bundles/zfs: run scrub for each pool separately

bundles/zfs/metadata.py

@@ -84,10 +84,6 @@ defaults = {
                 'when': 'weekly',
                 'command': '/usr/local/sbin/zfs-auto-snapshot weekly',
             },
-            'zfs-scrub': {
-                'when': 'Sun 02:00:00 UTC',
-                'command': '/usr/lib/zfs-linux/scrub',
-            }
         },
     },
     'zfs': {
@@ -136,6 +132,23 @@ if node.has_bundle('telegraf'):
     }
 
 
+@metadata_reactor.provides(
+    'systemd-timers/timers/zfs-scrub',
+)
+def scrub_timer(metadata):
+    scrubs = [f'zpool scrub {pool}' for pool in sorted(metadata.get('zfs/pools', {}))]
+    return {
+        'systemd-timers': {
+            'timers': {
+                'zfs-scrub': {
+                    'when': 'Sun 02:00:00 UTC',
+                    'command': scrubs,
+                },
+            },
+        },
+    }
+
+
 @metadata_reactor.provides(
     'icinga2_api/zfs/services',
 )