From 587877e5db99a9bd46ef4485f86da2ed9024e733 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Peter=20=C5=A0urda?= <peter@bitmessage.at>
Date: Fri, 24 Nov 2023 14:04:18 +0800
Subject: [PATCH] Fix missing device name

- now is "missing" instead of an empty string
- this is triggered e.g. when mounting degraded mode. In normal
  operation it shouldn't happen
- Fixes #1
---
 btrfs_plugin.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/btrfs_plugin.py b/btrfs_plugin.py
index b1a2f76..709ad3b 100644
--- a/btrfs_plugin.py
+++ b/btrfs_plugin.py
@@ -22,6 +22,8 @@ def read_callback():
                             r'[^a-zA-Z0-9]',
                             r'-',
                             dev_info.path)[1:]
+                    if not metric.plugin_instance:
+                        metric.plugin_instance = "missing"
                     for counter, value in stats.counters.items():
                         metric.type_instance = counter
                         metric.dispatch(TYPE_STATS, [value], interval=INTERVAL)