Merging upstream version 1.44.3.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 70 insertions, 0 deletions

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+### Understand the alert
+
+The `btrfs_metadata` alert calculates the percentage of used Btrfs metadata space for a Btrfs filesystem. If you receive this alert, it indicates that your Btrfs filesystem's metadata space is being utilized at a high rate.
+
+### Troubleshoot the alert
+
+**Warning: Data is valuable. Before performing any actions, make sure to take necessary backup steps. Netdata is not responsible for any loss or corruption of data, database, or software.**
+
+1. **Add more physical space**
+
+   - Determine which disk you want to add and in which path:
+     ```
+     root@netdata~ # btrfs device add -f /dev/<new_disk> <path>
+     ```
+
+   - If you get an error that the drive is already mounted, you might have to unmount:
+     ```
+     root@netdata~ # btrfs device add -f /dev/<new_disk> <path>
+     ```
+
+   - Check the newly added disk:
+     ```
+     root@netdata~ # btrfs filesystem show
+     ```
+
+   - Balance the system to make use of the new drive:
+     ```
+     root@netdata~ # btrfs filesystem balance <path>
+     ```
+
+2. **Delete snapshots**
+
+   - List the snapshots for a specific path:
+     ```
+     root@netdata~ # sudo btrfs subvolume list -s <path>
+     ```
+
+   - Delete an unnecessary snapshot:
+     ```
+     root@netdata~ # btrfs subvolume delete <path>/@some_dir-snapshot-test
+     ```
+
+3. **Enable a compression mechanism**
+
+   Apply compression to existing files by modifying the `fstab` configuration file (or during the `mount` procedure) with the `compress=alg` option. Replace `alg` with `zlib`, `lzo`, `zstd`, or `no` (for no compression). For example, to re-compress the `/mount/point` path with `zstd` compression:
+   
+   ```
+   root@netdata # btrfs filesystem defragment -r -v -czstd /mount/point
+   ```
+
+4. **Enable a deduplication mechanism**
+
+   Deduplication tools like duperemove, bees, and dduper can help identify blocks of data sharing common sequences and combine extents via copy-on-write semantics. Ensure you check the status of these 3rd party tools before using them.
+
+   - [duperemove](https://github.com/markfasheh/duperemove)
+   - [bees](https://github.com/Zygo/bees)
+   - [dduper](https://github.com/lakshmipathi/dduper)
+
+5. **Perform a balance**
+
+   Balance data/metadata/system-data in empty or near-empty chunks for Btrfs filesystems with multiple disks, allowing space to be reassigned:
+
+   ```
+   root@netdata # btrfs balance start -musage=50 -dusage=10 -susage=5 /mount/point
+   ```
+
+### Useful resources
+
+1. [The Btrfs filesystem on Arch Linux website](https://wiki.archlinux.org/title/btrfs)
+2. [The Btrfs filesystem on kernel.org website](https://btrfs.wiki.kernel.org)
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