '/lib/private/OpenMetrics/Exporters/ActiveSessions.php',
+        'OC\\OpenMetrics\\Exporters\\ActiveUsers' => __DIR__ . '/../../..' . '/lib/private/OpenMetrics/Exporters/ActiveUsers.php',
+        'OC\\OpenMetrics\\Exporters\\AppsCount' => __DIR__ . '/../../..' . '/lib/private/OpenMetrics/Exporters/AppsCount.php',
+        'OC\\OpenMetrics\\Exporters\\AppsInfo' => __DIR__ . '/../../..' . '/lib/private/OpenMetrics/Exporters/AppsInfo.php',
+        'OC\\OpenMetrics\\Exporters\\Cached' => __DIR__ . '/../../..' . '/lib/private/OpenMetrics/Exporters/Cached.php',
+        'OC\\OpenMetrics\\Exporters\\FilesByType' => __DIR__ . '/../../..' . '/lib/private/OpenMetrics/Exporters/FilesByType.php',
+        'OC\\OpenMetrics\\Exporters\\InstanceInfo' => __DIR__ . '/../../..' . '/lib/private/OpenMetrics/Exporters/InstanceInfo.php',
+        'OC\\OpenMetrics\\Exporters\\Maintenance' => __DIR__ . '/../../..' . '/lib/private/OpenMetrics/Exporters/Maintenance.php',
+        'OC\\OpenMetrics\\Exporters\\RunningJobs' => __DIR__ . '/../../..' . '/lib/private/OpenMetrics/Exporters/RunningJobs.php',
+        'OC\\OpenMetrics\\Exporters\\UsersByBackend' => __DIR__ . '/../../..' . '/lib/private/OpenMetrics/Exporters/UsersByBackend.php',
         'OC\\PhoneNumberUtil' => __DIR__ . '/../../..' . '/lib/private/PhoneNumberUtil.php',
         'OC\\PreviewManager' => __DIR__ . '/../../..' . '/lib/private/PreviewManager.php',
         'OC\\PreviewNotAvailableException' => __DIR__ . '/../../..' . '/lib/private/PreviewNotAvailableException.php',
diff --git a/lib/private/OpenMetrics/Exporter.php b/lib/private/OpenMetrics/Exporter.php
new file mode 100644
index 0000000000000..aba387d1b5223
--- /dev/null
+++ b/lib/private/OpenMetrics/Exporter.php
@@ -0,0 +1,97 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2025 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace OC\OpenMetrics;
+
+use Generator;
+use OC\Log\PsrLoggerAdapter;
+use OCP\App\IAppManager;
+use OCP\IConfig;
+use OCP\OpenMetrics\IMetricFamily;
+use OCP\Server;
+
+/**
+ * @since 33.0.0
+ */
+class Exporter {
+	private array $skippedClasses;
+	private const XML_ENTRY = 'openmetrics';
+
+	public function __construct(
+		private IAppManager $appManager,
+		private PsrLoggerAdapter $logger,
+		IConfig $config,
+	) {
+		// Use values as keys for faster lookups
+		$this->skippedClasses = array_fill_keys($config->getSystemValue('openmetrics_skipped_classes', []), true);
+	}
+
+	public function __invoke(): Generator {
+		// Core exporters
+		$exporters = [
+			// Basic exporters
+			Exporters\InstanceInfo::class,
+			Exporters\AppsInfo::class,
+			Exporters\AppsCount::class,
+			Exporters\Maintenance::class,
+
+			// File exporters
+			Exporters\FilesByType::class,
+
+			// Users exporters
+			Exporters\ActiveUsers::class,
+			Exporters\ActiveSessions::class,
+			Exporters\UsersByBackend::class,
+
+			// Jobs
+			Exporters\RunningJobs::class,
+		];
+		$exporters = array_filter($exporters, fn ($classname) => !isset($this->skippedClasses[$classname]));
+		foreach ($exporters as $classname) {
+			$exporter = $this->loadExporter($classname);
+			if ($exporter !== null) {
+				yield $exporter;
+			}
+		}
+
+		// Apps exporters
+		foreach ($this->appManager->getEnabledApps() as $appName) {
+			$appInfo = $this->appManager->getAppInfo($appName);
+			if (!isset($appInfo[self::XML_ENTRY]) || !is_array($appInfo[self::XML_ENTRY])) {
+				continue;
+			}
+			foreach ($appInfo[self::XML_ENTRY] as $classname) {
+				if (isset($this->skippedClasses[$classname])) {
+					continue;
+				}
+				$exporter = $this->loadExporter($classname, $appName);
+				if ($exporter !== null) {
+					yield $exporter;
+				}
+			}
+		}
+	}
+
+	private function loadExporter(string $classname, string $appName = 'core'): ?IMetricFamily {
+		try {
+			return Server::get($classname);
+		} catch (\Exception $e) {
+			$this->logger->error(
+				'Unable to build exporter {exporter}',
+				[
+					'app' => $appName,
+					'exception' => $e,
+					'exporter' => $classname,
+				],
+			);
+		}
+
+		return null;
+	}
+}
diff --git a/lib/private/OpenMetrics/Exporters/ActiveSessions.php b/lib/private/OpenMetrics/Exporters/ActiveSessions.php
new file mode 100644
index 0000000000000..50013ae970b30
--- /dev/null
+++ b/lib/private/OpenMetrics/Exporters/ActiveSessions.php
@@ -0,0 +1,61 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2025 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace OC\OpenMetrics\Exporters;
+
+use Generator;
+use OCP\IDBConnection;
+use OCP\OpenMetrics\IMetricFamily;
+use OCP\OpenMetrics\Metric;
+use OCP\OpenMetrics\MetricTypes;
+
+/**
+ * @since 33.0.0
+ */
+class ActiveSessions implements IMetricFamily {
+	public function __construct(
+		private IDBConnection $connection,
+	) {
+	}
+
+	public function name(): string {
+		return 'active_sessions';
+	}
+
+	public function type(): MetricTypes {
+		return MetricTypes::gauge;
+	}
+
+	public function unit(): string {
+		return 'sessions';
+	}
+
+	public function help(): string {
+		return 'Number of active sessions';
+	}
+
+	public function metrics(): Generator {
+		$now = time();
+		$timeFrames = [
+			'Last 5 minutes' => $now - 5 * 60,
+			'Last 15 minutes' => $now - 15 * 60,
+			'Last hour' => $now - 60 * 60,
+			'Last day' => $now - 24 * 60 * 60,
+		];
+		foreach ($timeFrames as $label => $time) {
+			$queryBuilder = $this->connection->getQueryBuilder();
+			$result = $queryBuilder->select($queryBuilder->func()->count('*'))
+				->from('authtoken')
+				->where($queryBuilder->expr()->gte('last_activity', $queryBuilder->createNamedParameter($time)))
+				->executeQuery();
+
+			yield new Metric((int)$result->fetchOne(), ['time' => $label]);
+		}
+	}
+}
diff --git a/lib/private/OpenMetrics/Exporters/ActiveUsers.php b/lib/private/OpenMetrics/Exporters/ActiveUsers.php
new file mode 100644
index 0000000000000..1b5267254d741
--- /dev/null
+++ b/lib/private/OpenMetrics/Exporters/ActiveUsers.php
@@ -0,0 +1,61 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2025 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace OC\OpenMetrics\Exporters;
+
+use Generator;
+use OCP\IDBConnection;
+use OCP\OpenMetrics\IMetricFamily;
+use OCP\OpenMetrics\Metric;
+use OCP\OpenMetrics\MetricTypes;
+
+/**
+ * @since 33.0.0
+ */
+class ActiveUsers implements IMetricFamily {
+	public function __construct(
+		private IDBConnection $connection,
+	) {
+	}
+
+	public function name(): string {
+		return 'active_users';
+	}
+
+	public function type(): MetricTypes {
+		return MetricTypes::gauge;
+	}
+
+	public function unit(): string {
+		return 'users';
+	}
+
+	public function help(): string {
+		return 'Number of active users';
+	}
+
+	public function metrics(): Generator {
+		$now = time();
+		$timeFrames = [
+			'Last 5 minutes' => $now - 5 * 60,
+			'Last 15 minutes' => $now - 15 * 60,
+			'Last hour' => $now - 60 * 60,
+			'Last day' => $now - 24 * 60 * 60,
+		];
+		foreach ($timeFrames as $label => $time) {
+			$qb = $this->connection->getQueryBuilder();
+			$result = $qb->select($qb->createFunction('COUNT(DISTINCT ' . $qb->getColumnName('uid') . ')'))
+				->from('authtoken')
+				->where($qb->expr()->gte('last_activity', $qb->createNamedParameter($time)))
+				->executeQuery();
+
+			yield new Metric((int)$result->fetchOne(), ['time' => $label]);
+		}
+	}
+}
diff --git a/lib/private/OpenMetrics/Exporters/AppsCount.php b/lib/private/OpenMetrics/Exporters/AppsCount.php
new file mode 100644
index 0000000000000..ee038635fb331
--- /dev/null
+++ b/lib/private/OpenMetrics/Exporters/AppsCount.php
@@ -0,0 +1,64 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2025 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace OC\OpenMetrics\Exporters;
+
+use Generator;
+use OCP\App\IAppManager;
+use OCP\OpenMetrics\IMetricFamily;
+use OCP\OpenMetrics\Metric;
+use OCP\OpenMetrics\MetricTypes;
+use Override;
+
+/**
+ * Export statistics about apps
+ *
+ * @since 33.0.0
+ */
+class AppsCount implements IMetricFamily {
+	public function __construct(
+		private IAppManager $appManager,
+	) {
+	}
+
+	#[Override]
+	public function name(): string {
+		return 'apps_count';
+	}
+
+	#[Override]
+	public function type(): MetricTypes {
+		return MetricTypes::gauge;
+	}
+
+	#[Override]
+	public function unit(): string {
+		return 'applications';
+	}
+
+	#[Override]
+	public function help(): string {
+		return 'Applications in Nextcloud';
+	}
+
+	#[Override]
+	public function metrics(): Generator {
+		$installedAppsCount = count($this->appManager->getAppInstalledVersions(false));
+		$enabledAppsCount = count($this->appManager->getEnabledApps());
+		$disabledAppsCount = $installedAppsCount - $enabledAppsCount;
+		yield new Metric(
+			$disabledAppsCount,
+			['status' => 'disabled'],
+		);
+		yield new Metric(
+			$enabledAppsCount,
+			['status' => 'enabled'],
+		);
+	}
+}
diff --git a/lib/private/OpenMetrics/Exporters/AppsInfo.php b/lib/private/OpenMetrics/Exporters/AppsInfo.php
new file mode 100644
index 0000000000000..0adb53a92e360
--- /dev/null
+++ b/lib/private/OpenMetrics/Exporters/AppsInfo.php
@@ -0,0 +1,58 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2025 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace OC\OpenMetrics\Exporters;
+
+use Generator;
+use OCP\App\IAppManager;
+use OCP\OpenMetrics\IMetricFamily;
+use OCP\OpenMetrics\Metric;
+use OCP\OpenMetrics\MetricTypes;
+use Override;
+
+/**
+ * Export information about enabled applications
+ *
+ * @since 33.0.0
+ */
+class AppsInfo implements IMetricFamily {
+	public function __construct(
+		private IAppManager $appManager,
+	) {
+	}
+
+	#[Override]
+	public function name(): string {
+		return 'apps_info';
+	}
+
+	#[Override]
+	public function type(): MetricTypes {
+		return MetricTypes::info;
+	}
+
+	#[Override]
+	public function unit(): string {
+		return '';
+	}
+
+	#[Override]
+	public function help(): string {
+		return 'Enabled applications in Nextcloud';
+	}
+
+	#[Override]
+	public function metrics(): Generator {
+		yield new Metric(
+			1,
+			$this->appManager->getAppInstalledVersions(true),
+			time()
+		);
+	}
+}
diff --git a/lib/private/OpenMetrics/Exporters/Cached.php b/lib/private/OpenMetrics/Exporters/Cached.php
new file mode 100644
index 0000000000000..298eedebba855
--- /dev/null
+++ b/lib/private/OpenMetrics/Exporters/Cached.php
@@ -0,0 +1,60 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2025 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace OC\OpenMetrics\Exporters;
+
+use Generator;
+use OCP\ICache;
+use OCP\ICacheFactory;
+use OCP\OpenMetrics\IMetricFamily;
+use Override;
+
+/**
+ * Cached metrics
+ *
+ * @since 33.0.0
+ */
+abstract class Cached implements IMetricFamily {
+	private readonly ICache $cache;
+
+	public function __construct(
+		ICacheFactory $cacheFactory,
+	) {
+		$this->cache = $cacheFactory->createDistributed('openmetrics');
+	}
+
+	/**
+	 * Number of seconds to keep the results
+	 */
+	abstract public function getTTL(): int;
+
+	/**
+	 * Actually gather the metrics
+	 *
+	 * @see metrics
+	 */
+	abstract public function gatherMetrics(): Generator;
+
+	#[Override]
+	public function metrics(): Generator {
+		$cacheKey = get_called_class();
+		if ($data = $this->cache->get($cacheKey)) {
+			yield from unserialize($data);
+			return;
+		}
+
+		$data = [];
+		foreach ($this->gatherMetrics() as $metric) {
+			yield $metric;
+			$data[] = $metric;
+		}
+
+		$this->cache->set($cacheKey, serialize($data), $this->getTTL());
+	}
+}
diff --git a/lib/private/OpenMetrics/Exporters/FilesByType.php b/lib/private/OpenMetrics/Exporters/FilesByType.php
new file mode 100644
index 0000000000000..d2d9e3ceb2bef
--- /dev/null
+++ b/lib/private/OpenMetrics/Exporters/FilesByType.php
@@ -0,0 +1,77 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2025 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace OC\OpenMetrics\Exporters;
+
+use Generator;
+use OCP\ICacheFactory;
+use OCP\IDBConnection;
+use OCP\OpenMetrics\Metric;
+use OCP\OpenMetrics\MetricTypes;
+use Override;
+
+/**
+ * Export files count
+ *
+ * Cached exporter, refreshed every 30 minutes
+ *
+ * @since 33.0.0
+ */
+class FilesByType extends Cached {
+	public function __construct(
+		ICacheFactory $cacheFactory,
+		private IDBConnection $connection,
+	) {
+		parent::__construct($cacheFactory);
+	}
+
+	#[Override]
+	public function name(): string {
+		return 'files';
+	}
+
+	#[Override]
+	public function type(): MetricTypes {
+		return MetricTypes::gauge;
+	}
+
+	#[Override]
+	public function unit(): string {
+		return 'files';
+	}
+
+	#[Override]
+	public function help(): string {
+		return 'Number of files by type';
+	}
+
+	#[Override]
+	public function getTTL(): int {
+		return 30 * 60;
+	}
+
+	#[Override]
+	public function gatherMetrics(): Generator {
+		$qb = $this->connection->getQueryBuilder();
+		$metrics = $qb->select('M.mimetype', $qb->func()->count('*', 'count'))
+			->from('filecache', 'F')
+			->join('F', 'mimetypes', 'M', $qb->expr()->eq('F.mimetype', 'M.id'))
+			->groupBy('M.mimetype')
+			->executeQuery();
+
+		if ($metrics->rowCount() === 0) {
+			yield new Metric(0);
+			return;
+		}
+		$now = time();
+		while ($count = $metrics->fetch()) {
+			yield new Metric($count['count'], ['mimetype' => $count['mimetype']], $now);
+		}
+	}
+}
diff --git a/lib/private/OpenMetrics/Exporters/InstanceInfo.php b/lib/private/OpenMetrics/Exporters/InstanceInfo.php
new file mode 100644
index 0000000000000..4c1e1507ba83f
--- /dev/null
+++ b/lib/private/OpenMetrics/Exporters/InstanceInfo.php
@@ -0,0 +1,64 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2025 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace OC\OpenMetrics\Exporters;
+
+use Generator;
+use OC\SystemConfig;
+use OCP\OpenMetrics\IMetricFamily;
+use OCP\OpenMetrics\Metric;
+use OCP\OpenMetrics\MetricTypes;
+use OCP\ServerVersion;
+use Override;
+
+/**
+ * Export some basic information about current instance
+ * @since 33.0.0
+ */
+class InstanceInfo implements IMetricFamily {
+	public function __construct(
+		private SystemConfig $systemConfig,
+		private ServerVersion $serverVersion,
+	) {
+	}
+
+	#[Override]
+	public function name(): string {
+		return 'instance_info';
+	}
+
+	#[Override]
+	public function type(): MetricTypes {
+		return MetricTypes::info;
+	}
+
+	#[Override]
+	public function unit(): string {
+		return '';
+	}
+
+	#[Override]
+	public function help(): string {
+		return 'Basic information about Nextcloud';
+	}
+
+	#[Override]
+	public function metrics(): Generator {
+		yield new Metric(
+			1,
+			[
+				'full version' => $this->serverVersion->getHumanVersion(),
+				'major version' => (string)$this->serverVersion->getVersion()[0],
+				'build' => $this->serverVersion->getBuild(),
+				'installed' => $this->systemConfig->getValue('installed', false) ? '1' : '0',
+			],
+			time()
+		);
+	}
+}
diff --git a/lib/private/OpenMetrics/Exporters/Maintenance.php b/lib/private/OpenMetrics/Exporters/Maintenance.php
new file mode 100644
index 0000000000000..f74b8b391599d
--- /dev/null
+++ b/lib/private/OpenMetrics/Exporters/Maintenance.php
@@ -0,0 +1,52 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2025 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace OC\OpenMetrics\Exporters;
+
+use Generator;
+use OC\SystemConfig;
+use OCP\OpenMetrics\IMetricFamily;
+use OCP\OpenMetrics\Metric;
+use OCP\OpenMetrics\MetricTypes;
+use OCP\Server;
+use Override;
+
+/**
+ * Export maintenance state
+ *
+ * @since 33.0.0
+ */
+class Maintenance implements IMetricFamily {
+	public function name(): string {
+		return 'maintenance';
+	}
+
+	#[Override]
+	public function type(): MetricTypes {
+		return MetricTypes::info;
+	}
+
+	#[Override]
+	public function unit(): string {
+		return '';
+	}
+
+	#[Override]
+	public function help(): string {
+		return 'Maintenance status of Nextcloud';
+	}
+
+	#[Override]
+	public function metrics(): Generator {
+		$systemConfig = Server::get(SystemConfig::class);
+		yield new Metric(
+			(bool)$systemConfig->getValue('maintenance', false)
+		);
+	}
+}
diff --git a/lib/private/OpenMetrics/Exporters/RunningJobs.php b/lib/private/OpenMetrics/Exporters/RunningJobs.php
new file mode 100644
index 0000000000000..ac8abefa1a425
--- /dev/null
+++ b/lib/private/OpenMetrics/Exporters/RunningJobs.php
@@ -0,0 +1,69 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2025 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace OC\OpenMetrics\Exporters;
+
+use Generator;
+use OCP\IDBConnection;
+use OCP\OpenMetrics\IMetricFamily;
+use OCP\OpenMetrics\Metric;
+use OCP\OpenMetrics\MetricTypes;
+use Override;
+
+/**
+ * Export the number of running jobs by type
+ *
+ * @since 33.0.0
+ */
+class RunningJobs implements IMetricFamily {
+	public function __construct(
+		private IDBConnection $connection,
+	) {
+	}
+
+	#[Override]
+	public function name(): string {
+		return 'jobs_running';
+	}
+
+	#[Override]
+	public function type(): MetricTypes {
+		return MetricTypes::gauge;
+	}
+
+	#[Override]
+	public function unit(): string {
+		return 'jobs';
+	}
+
+	#[Override]
+	public function help(): string {
+		return 'Number of running jobs';
+	}
+
+	#[Override]
+	public function metrics(): Generator {
+		$qb = $this->connection->getQueryBuilder();
+		$result = $qb->select($qb->func()->count('*', 'nb'), 'class')
+			->from('jobs')
+			->where($qb->expr()->gt('reserved_at', $qb->createNamedParameter(0)))
+			->groupBy('class')
+			->executeQuery();
+
+		// If no result, return a metric with count '0'
+		if ($result->rowCount() === 0) {
+			yield new Metric(0);
+			return;
+		}
+
+		while ($row = $result->fetch()) {
+			yield new Metric($row['nb'], ['class' => $row['class']]);
+		}
+	}
+}
diff --git a/lib/private/OpenMetrics/Exporters/UsersByBackend.php b/lib/private/OpenMetrics/Exporters/UsersByBackend.php
new file mode 100644
index 0000000000000..937e23b242a8b
--- /dev/null
+++ b/lib/private/OpenMetrics/Exporters/UsersByBackend.php
@@ -0,0 +1,57 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2025 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace OC\OpenMetrics\Exporters;
+
+use Generator;
+use OCP\IUserManager;
+use OCP\OpenMetrics\IMetricFamily;
+use OCP\OpenMetrics\Metric;
+use OCP\OpenMetrics\MetricTypes;
+use Override;
+
+/**
+ * Count users of each backend which supports it (mapped users only)
+ *
+ * @since 33.0.0
+ */
+class UsersByBackend implements IMetricFamily {
+	public function __construct(
+		private IUserManager $userManager,
+	) {
+	}
+
+	#[Override]
+	public function name(): string {
+		return 'users';
+	}
+
+	#[Override]
+	public function type(): MetricTypes {
+		return MetricTypes::gauge;
+	}
+
+	#[Override]
+	public function unit(): string {
+		return 'users';
+	}
+
+	#[Override]
+	public function help(): string {
+		return 'Number of users by backend';
+	}
+
+	#[Override]
+	public function metrics(): Generator {
+		$userCounts = $this->userManager->countUsers(true);
+		foreach ($userCounts as $backend => $count) {
+			yield new Metric($count, ['backend' => $backend]);
+		}
+	}
+}
diff --git a/lib/private/User/Manager.php b/lib/private/User/Manager.php
index 4a42a397a8e47..2bea9bb65dd74 100644
--- a/lib/private/User/Manager.php
+++ b/lib/private/User/Manager.php
@@ -443,22 +443,23 @@ public function createUserFromBackend($uid, $password, UserInterface $backend) {
 	/**
 	 * returns how many users per backend exist (if supported by backend)
 	 *
-	 * @param boolean $hasLoggedIn when true only users that have a lastLogin
-	 *                             entry in the preferences table will be affected
 	 * @return array<string, int> an array of backend class as key and count number as value
 	 */
-	public function countUsers() {
+	public function countUsers(bool $onlyMappedUsers = false) {
 		$userCountStatistics = [];
 		foreach ($this->backends as $backend) {
+			$name = $backend instanceof IUserBackend
+				? $backend->getBackendName()
+				: get_class($backend);
+
+			if ($onlyMappedUsers && $backend instanceof ICountMappedUsersBackend) {
+				$userCountStatistics[$name] = $backend->countMappedUsers();
+				continue;
+			}
 			if ($backend instanceof ICountUsersBackend || $backend->implementsActions(Backend::COUNT_USERS)) {
 				/** @var ICountUsersBackend|IUserBackend $backend */
 				$backendUsers = $backend->countUsers();
 				if ($backendUsers !== false) {
-					if ($backend instanceof IUserBackend) {
-						$name = $backend->getBackendName();
-					} else {
-						$name = get_class($backend);
-					}
 					if (isset($userCountStatistics[$name])) {
 						$userCountStatistics[$name] += $backendUsers;
 					} else {
@@ -467,6 +468,7 @@ public function countUsers() {
 				}
 			}
 		}
+
 		return $userCountStatistics;
 	}
 
diff --git a/lib/public/AppFramework/Http/StreamTraversableResponse.php b/lib/public/AppFramework/Http/StreamTraversableResponse.php
new file mode 100644
index 0000000000000..aecf57c80596f
--- /dev/null
+++ b/lib/public/AppFramework/Http/StreamTraversableResponse.php
@@ -0,0 +1,51 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2025 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+namespace OCP\AppFramework\Http;
+
+use OCP\AppFramework\Http;
+use Override;
+use Traversable;
+
+/**
+ * Class StreamResponse
+ *
+ * @since 33.0.0
+ * @template S of Http::STATUS_*
+ * @template H of array<string, mixed>
+ * @template-extends Response<Http::STATUS_*, array<string, mixed>>
+ */
+class StreamTraversableResponse extends Response implements ICallbackResponse {
+	/**
+	 * @param S $status
+	 * @param H $headers
+	 * @since 33.0.0
+	 */
+	public function __construct(
+		private Traversable $generator,
+		int $status = Http::STATUS_OK,
+		array $headers = [],
+	) {
+		parent::__construct($status, $headers);
+	}
+
+
+	/**
+	 * Streams the generator output
+	 *
+	 * @param IOutput $output a small wrapper that handles output
+	 * @since 33.0.0
+	 */
+	#[Override]
+	public function callback(IOutput $output): void {
+		foreach ($this->generator as $content) {
+			$output->setOutput($content);
+			flush();
+		}
+	}
+}
diff --git a/lib/public/IUserManager.php b/lib/public/IUserManager.php
index 226a52809a3d0..caf1a704cce99 100644
--- a/lib/public/IUserManager.php
+++ b/lib/public/IUserManager.php
@@ -162,8 +162,9 @@ public function createUserFromBackend($uid, $password, UserInterface $backend);
 	 *
 	 * @return array<string, int> an array of backend class name as key and count number as value
 	 * @since 8.0.0
+	 * @since 33.0.0 $onlyMappedUsers parameter
 	 */
-	public function countUsers();
+	public function countUsers(bool $onlyMappedUsers = false);
 
 	/**
 	 * Get how many users exists in total, whithin limit
diff --git a/lib/public/OpenMetrics/IMetricFamily.php b/lib/public/OpenMetrics/IMetricFamily.php
new file mode 100644
index 0000000000000..21b54496ecbcb
--- /dev/null
+++ b/lib/public/OpenMetrics/IMetricFamily.php
@@ -0,0 +1,53 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2025 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace OCP\OpenMetrics;
+
+use Generator;
+use OCP\AppFramework\Attribute\Implementable;
+
+/**
+ * @since 33.0.0
+ */
+#[Implementable(since: '33.0.0')]
+interface IMetricFamily {
+	/**
+	 * Family name (will be prefixed by nextcloud_)
+	 *
+	 * @since 33.0.0
+	 */
+	public function name(): string;
+
+	/**
+	 * Family metric type
+	 *
+	 * @since 33.0.0
+	 */
+	public function type(): MetricTypes;
+
+	/**
+	 * Family unit (can be empty string)
+	 * @since 33.0.0
+	 */
+	public function unit(): string;
+
+	/**
+	 * Family help text (can be empty string)
+	 * @since 33.0.0
+	 */
+	public function help(): string;
+
+	/**
+	 * List of metrics
+	 *
+	 * @return Generator<Metric>
+	 * @since 33.0.0
+	 */
+	public function metrics(): Generator;
+}
diff --git a/lib/public/OpenMetrics/Metric.php b/lib/public/OpenMetrics/Metric.php
new file mode 100644
index 0000000000000..47e925b01b75f
--- /dev/null
+++ b/lib/public/OpenMetrics/Metric.php
@@ -0,0 +1,27 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2025 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace OCP\OpenMetrics;
+
+/**
+ * @since 33.0.0
+ */
+final readonly class Metric {
+	public function __construct(
+		public int|float|bool|MetricValue $value = false,
+		/** @var string[] */
+		public array $labels = [],
+		public int|float|null $timestamp = null,
+	) {
+	}
+
+	public function label(string $name): ?string {
+		return $this->labels[$name] ?? null;
+	}
+}
diff --git a/lib/public/OpenMetrics/MetricTypes.php b/lib/public/OpenMetrics/MetricTypes.php
new file mode 100644
index 0000000000000..54343aa65c9cc
--- /dev/null
+++ b/lib/public/OpenMetrics/MetricTypes.php
@@ -0,0 +1,26 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2025 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace OCP\OpenMetrics;
+
+/**
+ * Metrics types
+ *
+ * @since 33.0.0
+ */
+enum MetricTypes {
+	case counter;
+	case gauge;
+	case histogram;
+	case gaugehistogram;
+	case stateset;
+	case info;
+	case summary;
+	case unknown;
+}
diff --git a/lib/public/OpenMetrics/MetricValue.php b/lib/public/OpenMetrics/MetricValue.php
new file mode 100644
index 0000000000000..34922947d254d
--- /dev/null
+++ b/lib/public/OpenMetrics/MetricValue.php
@@ -0,0 +1,20 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2025 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace OCP\OpenMetrics;
+
+/**
+ * Special values for metrics
+ * @since 33.0.0
+ */
+enum MetricValue: string {
+	case NOT_A_NUMBER = 'NaN';
+	case POSITIVE_INFINITY = '+Inf';
+	case NEGATIVE_INFINITY = '-Inf';
+}
diff --git a/openapi.json b/openapi.json
index 7aff72d29a187..e1d0a6ef5f8d8 100644
--- a/openapi.json
+++ b/openapi.json
@@ -33,6 +33,10 @@
             "name": "core/ocm",
             "description": "Controller about the endpoint /ocm-provider/"
         },
+        {
+            "name": "core/open_metrics",
+            "description": "OpenMetrics controller Gather and display metrics"
+        },
         {
             "name": "cloud_federation_api/request_handler",
             "description": "Open-Cloud-Mesh-API"
diff --git a/tests/Core/Controller/OpenMetricsControllerTest.php b/tests/Core/Controller/OpenMetricsControllerTest.php
new file mode 100644
index 0000000000000..6e529ac90f834
--- /dev/null
+++ b/tests/Core/Controller/OpenMetricsControllerTest.php
@@ -0,0 +1,78 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2025 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace Tests\Core\Controller;
+
+use OC\Core\Controller\OpenMetricsController;
+use OC\OpenMetrics\Exporter;
+use OCP\AppFramework\Http\IOutput;
+use OCP\AppFramework\Http\Response;
+use OCP\AppFramework\Http\StreamTraversableResponse;
+use OCP\IConfig;
+use OCP\IRequest;
+use PHPUnit\Framework\MockObject\MockObject;
+use Psr\Log\LoggerInterface;
+use Test\TestCase;
+
+class OpenMetricsControllerTest extends TestCase {
+	private IRequest&MockObject $request;
+	private IConfig&MockObject $config;
+	private Exporter&MockObject $exporter;
+	private LoggerInterface&MockObject $logger;
+	private OpenMetricsController $controller;
+
+	protected function setUp(): void {
+		parent::setUp();
+		$this->request = $this->createMock(IRequest::class);
+		$this->request->method('getRemoteAddress')
+			->willReturn('192.168.1.1');
+		$this->config = $this->createMock(IConfig::class);
+		$this->exporter = $this->createMock(Exporter::class);
+		$this->logger = $this->createMock(LoggerInterface::class);
+		$this->controller = new OpenMetricsController('core', $this->request, $this->config, $this->exporter, $this->logger);
+	}
+
+	public function testGetMetrics(): void {
+		$output = $this->createMock(IOutput::class);
+		$fullOutput = '';
+		$output->method('setOutput')
+			->willReturnCallback(function ($output) use (&$fullOutput) {
+				$fullOutput .= $output;
+			});
+		$this->config->expects($this->once())
+			->method('getSystemValue')
+			->with('openmetrics_allowed_clients')
+			->willReturn(['192.168.0.0/16']);
+		$response = $this->controller->export();
+		$this->assertInstanceOf(StreamTraversableResponse::class, $response);
+		$this->assertEquals('200', $response->getStatus());
+		$this->assertEquals('application/openmetrics-text; version=1.0.0; charset=utf-8', $response->getHeaders()['Content-Type']);
+		$expected = <<<EXPECTED
+			# TYPE nextcloud_exporter_duration gauge
+			# UNIT nextcloud_exporter_duration seconds
+			# HELP nextcloud_exporter_duration Exporter run time
+			nextcloud_exporter_duration %f
+
+			# EOF
+
+			EXPECTED;
+		$response->callback($output);
+		$this->assertStringMatchesFormat($expected, $fullOutput);
+	}
+
+	public function testGetMetricsFromForbiddenIp(): void {
+		$this->config->expects($this->once())
+			->method('getSystemValue')
+			->with('openmetrics_allowed_clients')
+			->willReturn(['1.2.3.4']);
+		$response = $this->controller->export();
+		$this->assertInstanceOf(Response::class, $response);
+		$this->assertEquals('403', $response->getStatus());
+	}
+}
diff --git a/tests/lib/InfoXmlTest.php b/tests/lib/InfoXmlTest.php
index 9506f87c1b0a0..4e2620439d23c 100644
--- a/tests/lib/InfoXmlTest.php
+++ b/tests/lib/InfoXmlTest.php
@@ -9,6 +9,7 @@
 
 use OCP\App\IAppManager;
 use OCP\AppFramework\App;
+use OCP\OpenMetrics\IMetricFamily;
 use OCP\Server;
 
 /**
@@ -130,5 +131,14 @@ public function testClasses($app): void {
 				$this->assertInstanceOf($command, Server::get($command));
 			}
 		}
+
+		if (isset($appInfo['openmetrics'])) {
+			foreach ($appInfo['openmetrics'] as $class) {
+				$this->assertTrue(class_exists($class), 'Asserting exporter "' . $class . '"exists');
+				$exporter = Server::get($class);
+				$this->assertInstanceOf($class, $exporter);
+				$this->assertInstanceOf(IMetricFamily::class, $exporter);
+			}
+		}
 	}
 }
diff --git a/tests/lib/OpenMetrics/ExporterTest.php b/tests/lib/OpenMetrics/ExporterTest.php
new file mode 100644
index 0000000000000..30d717dce8afb
--- /dev/null
+++ b/tests/lib/OpenMetrics/ExporterTest.php
@@ -0,0 +1,23 @@
+<?php
+
+/**
+ * SPDX-FileCopyrightText: 2025 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace Test\OpenMetrics;
+
+use OC\OpenMetrics\Exporter;
+use OCP\OpenMetrics\IMetricFamily;
+use OCP\Server;
+use Test\TestCase;
+
+class ExporterTest extends TestCase {
+	public function testExport(): void {
+		$exporter = Server::get(Exporter::class);
+		$this->assertInstanceOf(Exporter::class, $exporter);
+		foreach ($exporter() as $metric) {
+			$this->assertInstanceOf(IMetricFamily::class, $metric);
+		};
+	}
+}
diff --git a/tests/lib/OpenMetrics/Exporters/ActiveSessionsTest.php b/tests/lib/OpenMetrics/Exporters/ActiveSessionsTest.php
new file mode 100644
index 0000000000000..ebbe3b061d3cc
--- /dev/null
+++ b/tests/lib/OpenMetrics/Exporters/ActiveSessionsTest.php
@@ -0,0 +1,32 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2025 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace Test\OpenMetrics\Exporters;
+
+use OC\OpenMetrics\Exporters\ActiveSessions;
+use OCP\IDBConnection;
+use OCP\OpenMetrics\IMetricFamily;
+use OCP\Server;
+use PHPUnit\Framework\Attributes\Group;
+
+#[Group('DB')]
+class ActiveSessionsTest extends ExporterTestCase {
+	protected function getExporter():IMetricFamily {
+		return new ActiveSessions(Server::get(IDBConnection::class));
+	}
+
+	public function testMetricsLabel(): void {
+		$this->assertLabelsAre([
+			['time' => 'Last 5 minutes'],
+			['time' => 'Last 15 minutes'],
+			['time' => 'Last hour'],
+			['time' => 'Last day'],
+		]);
+	}
+}
diff --git a/tests/lib/OpenMetrics/Exporters/ActiveUsersTest.php b/tests/lib/OpenMetrics/Exporters/ActiveUsersTest.php
new file mode 100644
index 0000000000000..1a41ee2a43b0b
--- /dev/null
+++ b/tests/lib/OpenMetrics/Exporters/ActiveUsersTest.php
@@ -0,0 +1,32 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2025 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace Test\OpenMetrics\Exporters;
+
+use OC\OpenMetrics\Exporters\ActiveUsers;
+use OCP\IDBConnection;
+use OCP\OpenMetrics\IMetricFamily;
+use OCP\Server;
+use PHPUnit\Framework\Attributes\Group;
+
+#[Group('DB')]
+class ActiveUsersTest extends ExporterTestCase {
+	protected function getExporter():IMetricFamily {
+		return new ActiveUsers(Server::get(IDBConnection::class));
+	}
+
+	public function testMetricsLabel(): void {
+		$this->assertLabelsAre([
+			['time' => 'Last 5 minutes'],
+			['time' => 'Last 15 minutes'],
+			['time' => 'Last hour'],
+			['time' => 'Last day'],
+		]);
+	}
+}
diff --git a/tests/lib/OpenMetrics/Exporters/AppsCountTest.php b/tests/lib/OpenMetrics/Exporters/AppsCountTest.php
new file mode 100644
index 0000000000000..c1617e1ba1db4
--- /dev/null
+++ b/tests/lib/OpenMetrics/Exporters/AppsCountTest.php
@@ -0,0 +1,38 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2025 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace Test\OpenMetrics\Exporters;
+
+use OC\OpenMetrics\Exporters\AppsCount;
+use OCP\App\IAppManager;
+use OCP\OpenMetrics\IMetricFamily;
+
+class AppsCountTest extends ExporterTestCase {
+	private IAppManager $appManager;
+
+	protected function getExporter():IMetricFamily {
+		$this->appManager = $this->createMock(IAppManager::class);
+		$this->appManager->method('getAppInstalledVersions')
+			->with(false)
+			->willReturn(['app1', 'app2', 'app3',  'app4',  'app5']);
+		$this->appManager->method('getEnabledApps')
+			->willReturn(['app1', 'app2', 'app3']);
+		return new AppsCount($this->appManager);
+	}
+
+	public function testMetrics(): void {
+		foreach ($this->metrics as $metric) {
+			$expectedValue = match ($metric->label('status')) {
+				'disabled' => 2,
+				'enabled' => 3,
+			};
+			$this->assertEquals($expectedValue, $metric->value);
+		}
+	}
+}
diff --git a/tests/lib/OpenMetrics/Exporters/AppsInfoTest.php b/tests/lib/OpenMetrics/Exporters/AppsInfoTest.php
new file mode 100644
index 0000000000000..5baa85af3f9f3
--- /dev/null
+++ b/tests/lib/OpenMetrics/Exporters/AppsInfoTest.php
@@ -0,0 +1,37 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2025 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace Test\OpenMetrics\Exporters;
+
+use OC\OpenMetrics\Exporters\AppsInfo;
+use OCP\App\IAppManager;
+use OCP\OpenMetrics\IMetricFamily;
+
+class AppsInfoTest extends ExporterTestCase {
+	private IAppManager $appManager;
+	private array $appList = [
+		'appA' => '0.1.2',
+		'appB' => '1.2.3 beta 4',
+	];
+
+	protected function getExporter():IMetricFamily {
+		$this->appManager = $this->createMock(IAppManager::class);
+		$this->appManager->method('getAppInstalledVersions')
+			->with(true)
+			->willReturn($this->appList);
+
+		return new AppsInfo($this->appManager);
+	}
+
+	public function testMetrics(): void {
+		$this->assertCount(1, $this->metrics);
+		$metric = array_pop($this->metrics);
+		$this->assertSame($this->appList, $metric->labels);
+	}
+}
diff --git a/tests/lib/OpenMetrics/Exporters/ExporterTestCase.php b/tests/lib/OpenMetrics/Exporters/ExporterTestCase.php
new file mode 100644
index 0000000000000..cf7ffbdab1815
--- /dev/null
+++ b/tests/lib/OpenMetrics/Exporters/ExporterTestCase.php
@@ -0,0 +1,41 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2025 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace Test\OpenMetrics\Exporters;
+
+use OCP\OpenMetrics\IMetricFamily;
+use Test\TestCase;
+
+abstract class ExporterTestCase extends TestCase {
+	protected IMetricFamily $exporter;
+	/** @var IMetric[] */
+	protected array $metrics;
+
+	abstract protected function getExporter(): IMetricFamily;
+
+	protected function setUp(): void {
+		parent::setUp();
+		$this->exporter = $this->getExporter();
+		$this->metrics = iterator_to_array($this->exporter->metrics());
+	}
+
+	public function testNotEmptyData() {
+		$this->assertNotEmpty($this->exporter->name());
+		$this->assertNotEmpty($this->metrics);
+	}
+
+	protected function assertLabelsAre(array $expectedLabels) {
+		$foundLabels = [];
+		foreach ($this->metrics as $metric) {
+			$foundLabels[] = $metric->labels;
+		}
+
+		$this->assertSame($foundLabels, $expectedLabels);
+	}
+}
diff --git a/tests/lib/OpenMetrics/Exporters/FilesByTypeTest.php b/tests/lib/OpenMetrics/Exporters/FilesByTypeTest.php
new file mode 100644
index 0000000000000..a87e42864808f
--- /dev/null
+++ b/tests/lib/OpenMetrics/Exporters/FilesByTypeTest.php
@@ -0,0 +1,27 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2025 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace Test\OpenMetrics\Exporters;
+
+use OC\OpenMetrics\Exporters\FilesByType;
+use OCP\ICacheFactory;
+use OCP\IDBConnection;
+use OCP\OpenMetrics\IMetricFamily;
+use OCP\Server;
+use PHPUnit\Framework\Attributes\Group;
+
+#[Group('DB')]
+class FilesByTypeTest extends ExporterTestCase {
+	protected function getExporter():IMetricFamily {
+		return new FilesByType(
+			Server::get(ICacheFactory::class),
+			Server::get(IDBConnection::class),
+		);
+	}
+}
diff --git a/tests/lib/OpenMetrics/Exporters/InstanceInfoTest.php b/tests/lib/OpenMetrics/Exporters/InstanceInfoTest.php
new file mode 100644
index 0000000000000..d2a0339c16d81
--- /dev/null
+++ b/tests/lib/OpenMetrics/Exporters/InstanceInfoTest.php
@@ -0,0 +1,42 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2025 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace Test\OpenMetrics\Exporters;
+
+use OC\OpenMetrics\Exporters\InstanceInfo;
+use OC\SystemConfig;
+use OCP\OpenMetrics\IMetricFamily;
+use OCP\ServerVersion;
+use PHPUnit\Framework\MockObject\MockObject;
+
+class InstanceInfoTest extends ExporterTestCase {
+	private SystemConfig&MockObject $systemConfig;
+	private ServerVersion&MockObject $serverVersion;
+
+	protected function getExporter():IMetricFamily {
+		$this->systemConfig = $this->createMock(SystemConfig::class);
+		$this->serverVersion = $this->createMock(ServerVersion::class);
+		$this->serverVersion->method('getHumanVersion')->willReturn('33.13.17 Gold');
+		$this->serverVersion->method('getVersion')->willReturn([33, 13, 17]);
+		$this->serverVersion->method('getBuild')->willReturn('dev');
+
+		return new InstanceInfo($this->systemConfig, $this->serverVersion);
+	}
+
+	public function testMetrics(): void {
+		$this->assertCount(1, $this->metrics);
+		$metric = array_pop($this->metrics);
+		$this->assertSame([
+			'full version' => '33.13.17 Gold',
+			'major version' => '33',
+			'build' => 'dev',
+			'installed' => '0',
+		], $metric->labels);
+	}
+}
diff --git a/tests/lib/OpenMetrics/Exporters/MaintenanceTest.php b/tests/lib/OpenMetrics/Exporters/MaintenanceTest.php
new file mode 100644
index 0000000000000..5509c318ecae0
--- /dev/null
+++ b/tests/lib/OpenMetrics/Exporters/MaintenanceTest.php
@@ -0,0 +1,19 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2025 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace Test\OpenMetrics\Exporters;
+
+use OC\OpenMetrics\Exporters\Maintenance;
+use OCP\OpenMetrics\IMetricFamily;
+
+class MaintenanceTest extends ExporterTestCase {
+	protected function getExporter():IMetricFamily {
+		return new Maintenance();
+	}
+}
diff --git a/tests/lib/OpenMetrics/Exporters/RunningJobsTest.php b/tests/lib/OpenMetrics/Exporters/RunningJobsTest.php
new file mode 100644
index 0000000000000..55f6c8fdea065
--- /dev/null
+++ b/tests/lib/OpenMetrics/Exporters/RunningJobsTest.php
@@ -0,0 +1,23 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2025 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace Test\OpenMetrics\Exporters;
+
+use OC\OpenMetrics\Exporters\RunningJobs;
+use OCP\IDBConnection;
+use OCP\OpenMetrics\IMetricFamily;
+use OCP\Server;
+use PHPUnit\Framework\Attributes\Group;
+
+#[Group('DB')]
+class RunningJobsTest extends ExporterTestCase {
+	protected function getExporter():IMetricFamily {
+		return new RunningJobs(Server::get(IDBConnection::class));
+	}
+}
diff --git a/tests/lib/OpenMetrics/Exporters/UsersByBackendTest.php b/tests/lib/OpenMetrics/Exporters/UsersByBackendTest.php
new file mode 100644
index 0000000000000..22d472e6c994f
--- /dev/null
+++ b/tests/lib/OpenMetrics/Exporters/UsersByBackendTest.php
@@ -0,0 +1,39 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2025 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace Test\OpenMetrics\Exporters;
+
+use OC\OpenMetrics\Exporters\UsersByBackend;
+use OCP\IUserManager;
+use OCP\OpenMetrics\IMetricFamily;
+use PHPUnit\Framework\MockObject\MockObject;
+
+class UsersByBackendTest extends ExporterTestCase {
+	private IUserManager&MockObject $userManager;
+	private array $backendList = [
+		'backend A' => 42,
+		'backend B' => 51,
+		'backend C' => 0,
+	];
+
+
+	protected function getExporter():IMetricFamily {
+		$this->userManager = $this->createMock(IUserManager::class);
+		$this->userManager->method('countUsers')
+			->with(true)
+			->willReturn($this->backendList);
+		return new UsersByBackend($this->userManager);
+	}
+
+	public function testMetrics(): void {
+		foreach ($this->metrics as $metric) {
+			$this->assertEquals($this->backendList[$metric->label('backend')], $metric->value);
+		}
+	}
+}