22141 FIX nimble_volumes: Fix crash on volumes without monitoring data

Jira: CMK-37374
Crash-Group-ID: 4842
Latent-Since: I117714255a44857304c78a59e5c5fa5e042c8549
Change-Id: Ib4e361eef82c98376a4e9caf251d5e76319b08b7

Author: SoloJacobs

.werks/22141.md

@@ -0,0 +1,22 @@
+[//]: # (werk v2)
+# nimble_volumes: Fix crash on volumes without monitoring data
+
+key        | value
+---------- | ---
+date       | 2026-08-07T09:04:47.621844+00:00
+version    | 2.4.0p36
+class      | fix
+edition    | cre
+component  | checks
+level      | 1
+compatible | yes
+
+On some Nimble Storage arrays, the _Volume_ services crashed with
+
+```
+ValueError: invalid literal for int() with base 10: ''
+```
+
+Such arrays list volumes in their SNMP walk that carry no monitoring data at all.
+These volumes are now ignored.
+They are no longer discovered, and services that already exist for them will go stale.

cmk/base/legacy_checks/nimble_volumes.py

@@ -38,7 +38,8 @@ def _check_nimble_volumes(item, params, info, now):
 
 
 def parse_nimble_volumes(string_table: StringTable) -> StringTable:
-    return string_table
+    # Some entries don't contain any monitoring data: CMK-37374
+    return [line for line in string_table if line[2] and line[3] and line[4]]
 
 
 check_info["nimble_volumes"] = LegacyCheckDefinition(

cmk/plugins/collection/checkman/nimble_volumes

@@ -12,4 +12,5 @@ item:
  Name of the volume
 
 discovery:
- One service is created for each volume.
+ One service is created for each volume. Volumes whose SNMP walk contains no
+ size, usage or online data are ignored.

tests/unit/cmk/base/legacy_checks/test_nimble_volumes.py

@@ -3,8 +3,6 @@
 # This file is part of Checkmk (https://checkmk.com). It is subject to the terms and
 # conditions defined in the file COPYING, which is part of this source code package.
 
-import pytest
-
 from tests.unit.checks.checktestlib import mock_item_state
 
 from cmk.base.legacy_checks.nimble_volumes import (
@@ -37,7 +35,6 @@ def test_check_ok_volume() -> None:
     assert ("fs_size", 1073741824, None, None, 0, None) in perfdata
 
 
-@pytest.mark.xfail(strict=True, reason="CMK-37374")
 def test_check_does_not_crash_on_empty_size_values() -> None:
     section = parse_nimble_volumes(STRING_TABLE)
     assert not list(