diff --git a/bundles/apt/items.py b/bundles/apt/items.py
index 77d30f6..811d450 100644
--- a/bundles/apt/items.py
+++ b/bundles/apt/items.py
@@ -64,7 +64,8 @@ for host, sources in hosts.items():
         'content': '\n'.join(
             str(source) for source in sorted(sources)
         ).format(
-            release=node.metadata.get('os_release')
+            release=node.metadata.get('os_release'),
+            version=node.os_version[0], # WIP crystal
         ),
         'triggers': {
             'action:apt_update',
diff --git a/bundles/crystal/metadata.py b/bundles/crystal/metadata.py
new file mode 100644
index 0000000..efd513e
--- /dev/null
+++ b/bundles/crystal/metadata.py
@@ -0,0 +1,10 @@
+defaults = {
+    'apt': {
+        'packages': {
+            'crystal': {},
+        },
+        'sources': {
+            'deb http://download.opensuse.org/repositories/devel:/languages:/crystal/Debian_{version}/ /',
+        },
+    },
+}
diff --git a/bundles/telegraf/README.md b/bundles/telegraf/README.md
index 9f74cb6..15db0af 100644
--- a/bundles/telegraf/README.md
+++ b/bundles/telegraf/README.md
@@ -2,3 +2,15 @@
 setfacl -Rm g:telegraf:rX /var/spool/postfix/
 setfacl -dm g:telegraf:rX /var/spool/postfix/
 ```
+
+TODO io
+```bash
+for pid in $(ls /proc | grep '^[0-9]\+$')
+do
+  out=$(cat /proc/$pid/io 2> /dev/null) || continue
+  read="$(echo $out | grep '^read_bytes:' | cut -d' ' -f2)"
+  write="$(echo $out | grep '^write_bytes:' | cut -d' ' -f2)"
+  [ $read = 0 ] && [ $write = 0 ] && continue
+  comm=$(cat /proc/$pid/comm); echo "$comm: $read/$write"
+done
+```
diff --git a/data/apt/keys/download.opensuse.org.asc b/data/apt/keys/download.opensuse.org.asc
new file mode 100644
index 0000000..0130138
--- /dev/null
+++ b/data/apt/keys/download.opensuse.org.asc
@@ -0,0 +1,21 @@
+-----BEGIN PGP PUBLIC KEY BLOCK-----
+Version: GnuPG v2.0.15 (GNU/Linux)
+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+=WWMN
+-----END PGP PUBLIC KEY BLOCK-----
diff --git a/nodes/home.openhab3.py b/nodes/home.openhab3.py
index 10f83ae..7e13842 100644
--- a/nodes/home.openhab3.py
+++ b/nodes/home.openhab3.py
@@ -3,7 +3,7 @@
     'groups': [
         'raspberry-pi',
         'debian-11',
-#        'monitored',
+        'monitored',
         'webserver',
     ],
     'bundles': [
diff --git a/nodes/home.server.py b/nodes/home.server.py
index f67598e..4d57ce1 100644
--- a/nodes/home.server.py
+++ b/nodes/home.server.py
@@ -19,6 +19,7 @@
         'smartctl',
         'wireguard',
         'zfs',
+        'crystal',
     ],
     'metadata': {
         'id': 'af96709e-b13f-4965-a588-ef2cd476437a',